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Concrete Casting News from the Hill and Griffith Company

The Influence of Form Release Agent Application to the Quality of Concrete Surfaces

Posted by Hill and Griffith Company on Sep 19, 2019 11:00:54 AM

ACI 318-19 was published in response to new engineering practices and industry changes.

Excerpt from a technical paper by A. Klovas and M. Daukšys 2013 IOP Conf. Ser.: Mater. Sci. Eng. 47 012061.

Introduction

High quality surface finishes are a feature of self-compacting concrete (SCC), but by careful attention to mix design and job site workmanship, nice surfaces with the conventional concrete mixture could be achieved. The appearance of an element mainly depends on: the type of cement and addition used; the mix composition; the quality of the concrete mold and release agent; and the placing procedure. If compared self-compacting concrete with the conventional–the color is generally more uniform. Also, it is easier to avoid defects due to leakage spots at the location of mold joints. Blowholes, honeycombing and other blemishes can be found in all types of concrete but with more fluid concrete mixture it is possible to improve the surface finish. International Council for Building Research has provided guidelines how the concrete may be defined referring the surface quality:

  • ROUGH class – no special requirements for finishing
  • ORDINARY – surface finishing has a minor factor
  • ELABORATE – definite requirements for visual appearance
  • SPECIAL – highest standards for appearance
Concrete Form Release Agents Help Form Removal
photo credit: Bob Sawyer

Formworks are also very important factors for concrete surface quality. Scientist, J. Sousa Coutinho, has researched using two different formworks: controlled permeability (CP) and five-layer wood-based formworks. The results have shown that by using CP formworks, the pore diameter (nm) of concrete surface has decreased up to 50%, porosity – up to 45%, surface hardness (MPa) increased up to 70%, and blow-hole ratio has decreased up to 90 % compared with those concrete surfaces using five-layer wood-based formworks.
 
A number of studies determine how to achieve better consolidation resulting in fewer surface blemishes [7-15]. To minimize the size and number of bug holes and all other effects, the following practices should be followed:
  • Vibration period should be of sufficient duration
  • Vibrator insertions should be properly spaced and overlapped and the vibrator removed slowly
  • Each concrete layer should be consolidated from the bottom upward
  • Vibration periods should be increased on withdrawal when using impermeable forms that permit air trapped at the form surface to escape through joints as between
  • Inward sloping forms and other complex design details should be avoided
  • Vibrator should penetrate into the previous layer;

The main outcome of this research is to evaluate the usage of different form release agent applications on the formwork. In addition, this paper presents a technique which provides:

  1. A method how to evaluate the concrete surface quality using image analysis process;
  2. An evaluation of concrete surfaces quality by the following documents: CIB report no. 24 [4] and GOST 13015.0-83.
  3. A combined method how to evaluate and divide concrete surfaces into special categories provided by CIB report no. 24 GOST 13015.0-83 and “ImageJ” in respect to the area of blemishes.

Read More


 

Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

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We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
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On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
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 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Products, Concrete Casting Supplies, Concrete Safety, Precast Concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, Concrete Form Release Agent

ACI Releases New Building Code Requirements for Structural Concrete

Posted by Hill and Griffith Company on Sep 12, 2019 4:58:19 PM

ACI 318-19 was published in response to new engineering practices and industry changes.

Article excerpt by Jack Moehle published in the Concrete Contractor August/September 2019 issue.

The American Concrete Institute (ACI) published ACI 318-19: “Building Code Requirements for Structural Concrete in July 2019, in response to new engineering practices and industry changes.

ACI 318 presents requirements for design and construction of structural concrete that are necessary to ensure public health and safety. The document is intended for engineers and building officials, but because it addresses materials advancements and applications, it is expected to have an impact on jobsite procedures. It is anticipated the final code requirements of 318-19 will be referenced in the 2021 International Building Code (IBC).

318_19_cover_highres2.5d39ca6a430aa

New Engineering Practices Translate to Changes in the Field

  • ACI was prompted to make updates in the code due to:
    • new technology (computers used for design and analysis by engineers and architects)
    • increased construction of tall buildings
    • the need for seismic resistance
  • New requirements include:
    • minimum reinforcement on interior column-to-slab connections
    • longer bar lengths for thicker, two-way slabs
    • additional transverse reinforcement
  • Updates include
    • expansion of permissible applications of high-strength reinforcement
    • new requirements for material properties of high-strength steels
    • several changes to strut-and-tie method (STM) for design of discontinuity regions
    • clarity on Anchorage-zone reinforcement

New Materials Addressed

  • IBC shotcrete provisions were included
  • Post-installed concrete screw anchors are now recognized

Alternate Cements and Aggregates

  • Now includes provisions for alternate cements and aggregates
  • No details are readily available for these materials because not enough industry testing is available

Read More


More Concrete Contractor News


Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
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Hill and Griffith Customer Service

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On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
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 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Products, Concrete Casting Supplies, Concrete Safety, Precast Concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, Concrete Form Release Agent, Concrete Construction Magazine

Selecting and Using Concrete Release Agents - Excerpt

Posted by Hill and Griffith Company on Sep 6, 2019 5:35:38 PM

Enhance the quality and economy of precast products by using the right release agent

Article excerpt by John A. Koski published in the Concrete Construction March 1994 issue.

Almost every precaster has had a double-tee or an architectural precast panel crack as it was being removed from a form. In some cases, an ineffective or improperly applied release agent may have been the culprit. At other times, the wrong type of release agent may have been used. Knowing how to properly use form release agents and which agent should be used for a particular application can go a long way toward preventing costly mistakes. In addition, following proper procedures and using the right agent can enhance the quality and economy of a finished precast piece.

Less is better with Precast Concrete From Release 3

BASICS OF USE

  • Make sure the release agent you are using is compatible with the form or mold it is being used on. For example, some release agents can cause an adverse chemical reaction when used on foam or rubber forms.
  • Don’t purchase a release agent based on price alone. When examining prices of comparable release agents, compare them based on their cost per square foot of coverage, not by the cost of a 5-gallon pail or 55-gallon drum.
  • Protect form release agents from temperature extremes. Release agents that have frozen and then become liquid again may have had their form release properties altered or destroyed. Extremely high temperatures also can damage the properties of release agents. 
  • Thoroughly mix or agitate release agents that require mixing or agitating. This ensures proper dispersion and continuity of the chemical components within the release agent. Always follow manufacturer recommendations when considering mixing or agitating. Some release agents don’t need to be, or shouldn’t be, mixed or agitated.
  • Make sure workers wear respirators, goggles, face shields, gloves, and other protective clothing as required by the manufacturer and government agencies. Make sure workers are properly trained in all aspects of the application process. This includes not only safety concerns, but also how to properly apply the release agent being used. The application technique workers use, however, may not be appropriate for the new product and can cause it to perform unsatisfactorily or not at all.
  • Before applying the release agent, remove any buildups of concrete, rust, scale, or dirt that may be on the forms.
  • Repair any holes, fractures, or other defects in the forms. Just prior to applying a release agent, make sure that the surfaces of the forms are clean and free of water, dust, dirt, or residues that could be transferred to the surface of the concrete or affect the ability of the release agent to function properly.
  • Make sure that forms are coated uniformly with no gaps, sags, runs, or beads. To avoid these problems, never apply a too-heavy coat. Sags, drips, and runs should be removed as recommended by the manufacturer.
  • Make sure spray equipment is working properly. 
  • Do not over-apply a release agent, especially when using a release agent that is chemically reactive.
  • On new wooden forms, thoroughly saturate the forms according to manufacturer directions before placing concrete.
  • It is best not to wait an excessive amount of time after applying the release agent and before placing concrete as dust and other airborne contaminants can form a light coating over the release agent
  • If the concrete is to be painted, plastered, or have other coatings applied, be sure to use a release agent that won’t prevent the coating from bonding with the concrete.
  • Don’t allow release agents to contact reinforcing steel. Doing so can prevent the concrete from bonding to the reinforcement.

Read More


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Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Products, Concrete Casting Supplies, Concrete Safety, Precast Concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, Concrete Form Release Agent, Concrete Construction Magazine

Please Release Me - Appropriate Use of Concrete Release Agents

Posted by Hill and Griffith Company on Aug 29, 2019 9:24:55 AM

The use of an appropriate release agent, correctly applied, is critical to creating a good, consistent surface quality

by Elaine Toogood

Originally published in the Winter 2018 Issue of Concrete Quarterly.

Applying a release agent to the face of the formwork is like greasing a cake tin. Without it, the formwork cannot easily be removed or released from the hardened concrete.
According to the Concrete Society publication Visual concrete – Planning & Assessment, there are essentially two types of release agent: barrier and reactive. These are further divided into eight categories, though developments in this field mean that some products do not easily fall within these categories.

Not all release agents are suitable for creating visual concrete and selection will be based on many factors, including compatibility with form-facing material, concrete specification and expected site conditions. A good release agent will also help maximize the number of times that a form can be used.

Concrete Form Release Agent

4 Pancras Square by Eric Parry Architects, where the post-tensioned slabs are exposed as soffits. The concrete contractor specified a concrete mold oil release agent for use with the plastic-faced ply lining of the formwork system.

Photo credit: Rory Gardiner

Barrier release agents work by creating a layer between the form face and the concrete. Oils with surfactants are general-purpose release agents for many different types of formwork, including steel, and are often used in the precast industry. None of the other barrier types such as neat oils, mold cream emulsions, water-soluble emulsions and barrier paints are recommended for high-quality finishes. Although barrier paints may be part of a preparatory treatment for timber and plywood before it is first used to extend the life of the formwork.

Most of the reactive types of release agents are suitable for visual concrete and are categorized as chemical release agents, surface retardants and other specialist release agents, including those based on vegetable oil (VERA). They allow the formwork to be struck by creating a very thin layer of unhardened concrete or “soap” on the surface that must be brushed away when the formwork is struck. Chemical release agents are a popular choice but can lead to dusting if over-applied. Although recommended for high-quality finishes, they may not be appropriate for concrete containing silica fume or high amounts of admixtures. VERA fall under the category of other specialist release agents and are recommended for visual concrete, with the added advantage of being non-toxic and biodegradable, and reportedly with a low incidence of blowholes and blemishes.

Design professionals do not need to specify the release agent that is to be used, but rather provide a performance specification. This directs the contractor to select one appropriate for creating high-quality visual concrete surfaces, that has little or no detrimental impact on the appearance of the concrete and that suits the choice of formwork facing and concrete used. Consultation with the manufacturer and form-facing material supplier will be necessary to select the best product and method of application for the specific project. Biodegradable and non-toxic products may also be identified for health and safety reasons.

The selected product or products should then be tested with a full-scale mock-up panel or in a non-critical location of the structure to review the results and trial the method of covering the formwork before final selection. Release agents should be applied in accordance with manufacturers’ guidance – they are often sprayed or applied with a soft brush – to create a thin, uniform and complete coating. Once satisfactory results have been established, the standard of workmanship must be rigorously maintained to ensure consistency. Incorrect application, whether too much or too little, can lead to abrupt color or tone changes in the concrete surface. The surface of the formwork should be cleaned and a coating of release agent applied before every use.

Read More.


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Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Products, Concrete Casting Supplies, Concrete Safety, Precast Concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, Concrete Form Release Agent, Concrete Quarterly

Wood Form Concrete Release Agents

Posted by Hill and Griffith Company on Aug 22, 2019 1:04:51 PM

(This week's post comes from a HOMEGUIDES' article, "How to Keep Concrete From Sticking to Wood." It has a unique perspective from the homebuilder's point of view. You can read the full article here.)

How to Keep Concrete From Sticking to Wood

Concrete-Form-Release-For-Wood.jpgConstruction professionals routinely use plywood panels as shaping forms when pouring concrete for new home foundations. If the wood forms were treated properly with a form release agent, you can easily pull them away after the concrete dries. A do-it-yourselfer can pour concrete between 2-by-4 forms when installing a new sidewalk or patio, but for best results, pretreat the wood in the same way the pros do.

(Caption: Hill and Griffith recommends Grifcote Bio Gold concrete form release for wood. A non-petroleum, non-staining concrete form release that is both VOC compliant and biodegradable.)

Oil-Based Release Agents

At one time, construction professionals would create their own oil-based form release agents using materials such as diesel fuel, home heating oil and mineral oil to keep poured concrete from sticking to wood. Today's homebuilders often select stick-resistant plywood or OSB panels pretreated at the lumber mill with proprietary chemical blends that may include parafin, mineral oil and linseed oil. Some concrete contractors extend the stick-resistant life of the plywood by using a refresher coating of a commercial release agent or a solvent-thinned linseed oil.

Water-Based Barrier Agents

Water-based release agents can also keep concrete from sticking to wood forms, and unlike oil-based formulas, they do so without releasing high levels of volatile organic compounds into the air. VOC-releasing chemicals are highly regulated in some regions because they contribute to atmospheric smog. Commercial water-based release agents are produced from plant-based materials and are less likely to discolor the concrete's surface. Ordinary vegetable oils can serve the same purpose if applied in two or three successive coats.

Reactive Release Agents

Chemically active release agents react with the alkalinity of the concrete to prevent the concrete from sticking to wood molds and forms. Commercial products of this type are formulated with a fatty acid and a soapy surfactant that react chemically with the concrete to help create a clean, unstained concrete surface with a smooth edge. At the same time, they create their own thin chemical membrane that blocks the concrete from infiltrating the wood's pores.


Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete Casting Products, Concrete Casting Supplies, Concrete Safety, Precast Concrete, Grifcote FR 50 Concrete Form Release, Concrete Form Release for Wood, Bio Gold Concrete Form Release, Gricote, Concrete Form Release Agent

Concrete Release Agent Selection for NSF/ANSI 61 Potable Water

Posted by Hill and Griffith Company on May 30, 2019 10:02:33 PM

If you manufacture, sell or distribute water treatment or distribution products in North America, your products are required to comply with NSF/ANSI 61: Drinking Water System Components – Health Effects by most governmental agencies that regulate drinking water supplies.

NSFANSI 61 and Your Concrete Release Agent Selection

Developed by a team of scientists, industry experts and key industry stakeholders, NSF/ANSI 61 sets health effects criteria for many water system components including:

  • Protective barrier materials (cements, paints, coatings)
  • Joining and sealing materials (gaskets, adhesives, lubricants)
  • Mechanical devices (water meters, valves, filters)
  • Pipes and related products (pipe, hose, fittings)
  • Plumbing devices (faucets, drinking fountains)
  • Process media (filter media, ion exchange resins)
  • Non-metallic potable water materials

(From the NSF (National Sanitation Foundation) site.

Benefits of Certification

Certification to NSF/ANSI 61 ensures that your product meets the regulatory requirements for the U.S. and Canada, and it can often meet or fulfill the testing requirements for many other countries as well. Market leaders strive to attain NSF certification as a mark of distinction that provides their customers with assurance that their product is safe for use in drinking water.

NSF/ANSI 61 testing covers all products with drinking water contact from source to tap, and determines what contaminants may migrate or leach from your product into drinking water. It also confirms if they are below the maximum levels allowed to be considered safe.

Certification also allows your company to:

  • List your product in our online directory of certified drinking water system components
  • Use the NSF certification mark on your products and in your promotional materials

Why Work With NSF?

The NSF mark, well respected by public health officials and drinking water utilities, is recognized as a symbol of product quality and integrity. Our responsive, personalized service quickly guides your products through the certification process, ensuring that they get to market on time and on budget. We offer product bracketing services wherever possible to help keep costs down, and we provide pricing up front so there are no hidden surprises down the road.

NSF is accredited by the Standards Council of Canada (SCC) and NSF listings satisfy the requirements of the Canadian National Plumbing Code, U.S. Model Codes and the Uniform Plumbing Code (UPC).

Certification Process

We distinguish ourselves due to our thorough product evaluation, but our certification process is simple and efficient. We assign you a dedicated NSF project manager as a single point of contact to guide you through the certification process and oversee your certification project every step of the way.

Seven Simple Steps to Certification:

  1. Your company submits an application.
  2. You provide product formulation, toxicology and product use information.
  3. Our toxicology department reviews formulations.
  4. We perform a plant audit and sample collection.
  5. Our laboratory conducts testing.
  6. We complete a final toxicology evaluation.
  7. We grant NSF certification for compliant products and you can use the NSF mark on products, packaging and marketing materials.

Our experts can help you reduce overall costs and expedite your time to market by bundling services and reducing the number of contracted service providers and facility audits.

U.S. and Canadian Approvals

Drinking water system components that are used in centralized water treatment plants and water distribution systems up through the water meter are typically regulated by state or provincial drinking water agencies.

Forty-eight U.S. states have legislation, regulations or policies requiring drinking water system components to comply with, or be certified to, NSF/ANSI 61.

Eleven Canadian provinces/territories require drinking water system components to comply with the requirements of NSF/ANSI 61.

Get more information and see a comprehensive map of the U.S. states and Canadian provinces/territories that require NSF/ANSI 61.


For additional information, read these articles published in Precast Inc. by the Hill and Griffith Company:
  • "Biodegradability Redefined and Volatile Organic Compounds Update" by Bob Waterloo, Precast Inc.,
    January/February 2010
    Download Article »

  • Biodegradable, NSF Concrete Form Release Agents Offer a Range of Options for Concrete Applications
    Read More »

Precast Concrete News at NPCA, National Precast Concrete Association

Benchmarking Your Business

Advocating for Infrastructure

Personalize Your Member Experience


Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete, Casting Solutions, Concrete Casting Products, Concrete Casting Supplies, Concrete Casting, Precast Concrete, Concrete Form Release Agent, American Concrete Institute, NSF/ANSI 61 Potable Water

Grifcote® and Cast-O-Magic® Concrete Form Release Agents

Posted by Hill and Griffith Company on May 17, 2019 4:17:55 PM

The Perfect Release

VOC Compliant, NSF Certified* and Biodegradable Release Agents for All Concrete Applications

20190513 HG_1-2pgH_TPR copy

Industry Leading Performance and Quality

Trained technicians are available to visit your site, determine your needs and design the right product for you.

concrete_ties-1
Gricote FR-50 & PR-SS VOC - Workhorse Release


concrete_potable_water-tower-1
Grifcote LV-50 Plus - NSF Certified for Potable Water Release


concrete_bio_gold_form-1
Grifcote Bio-Gold - Environmentally Friendly Release


concrete_junction_form-1
Grifcote CC-150 VOC - Premium Seasoning Agent

form-release-agent-cast-o-magic-sizes-sq
Cast-O-Magic, Con-Solver and Liquid Chisel

consolver-concrete-dissolver-sq
Corrosion Inhibitor for Steel Forms

Nationwide and International Distribution


Precast Concrete News From the National Precast Concrete Association

• NPCA President Search

• Benchmarking Your Business

• Advocating for Infrastructure


Hill and Griffith Customer Service

We're known for our hands-on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete, Casting Solutions, Concrete Casting Products, Concrete Casting Supplies, Concrete Casting, Precast Concrete, Concrete Form Release Agent

Grifcote® LV-50 Plus NSF Approved Potable Water Concrete Form Release Agent

Posted by Hill and Griffith Company on May 10, 2019 4:58:27 PM

Potable Water Concrete Release Agent

Grifcote LV-50 Plus was created specifically for use with castings that would be exposed to potable water.

The material is NSF (ANSI 61) approved for use with potable water and some restrictions do apply in specific applications.

Low VOC and Biodegradable Release Agent

  • All Grifcote products are EPA VOC (Volatile Organic Compound) compliant with less than 250 grams per liter of VOCs. Grifcote is compliant in all 50 States and Canada.

  • All are classified as either readily biodegradable, with a half-life of 28 days or less or inherently biodegradable with a half-life of 60 days or less.

  • All products comply with federal or state regulations regarding concrete release agents.

  • "Biodegradability Redefined and Volatile Organic Compounds Update" by Bob Waterloo, Precast Inc.,
    January/February 2010
    Download Article »

  • Biodegradable, NSF Concrete Form Release Agents Offer a Range of Options for Concrete Applications
    Read More »

If you manufacture, sell or distribute water treatment or distribution products in North America, your products are required to comply with NSF/ANSI 61: Drinking Water System Components – Health Effects by most governmental agencies that regulate drinking water supplies.

NSFANSI 61 and Your Concrete Release Agent Selection

The NSF mark, well respected by public health officials and drinking water utilities, is recognized as a symbol of product quality and integrity. Our responsive, personalized service quickly guides your products through the certification process, ensuring that they get to market on time and on budget. We offer product bracketing services wherever possible to help keep costs down, and we provide pricing up front so there are no hidden surprises down the road.

NSF is accredited by the Standards Council of Canada (SCC) and NSF listings satisfy the requirements of the Canadian National Plumbing Code, U.S. Model Codes and the Uniform Plumbing Code (UPC).

U.S. and Canadian Approvals

Drinking water system components that are used in centralized water treatment plants and water distribution systems up through the water meter are typically regulated by state or provincial drinking water agencies.

Forty-eight U.S. states have legislation, regulations or policies requiring drinking water system components to comply with, or be certified to, NSF/ANSI 61.

Eleven Canadian provinces/territories require drinking water system components to comply with the requirements of NSF/ANSI 61.

Get more information and see a comprehensive map of the U.S. states and Canadian provinces/territories that require NSF/ANSI 61.


For additional information on the proper concrete release agent to use for concrete drinking water tanks, read these articles published in Precast Inc. by the Hill and Griffith Company:

Precast Concrete Water Tank posts by Hill and Griffith in Google

Why Precast Concrete Drinking Water Tanks Are The Best

NPCA extends product-specific certification to water, wastewater tanks 

Why Precast Concrete Cistern pH is Important


Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete, Casting Solutions, Concrete Casting Products, Concrete Casting Supplies, Concrete Casting, Precast Concrete, Concrete Form Release Agent, American Concrete Institute, NSF/ANSI 61 Potable Water, Precast Concrete Drinking Water Tanks

Article review, "The Effects of Concrete Release Agents on the Formwork/Concrete Interface"

Posted by Hill and Griffith Company on May 3, 2019 2:11:59 PM

Fédération Internationale du Béton Proceedings of the 2nd International Congress June 5-8, 2006 – Naples, Italy

Effects of Concrete Release Agents 1

INTRODUCTION

The role of demoulding oils is to prevent the concrete adhering to the steel walls [1]. Because of its extremely fine structure and high lubricity at the very beginning of casting, the cement paste contained in the concrete spreads over the formwork surface and builds up in the asperities. The adhesion of the oil is therefore an important parameter. Another feature of these oils is that they improve the appearance of the facings and the resistance to corrosion of the surfaces of the steel mould and formwork.

This article is by:

Libessart, L., Djelal, C.
Laboratoire d’Artois Mécanique Thermique et Instrumentation, Unviversité d’Artois, TechnoParc Futura – 62400 Béthune, France

De Caro, P.
Laboratoire de Chmie Agro-industriel, UMR1010, INA/INP, ENSIACET, 118 route de Narbonne – 31077 Toulouse Cedex

Dubois, I.
CHRYSO S.A., ZI - 7 rue de l’Europe – 45300 Sermaises

###

Highlights:

Currently the most popular demoulding oils are of mineral origin. However, these products are not very environmentally friendly and cause inconvenience to the users (skin and respiratory tract irritations, inhalation of volatile organic components). Prolonged exposure can inflict irreversible damage recognized as occupational diseases. To resolve these problems, vegetable-based formulations have been developed. A European study [2] was conducted in 1999 to make these agents better known in the building world (SUMOREVA project).

A lack of knowledge of the mechanisms acting at the concrete/wall interface, when demoulding agents are present, means that the formulation of these lubricants remains totally empirical. Manufacturers can but fall back on their experience and site tests which are restrictive and expensive, in order to establish a formulation which best meets users’ requirements.

The aim of this study is to link the physical-chemical properties of mineral or vegetable oil compositions to their mechanical properties when the concrete is laid. Keywords: concrete, release agents, interface, formwork

ESTABLISHING THE CHARACTERISTICS OF THE OILS

The study was conducted on one formulation of mineral origin and one formulation of vegetable origin. The properties of the oils are given in Tab. 1:

The mineral composition comprises a mineral base of paraffin origin. The vegetable composition is formulated from a complex plant ester and an acidifier.

The acid index corresponds to the number of milligrams of potassium (KOH) required to neutralise a gram of oil. In our case, the acid index enables the content to be quantified in COOH carboxylic functions. These functions correspond to free acids, i.e. non saponified. The complex plant esters are prepared by sterification from a fatty acid of plant origin.

Effects of Concrete Release Agents 2

Tab. 1. Properties of the oils

The fatty acids (Fig.1) in contact with an alkaline hydroxide (in this case, lime) are transformed into alkaline carboxylates (soaps). They also catalyse the saponification reaction which generates soaps from an ester and an alkaline hydroxide. In this case, the soap obtained is a calcium salt 2(RCOO)Ca2+. A soap is formed from a long carbonated chain (R) and a carboxylate group (–COO-) called polar head.

 

CHARACTERISTICS OF THE OIL FILM

The demoulding agent must be chosen in relation to the nature of the formwork and the period of use [4], but it is mainly the conditions of application which are the determining factor. Each time a demoulding agent is used, the formwork surfaces must first be thoroughly cleaned. In addition, the demoulding agent must be applied in a fine and continuous film. It is imperative for the demoulding product to cling to the formwork because if it rides up with the concrete during filling, it may cause flaws and air bubbles. A study conducted by a North American demoulding manufacturer shows that the thicker the oil, the more the surface quality of the concrete deteriorates. According to this study, the best results are obtained with a thickness of 10 μm [5].
 
The optimum quantities for mineral-based oils vary from 0.12 to 0.15 litre per m2 [6] and are about 5 to 10 times lower for vegetable-based oils [7]. This is explained by the fact that in the case of vegetable-based oils, the thinner the film, the better it is organized, and consequently its effectiveness is improved. Excessive oil disorganizes the film and impairs its effectiveness.
 
The most suitable application method is spraying, in some cases together with spreading by rubber scraper to remove the excess oil from the single layer.
 
The quality of the oil film was evaluated on the basis of wettability and under an optical microscope.
 
CONCLUSION
 
The mineral oil studied has low viscosity and a good rheological resistance to temperature variations. Moreover, it also has high wettability. Despite these favorable characteristics, more oil has to be sprayed to obtain an even film on the formwork surface. Vegetable oil has a higher viscosity and lower wettability than mineral oil. In addition, at temperatures of below 20°C, its viscosity increases considerably, and this change is detrimental to the application of the oil under winter conditions. On the other hand, its film offers a homogeneous appearance for a small volume of sprayed oil. The friction of the concrete on the formwork is also reduced for vegetable oil because of an organized soap/oil structure at the interface. It is a combination between a chemical effect (saponification reaction) and a physical effect (thickness of the film) which leads to a significant reduction in the friction stresses.
 

ABSTRACT

Release agents are significant source of pollution in the construction and prefabrication industries. Conventional product are known to be toxic for humans and the environment. New formulations based on vegetable esters have appeared on the market to mitigate against this drawback, but more knowledge must be required about the properties and behaviour of these products, and their industry profile is raised. Understanding the phenomena that occur over formwork-oil-concrete interface is a real challenge. This paper begins with a physicochemical survey of release agents by defining the formwork-oil and oil-concrete interfaces. In then characterizes the formwork-oil-concrete interfaces by dynamic studies (tribometer). Physicochemical mechanisms are proposed.


Precast Structural Concrete Reports from International Federation for Structural Concrete

Ductility of Reinforced Concrete Structures

Practical Design of Structural Concrete

Design of Post-Tensioned Slabs and Foundations


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 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete, Casting Solutions, Concrete Casting Products, Concrete Casting Supplies, Concrete Casting, Precast Concrete, Concrete Form Release Agent, International Federation for Structural Concrete

Why Precast Concrete Drinking Water Tanks Are The Best

Posted by Hill and Griffith Company on Apr 25, 2019 4:55:38 PM

Why you should only use a concrete tank to store drinking water

Any water that is stationary will eventually become stagnant and undrinkable. How water is stored and its temperature will determine how long the water stays healthy and drinkable. Spring water is often considered as the best water you can drink, store your water in an underground concrete tank and you are producing your own spring water.

Precast Concrete Drinking Water Tanks
Image from Colorado Precast Concrete.

Why tank water is so acidic

Underground concrete tanks is normally roof harvested rain water, which is naturally acidic. The acidity of normal rain is attributed mainly to carbon dioxide in the atmosphere which gets absorbed as water condenses from a gas to a liquid and it is these liquid droplets that forms clouds and eventually rain. Even in areas that are minimally affected by human pollution, the pH of rain water can range from 4.5 to 5.0 which is fairly acidic.

In built-up areas around cities, above normal acid rain is generally caused by human pollution and in highly polluted cities rain water can become as acidic as lemon juice which causes lots of problems for old historic buildings.

This acidity forms part of the natural process that allows rain water, with the help of microbes found in the soil, to dissolve minerals from the soil into a colloidal form that now makes the water neutral and full of minerals which can then be taken up by plants. Acidic water is however not choosy and will happily do the same thing in the human body. Resulting in the stealing of alkalizing minerals and therefore a net loss of these vital minerals from the body as the water attempts to achieve a more neutral pH balance.

Precast Concrete Potable Water Tanks

Why is concrete the best material to store water in

The very nature of water itself is that it wants to balance out to a neutral pH. and a concrete tank is the only man made storage system that will allow this to happen. To neutralize itself, water will absorb some of the minerals out of the concrete and will generally settle in a slightly alkaline state.

An in-ground concrete water tank will keep the water at the temperature that it fell out of the sky at and if you are in an area that gets mostly winter rain, that cold water will remain cold all summer.

Even above ground, light cannot penetrate through the concrete walls of a concrete and into the water.

All of this become very important, because roof harvested rain water picks up all sorts of dust, bacteria, and bugs and even after being pre-filtered some always gets through.

Water that is alkaline, cold and removed from light will not support the growth of any bacteria that makes its way into your tank, thus allowing this water to stay clean and drinkable for years.

If you cannot put your tank underground, paint it white; or allow ivy to cover it to keep the sun off it and the water will stay very cold.

Yes in time, this leaching of minerals will compromise the integrity of a concrete tank, but a well-made tank is good for a hundred odd years.

(Thanks to Versatile Tanks for this article)


If you manufacture, sell or distribute water treatment or distribution products in North America, your products are required to comply with NSF/ANSI 61: Drinking Water System Components – Health Effects by most governmental agencies that regulate drinking water supplies.

NSFANSI 61 and Your Concrete Release Agent Selection

The NSF mark, well respected by public health officials and drinking water utilities, is recognized as a symbol of product quality and integrity. Our responsive, personalized service quickly guides your products through the certification process, ensuring that they get to market on time and on budget. We offer product bracketing services wherever possible to help keep costs down, and we provide pricing up front so there are no hidden surprises down the road.

NSF is accredited by the Standards Council of Canada (SCC) and NSF listings satisfy the requirements of the Canadian National Plumbing Code, U.S. Model Codes and the Uniform Plumbing Code (UPC).

U.S. and Canadian Approvals

Drinking water system components that are used in centralized water treatment plants and water distribution systems up through the water meter are typically regulated by state or provincial drinking water agencies.

Forty-eight U.S. states have legislation, regulations or policies requiring drinking water system components to comply with, or be certified to, NSF/ANSI 61.

Eleven Canadian provinces/territories require drinking water system components to comply with the requirements of NSF/ANSI 61.

Get more information and see a comprehensive map of the U.S. states and Canadian provinces/territories that require NSF/ANSI 61.


For additional information on the proper concrete release agent to use for concrete drinking water tanks, read these articles published in Precast Inc. by the Hill and Griffith Company:

Precast Concrete Water Tank posts by Hill and Griffith in Google

Why Precast Concrete Drinking Water Tanks Are The Best

NPCA extends product-specific certification to water, wastewater tanks 

Why Precast Concrete Cistern pH is Important


Hill and Griffith Customer Service

We're known for our hands on approach. Let us visit your plant and recommend concrete release agents, packerhead concrete form releases, concrete form seasoning, potable water concrete form release, non-petroleum concrete form release, biodegradable concrete form release, rust inhibitors and concrete dissolver products that suit your needs.

Hill and Griffith Samples

Product Samples

We are pleased to provide samples in quantities large enough to allow you to "try before you buy."
Contact Us »

 

Hill and Griffith Customer Service

Technical Services & Support

On-site casting defect investigations, product testing, machine start-ups and much more. Also, lab facilities are available to provide testing upon request.
Contact Us »

 

 Bulletins and Technical Papers for Concrete Casting Products

Tags: Concrete, Casting Solutions, Concrete Casting Products, Concrete Casting Supplies, Concrete Casting, Precast Concrete, Concrete Form Release Agent, American Concrete Institute, NSF/ANSI 61 Potable Water, Precast Concrete Drinking Water Tanks

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