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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.

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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


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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.

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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.

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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.

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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.

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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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Article Review: Concrete Formed Surface Classifications & Specifications

Posted by Hill and Griffith Company on Jul 18, 2019 1:06:30 PM

Details on classifications & specifications for surface finishes

An excerpt from the July/August 2019 issue of Precast Inc., by Eric Carleton, P.E., NPCA's director of codes and standards.

Evaluating_and_Diagnosing_Concrete_Formed_Surface_Imperfections

Less is better when spraying concrete form release agents on concrete forms.

In 1975, the International Council for Building Research established a general classification of formed surfaces which is referenced in the most recent edition of ACI 301.2R, "Identification and Control of Visible Effects of Consolidation on Formed Concrete Surfaces."

Those classifications are:

  1. Rough - No special requirements for finishing
  2. Ordinary - surface finishing has a minor factor
  3. Elaborate - definite requirements for visual appearance
  4. Special - highest standards for appearance [considered architectural]

Within ACI 347R-14, "Guide to Formwork for Concrete," there is a similar class system to differentiate concrete surface evaluation based on application:

  1. Class D - minimum quality requirement for surfaces where roughness is not objectionable, usually applied where surfaces will be permanently concealed.
  2. Class C - general standard for permanently exposed surfaces where other finishes are not specified
  3. Class B - intended for coarse-textured, concrete form surfaces intended to receive plaster, stucco or wainscoting
  4. Class A - suggested for surfaces prominently exposed to public view where appearance is of special importance

ACI 301-16, "Specifications for Structural Concrete," provides more detailed information.

5.3.3.3(a) Surface finish-1.0 (SF-1.0):

  • No formwork facing material is specified
  • Patch voids larger than 1-1/2-inch wide or 1/2-inch deep
  • Remove projections larger than 1 inch
  • Tie holes need not be patched
  • Surface tolerance Class D as specified in ACI 117-10, "Specification for Tolerances for Concrete Construction and Materials and Commentary."
  • Mockup not required

5.3.3.3(b) Surface finish-2.0 (SF-2.0):

  • Patch voids larger than 3/4-inch wide or 1/2-inch deep
  • Remove projections larger than 1/4 inch
  • Patch Tie holes
  • Surface tolerance Class B as specified in ACI 117
  • Unless otherwise specified, provide mockup of concrete surface appearance and texture

5.3.3.3(c) Surface finish-3.0 (SF-3.0):

  • Patch voids larger than 3/4-inch wide or 1/2-inch deep
  • Remove projections larger than 1/8 inch
  • Patch Tie holes
  • Surface tolerance Class A as specified in ACI 117
  • Provide mockup of concrete surface appearance and texture

5.3.3.5 Unspecified as - cast-finishes - if a surface finish is not specified, provide the following finishes:

  • SF-1.0 on concrete surfaces not exposed to view
  • SF-2.0 on concrete surfaces exposed to view

For the full article, please visit the Precast.org site.


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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Article Review: Evaluating and Diagnosing Formed Surface Imperfections

Posted by Hill and Griffith Company on Jul 11, 2019 4:18:57 PM

Precast formed concrete surface problems and how to identify and correct them

An excerpt from of the article found in the July/August 2019 issue of Precast Inc., by Eric Carleton, P.E., NPCA's director of codes and standards.

Evaluating_and_Diagnosing_Concrete_Formed_Surface_Imperfections

Less is better when spraying concrete form release agents on concrete forms.

Green Bay Packers Coach Vince Lombardi said, “Perfection is not attainable, but if we chase perfection, we can catch excellence.” Precast manufacturers try to make perfect products, but like most things, attaining complete perfection is elusive if not impossible. While the goal is to attain perfection, precasters recognize the economic and production realities that some product irregularities will occur. The goal is to mitigate imperfections while still maintaining tolerances and meeting owners’ expectations.

For (precast) formed concrete surfaces, many problems can be narrowed down to three practices: consolidation or vibration, form set up and maintenance, and form oil/release agent application.

Common issues:

  1. Bugholes
    1. Poor or improper concrete consolidation
    2. Excessive application of form release oil or agent
  2. Honeycombing
  3. Cracking
  4. Fins
  5. Form Bleed
  6. Poor Form Fit
  7. Sand Streaking
  8. Layering Marks
  9. Cold Joint
  10. Staining
  11. Color Continuity

Regardless of the end use, a well-cast product, free of formed surface irregularities, provides an excellent representation of a quality operation.

For the full article, please visit the Precast.org site.


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 Release Agents, Concrete Casting Supplies, Precast Concrete, Gricote, Precast Inc Magazine

Employees drive safety and product quality in American precast concrete pipe plants

Posted by Hill and Griffith Company on Jul 5, 2019 3:25:38 PM

Producer members of the American Concrete Pipe Associa­tion empower their employees to introduce new ways to elevate the safety of workspaces and improve product quality.

As published in the March 2019 issue of CONCRETE PLANT INTERNATIONAL, by Russell Tripp, P.E., President, American Concrete Pipe Association, USA

Qualtity Precast Concrete Pipe 2

The O-ring guard developed by Forterra Pipe and Precast (Lorena Texas Plant) improves control when installing or removing O-rings following production

Each year, employees and their companies are celebrated at the ACPA's Pipe School/Pipe Show with safety and quality awards. At the 2019 Pipe School/Pipe Show, top awards were presented for a clip gun guard; O-ring snap band guard/remover; visual job task analysis; batch plant operator training, product tags, and a lift hole spreader. The Chairman's Safety Award recognizes plants and/or companies that have implemented successful safety initiatives that result in a safer and more productive workplace. The Chairman's Quality Award recognizes member plants and/or com­panies that have implemented successful innovations result­ing in higher quality products and more efficient production processes. 

Chairman's Safety Award - Company-Wide
Winner of the 2018 Chairman's Safety award was Rinker Materials - Dallas, TX for the Clip Gun Guard. The guard devel­oped after several employee's received injuries to hands and fingers when using the tool. Development of the guard in­cluded the manufacturer of the clip gun and plant personnel. The Clip Gun Guard is now used at all Rinker Facilities and a safety feature for the manufacturer.

Chairman's Safety Award - Equipment-Related - O-Ring Guard
O-ring snap bands, that can be very large in diameter, are no­torious for their uncontrolled springing action. When they are removed, they are awkward and can spring in many direc­tions. The O-ring guard developed by Forterra Pipe and Pre­cast (Lorena Texas Plant) improves control when installing or removing O-rings following production.

Chairman's Safety Award - Individual Facility - Visual Job Task Analysis (JTA)
JTA is a very difficult system to incorporate in heavy manufac­turing. There are many activities occurring simultaneously. The visual JTA introduced by Rinker Materials - Pipe Division (Cor­porate) uses a tablet to allow leaders to easily access video of safe processes in the work area and provide training to new or transferred employees. Documenting training for Job Task Analysis is digital and accessible.

Qualtity Precast Concrete Pipe 3

The Clip Gun Guard was developed after several employees received injuries to hands and fingers when using the tool.

Chairman's Quality Award - Company-Wide Best Practice - Batch Plant Operator Training
Production of high-quality products begin with batch plant operators. The company-wide quality goal of Rinker Materials - Pipe Division (Corporate) is to achieve a "Batch Plant Oper­ator Training Certificate." Training provides further under­standing of the batching system features. Batch Plant Training also serves to train backup operator(s) at each plant who pos­sess a much stronger understanding of the control system and "concrete science."

Chairman's Quality Award - Company-Innovation (Product Tags)
Northern Concrete Pipe, Inc. was looking for a way to ensure that cages produced in advance of production would be used for the correct project and/or product. The company wanted to be certain that any reinforcing that is unique is easily iden­tifiable, and to ensure that no reinforcement cages would be placed into production before inspection and release by qual­ity control personnel.

Product tags are now fastened to pre-assembled reinforcing cages and color coded when reinforcing is unique, such as, when a cage has a block out, anchors, no spigot, or is pro­duced to a specific lay length. The information on the tags en­sures that when reinforcing cages are produced for similar projects or products, the reinforcing will not get mixed. Ac­countability and the ability to track repeat mistakes and pro­vide training is assured when the person that assembled the reinforcing signs the ticket. Tags eliminate cages from being placed into production without pre-pour inspection. Color coding makes everyone aware that reinforcing is unique and what is unique about it.

Chairman's Quality Award - Individual Plant Process Improvement - Lift Hole Spreader
Lift holes in heavily reinforced products are challenging to place. Northern Concrete Pipe, Inc. does not allow the use of torches on cages and wanted a better way to keep cages specified without sacrificing safety or increasing employee ex­ertion. The lift hole spreader accurately places lift hole openings in reinforcement cages and eliminates wire showing in lift holes while reducing worker stress. By eliminating exposed wire in lift holes, contractors use their lifting apparatus correctly and efficiently. This innovation reduces the chance for leakage around exposed wires to penetrate the wall of the product.

QCast Plant Certification Program
Both the safety and quality awards are reinforced by the ACPA's QCast Plant Certification Program, which is the recog­nized standard for quality assurance in America's concrete pipe industry. Plants may be certified in storm sewer and cul­vert pipe, sanitary sewer, box culverts, three-sided structures, manholes, and precast structures.

Qualtity Precast Concrete Pipe 1


QCast is a voluntary program to continue the advancement of quality in the precast concrete pipe and products industry. Each year the manual for the program is reviewed and when necessary updated to accommodate industry-wide standards revisions, and changes in production technology. The manual requires that management ensure that the supervisory and production personnel immediately responsible for product quality are properly trained. The training results in innovation in safety and quality that is recognized industry-wide.

The safety and quality awards, and the QCast program are el­ements of the ACPA's Quality School held each year at the be­ginning of the heavy production season. The 4-day school is attended by veteran employees and new hires alike. Employ­ers encourage their production staff to attend and return to their workplaces with certificates attesting to their compe­tence in modern production techniques, reinforcement, con­crete mixing, batching and transport, self-consolidating con­crete, consolidation, pre and post-pour inspection, curing and fundamental calculations.

The high quality of concrete pipe and the production facilities of member companies are represented by ACPA's safety and quality awards, QCast certification program and Quality School. But it is the friendly competition between members for the awards, and then sharing the knowledge associated with the entries that result in safe workplaces and greater ef­ficiencies in production. There is no doubt that the Chairman's Safety Award and Chairman's Quality Award drive innovation that is characteristic of the concrete pipe plants of ACPA's pro­ducer members.

American Concrete Pipe Association
8445 Freeport Parkway, Suite 350, Irving, Texas 75063-2595, USA T +1 972-506-7216, F +1 972-506-7682
info@concretepipe.org
rtripp@concretepipe.org
www.concretepipe.org


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

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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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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 Release Agents, Concrete Casting Supplies, Precast Concrete, Gricote, Concrete Plant International Magazine

More is Better in Baseball - Less Release Agent is Better in Precast Concrete

Posted by Hill and Griffith Company on Jun 28, 2019 5:27:07 PM

The Perfect Release with Grifcote concrete form release agents that are readily and inherently biodegradable.

Less is better with Precast Concrete From Release 4

Grifcote® products are the most widely used concrete form release agents in the United States, Canada and Puerto Rico.

All release agents are easily sprayed, swabbed or wiped.

More Beer is Better - Less Release Agent is Better with Precast Concrete

Less is better with Precast Concrete From Release 3

Gifcote products are non-staining and ready to use with no mixing needed and offer many unique features to improve concrete separation from forms, pallets and molds.

Grifcote carries a non-flammable/noncombustible rating and is considered DOT hazardous material exempt. Drivers DO NOT need to be HM 126 or use placards. We’ve engineered Grifcote products to have low odor and flash points above 260 degrees Fahrenheit to keep workers safe.

Grifcote is chemically formulated to help reduce the formation of bug holes. Reactive fatty acid/methyl esters react with free lime. The reactive ingredients in Grifcote creates a metallic soap that eases separation from the form.

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

More Speed is Better on the Lake - Less is Better in Precast Concrete Release Agent

Less is better with Precast Concrete From Release 1

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

Grifcote is EPA VOC compliant. With less than 250 grams per liter of Volatile Organic Compounds Grifcote is compliant in all 50 States and Canada.

Spraying form release agents on mixers and equip-ment reduces labor and cleanup at the end of the day eliminating concrete adhering to the equipment.

Coverage rates are determined by the person applying the material and the low viscosity of Grifcote. In all cases, the “Thinner is better” concept applies for maximum coverage and best release and finish.

You can purchase Grifcote products in drums, 300-gallon totes or bulk tanks. Grifcote has indefinite freeze/thaw cycles. You don’t need to worry about Grifcote degradation due to temperature changes.

FR-50-VOC is the work horse for the concrete industry.

More Speed is Better in Racing - Less is Better in Precast Concrete Release Agent Application

Less is better with Precast Concrete From Release 2

Grifcote form release agents are designed for specific industry applications including: precast, pipe, burial vault, prestressed and other similar applications.

PR-SS-VOC is designed for Packerhead pipe operations and those really tough release jobs. Give us your toughest release challenge and we’ll recommend an economical solution. 

CC-150-VOC is used to season concrete forms for the best release.

The Hill and Griffith Company works closely with pipe and form equipment manufactures to provide optimum release characteristics.

LV-50 Plus was created specifically for use with potable water and for seasoning forms. It is NSF (ANSI 61) approved for use with potable water with some restrictions in specific applications.

 

Happy Fourth of July week!


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 Release Agents, Concrete Casting Supplies, Precast Concrete, Gricote

Review: "Guide for Surface Finish of Formed Concrete"

Posted by Hill and Griffith Company on Dec 6, 2018 1:05:46 PM

(This week's post is a review of the American Society of Concrete Construction's "Guide for Surface Finish of Formed Concrete." You can read it at Google Books here.)

Amazon Book's summary (April 1, 1999), "Exactly what is a smooth-form finish? What is a rough-form finish? To what extent are bugholes, voids and fins acceptable in each type? This easy-to-use guide explains and illustrates the answers to these questions and, even more importantly, serves as the standard for the differences between as-cast structural concrete finishes. The succinct, yet thorough, text includes a glossary and a handy table on as-cast finishes. But the guide's Presentation Photos are what make it truly unique. Three sets of 6 different, full-scale photographs depict various as-cast finishes, with bugholes and voids ranging from 1/16" or less to 2" across. Attach a Presentation Photo to a bid or specification to show what surface finish is to be expected."

Surface Finish of Formed Concrete.jpg 

 

(Jan 1, 2005 edition from Google Books)

Form Release Agents

Release agents are differentiated from form coatings or sealers that are usually applied in liquid form to contact surfaces either during manufacture or in the field. Coatings and sealers serve one or more of the following purposes:

  • Alter the texture of the contact surface 
  • Improve the durability of the contact surface
  • protect the contact surface from moisture

Release agents, on the other hand, are applied to the contact surface of the forms to prevent bond to the concrete and thus facilitate stripping. They can be applied to form materials during manufacture or applied to the form before each use. Manufacturers' recommendations should be followed in the use of coatings, sealers, and release agents (Reference 10-11), but ACI 347 recommends independent investigation of performance before using a new product.

There is no ACI standard to define these products, but the term form oil is frequently applied to petroleum compounds originally intended for other applications such as diesel fuel or heating oil, while release agent more often refers to products containing proprietary reactive ingredients specifically formulated for use on concrete forms. Release agents are commonly classified on the basis of how they act instead of what is in them. The two basic categories are barrier agents and chemically active agents, sometimes called reactive agents. Some release agents are a combination of the two types.

Barrier type releases agents create a physical barrier between the form surface and the fresh concrete, preventing the concrete from sticking to the form. Familiar examples are home heating oil, diesel oil, and used motor oil. U.S. environmental regulations prohibit the sale of these commodities as release agents, but they have been widely used because they are inexpensive and readily available. They are applied in relatively thick films, covering 200 to 600 sq ft per gallon, and such heavy applications can increase surface staining and bugholes on the concrete surface. If coated forms are left for several days before concrete is placed, barrier oils may evaporate, possibly leading to some sticking of the concrete to the form.

Chemically active or reactive agents contain an active ingredient that may be dissolver in an oil-based carrier or emulsified in a water-based carrier. The active ingredient is typically some type of fatty acid derived from plant or animal sources, and it combines chemically with calcium ions in the fresh concrete. The reaction product is a thin layer of what chemists refer to as a grease or metallic soap or salt; non-water-soluble, it permits the form to release readily from the hardened concrete.

The reactive fatty acid components are generally considered biodegradable and have found favor in the past decade because of increasingly stringent environmental regulations. For similar reasons, manufacturers have also been turning to water-based carriers, which will probably be subject to freezing.

 


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, Concrete Safety, Precast Concrete, Bio Gold Concrete Form Release, Gricote, Concrete Form Release Agent

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