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Concrete Casting News from the Hill and Griffith Company

NPCA extends product-specific certification to water, wastewater tanks

Posted by Hill and Griffith Company on Oct 18, 2018 12:42:09 PM

The National Precast Concrete Association takes quality control and validation to the next level with a new product-focused certification for water and wastewater tanks.

NPCA Certified Water Tank

Water or wastewater tanks fabricated by Listed Product participants will soon have an additional quality assurance marking to accompany NPCA Certified Plant. Photo and article from Sept. 2018 Concrete Products Magazine.

While its Plant Certification program has traditionally centered on precast concrete production processes candidate operations must abide, the just-launched Optional Product Listing for Water and Wastewater Tanks Program describes specific product models, plus design and performance criteria to obtain certification. Like other association programs, the new offering enlists independent third-party engineering firms accredited to ISO/IEC 17020:2012 for Plant Inspection.

All NPCA Certified Plants can participate in the water and wastewater tank program by completing a detailed submittal package for the model(s) they wish to list. The submittal includes plant information; product description indicating tank capacity and model number; complete set of drawings; plus, reinforcing details and structural calculations. Documents must bear structural or professional engineer stamp. Once the submittal is approved, the plant undergoes an unannounced inspection that includes a watertightness test on a tank chosen at random. The plant will be granted a product listing based on successful test completion. Listed products will appear on the NPCA site, www.precast.org, below the producer name, and with plant product schedule.

Just as Plant Certification enables quality-conscious agencies, engineers and specifiers to identify and select premier precast concrete producers, NPCA notes, the Product Listing Program takes certification one step farther to include specific water or wastewater tank models. Plants displaying the NPCA Certified Plant and NPCA Listed Product markings on their tanks underscore processes complying with industry, design and performance standards. The certification and listing programs reflect NPCA’s commitment to assisting members with maintaining excellence in precast production and operations. By setting one standard of quality, they level the playing field for all producers pursuing market segments or individual contracts.

Additional information on Plant Certification and Listed Products can be obtained from NPCA Director of Certification and Regulator Services Richard Kolewski, 800/366-7731. 


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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 and non-petroleum concrete form release, biodegradable releases, 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 Form Release Agent, Concrete Casting Supplies, NPCA Convention, Potable Water Tanks, Precast Concrete Drinking Water Tanks

NSF Concrete Form Release Agent Evaluation

Posted by Hill and Griffith Company on Jul 27, 2018 12:40:14 PM

Concrete additives or release agents that contain contaminants, can cause compliance problems for the municipal drinking water utility and present potential health risks to the consumer.

Overview

 

Drinking water contaminants can come from many sources, including the equipment used for water storage and transportation. Concrete used in large storage tanks, reservoirs and pipelines is usually a combination of cement, admixtures, curing compound, sand and gravel. It can also contain fly ash and other additives to strengthen the concrete and increase its durability. However, any of these additives can have contaminants that can cause compliance problems for the utility and present potential health risks to the consumer. If any of these additives can have contaminants that can cause compliance problems for the utility and present potential health risks to the consumer.
 
NSF Certified Form Release
 
 

The following are excerpts pertaining to release agents.
 
5 Barrier materials
 
5.1 Scope 
 
The requirements of this section apply to products and materials intended to form a barrier providing containment of drinking water or to prevent drinking water contact with another surface. The products and materials that are covered include, but are not limited to: coatings and paints applied to fittings, pipes, mechanical devices and non residential storage tanks, linings, liners, bladders and diaphragms, and constituents of concrete and cement-mortar (e.g., Portland and blended hydraulic cements, admixtures, sealers, and mold release agents. These products and materials can be field-applied, factory applied, precast, or cast in place.
 
5.2 Definitions
 
5.2.10 form/mold release agent: A material applied to the inside of a form or mold used to cast concrete or cement-mortar, which prevents adhesion of the concrete or cement-mortar to its surface. 
 
5.5 Extraction Procedures
 
5.5.2.4 Products requiring cement mortar cubes
 
Test sample mortar cubes shall be prepared in accordance to the applicable sections of ASTM C 109. Mix water shall meet reagent water requirements (see Annex B, section B.9.2.1 ). Sand shall be washed in accordance with the procedures in ASTM C 778. Mixing tools and other items coming into contact with the mortar shall be washed with soap and water, rinsed with tap water, rinsed with reagent water, and rinsed with isopropyl alcohol. The mortar shall be placed in polyethylene or polypropylene lined molds; no form release agents shall be used. Specimens shall be removed from the molds after 24 h and placed in glass or polyethylene beakers and covered with an inverted watch glass supported on glass Rebel hooks (or other devices to prevent air seal of the vessel) and placed for 28 d ± 12 h, or fewer as specified by the manufacturer, in a moist cabinet meeting the requirements of ASTM C 511. The specimens shall be removed from the moist cabinet and air dried at 23 ± 2 °C (73 ± 4 °F) and 50 ± 5% relative humidity for 7 d. 
 
5.5.2.4.4 Form and mold release agents
 
These products shall be applied per manufacturer specifications to the mold used during the preparation of the test cubes (see 5.5.2.4 ). 
 
5.5.4 Conditioning (optional)
 
Test samples shall be conditioned immediately after curing. This conditioning procedure simulates the disinfection of water mains and storage tanks prior to placing into service, and is based on AWWA Standards C651-05 and C652-02. Coatings intended for pipes and fittings can be conditioned as follows:
1) prepare 50 mg/L free available chlorine solution using sodium hypochlorite (NaOCI - reagent grade or equivalent);
2) using a spray bottle, spray the previously rinsed test samples, wetting all surfaces to be exposed;
3) let the test samples stand for at least 3 hours; and
4) place the test samples in racks, rinse with cold tap water, and rinse with reagent water, meeting the requirements of Annex B, section B.9.2.1.
 
5.5.5 Exposure protocols
 
For all test samples, exposure shall commence immediately following the conditioning step. If immediate exposure is not possible, the test samples shall be dried in a laminar flow hood and exposed within 4 h. Successful evaluation at an elevated exposure temperature shall preclude testing at a lower exposure temperature. A separate sample shall be exposed for each type of exposure water selected in 5.5.3.
 
The exact surface area-to-volume ratio achieved during the exposure shall be recorded.
 
5.5.5.1 Cold application
 
Cold application product samples, as designated by the manufacturer, shall be placed in an exposure vessel and completely covered with exposure water of the applicable pH (see 5.5.3). The exposure vessel shall be placed in a 23 ± 2 °C (73 ± 4 °F) environment for the duration of the exposure period.

Benefits of NSF Certification

To help minimize the risk of contaminants, NSF certifies individual concrete ingredients to the requirements of NSF/ANSI Standard 61: Drinking Water System Components – Health Effects. Our Concrete Site Mix Design Evaluation Program provides a one-time evaluation that certifies concrete consisting of non-certified cement or other ingredients against this same standard.

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.
 
NSF Certification Process

We require information on each ingredient in the site mix and details of its end use structure. Since we have worked with the cement admixture industry for over 20 years, we are able to obtain any additional information on ingredient composition relatively quickly. We perform testing on concrete cylinders manufactured from the mix, including analysis for the potential release of regulated metals, radionuclides, volatile organics and other contaminants that may leach directly into drinking water. Results are typically available in 30 days or less.
 

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 in Google News and NPCA, National Precast Concrete Association

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

Precast Concrete Form Cleaning and Release Application for Potable Water Tanks

Posted by Hill and Griffith Company on Jul 20, 2018 2:52:02 PM

Quality Control for Precast Concrete Form Release for Potable Water

concrete_potable_water-tower

Pre-pour operations

1. Cleaning of Forms

After each use, forms need to be cleaned. Tape, polystyrene, concrete, and other materials sticking to the forms needs to be removed. It is easiest to clean forms immediately after products are stripped. Waiting too long allows the concrete to bond more strongly to the forms.

2. Form Release Agent Application

Form release agent needs to be applied after cleaning the forms and sealing the seams. Don't over-apply form release agent, which may lead to puddling. It is recommended that form release agents be applied in a thin coat. Puddles need to be drained or mopped up before casting.


Items to be embedded in concrete, such as re-bar and other fixtures need to be clean of form release agent. Release agents stop concrete from bonding or sticking to molds. Rebar, inserts and other items, which concrete release agents have been applied may fail to bond to concrete and not be effective in their functions.


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 in Google News and NPCA, National Precast Concrete Association

Northeast Ohio Precast Opens in Salem

Why Choose Easi-Set Precast Concrete Buildings

Steven Holl’s Glassell School of Art is clad with 178 unique precast panels


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, American Concrete Institute, NSF/ANSI 61 Potable Water, Potable Water Tanks, Concrete Form Release Agent

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