Larsen WELD-CRETE® Concrete Bonding Agent
Weld-Crete® bonds new concrete, stucco, tile setting beds and terrazzo to any structurally sound surface, interior or exterior. Use Weld-Crete’s® open time to your advantage in bonding to concrete shear walls when you need a time lapse between application of bonding agent, placement of reinforcement steel, placement of formwork and placement of concrete.
The original chemical concrete bonding agent, Weld-Crete® incorporates polyvinyl acetate homopolymer in a patented formulation. For exterior and interior use, Weld-Crete® will bond new concrete, Portland cement plaster and cementitious mixes to structurally sound concrete floors, walls, columns, beams, steps and ramps. Weld-Crete® can be "painted on" in a single application 1 hour to 10 days prior to concrete placement. Use Weld-Crete’s® open time to your advantage in bonding to concrete shear walls when you need a time lapse between application of bonding agent, placement of reinforcement steel, placement of formwork and placement of concrete.
Weld-Crete® is also used for: bonding setting beds for ceramic tile; bonding Portland cement plaster and stucco mixes; and to bond to surfaces such as brick, block, tile, marble, metal, glass block, soundly adhered paint (non-soluable in water, i.e. casien and calcimine paints), and silicone.
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- Tensile Bond Strength:
ASTM C 932-05 (modified) (pulling apart bonded cement briquet halves). 265 psi. Avg. 14 days.
- Flexural Bond Strength:
ASTM C-78 (concrete beams laminated with bonding agent). 603 psi. Avg.
- Shear Bond Strength:
ASTM C-1059 (slant shear cylinder test). 740 psi. Avg. 14 days.
- Temperature Range:
ASTM C-109 (specimens brought to 35 degrees F for 1 hr., then to 310 degrees F for 2 hrs). No bond failure. Shear tests 400 psi. Avg.
- Freeze-Thaw Stability:
5 cycles freeze (-10 degrees F and thaw). Freeze-thaw stable.
Enclosed mice exposed to 30 cc volatized bonding agent for 1 hr. Non-toxic, no ill effects after 7 days.
- Fire Resistance:
ASTM E-119 (bonded assembly). Passed 2 hr. Fire Test 1800 degrees F and 1 hr. Hose Stream Test.
Meets MIL-B-19235C, non-flammable.
- Acid Resistance:
1″ concrete slabs bonded to 1/2″ gypsum plaster subjected to seepage of strong detergents and synthetic urine for 10 hrs. a day. No bond failure after 25 consecutive days. Also unaffected by alkalinity of cement.
- Life Expectancy:
Lab tested and field proven. Non-deteriorating bond; retains strength and flexibility.
- ASTM C-1059
- ASTM C 631
- Military Specification, MIL-B-19235C(YD)
- General Services Administration Specification for Bond Adhesive
- Corps of Engineers Specification CE-240.01
- Canadian Standards CSA A261
- Approved: New York City Board of Standards & Appeals under Cal. No. 626-52-SM
Weld-Crete® is available from building supply dealers throughout the United States and Canada. Obtain local price quotations to determine costs.
Weld-Crete® covers approximately 200 to 300 square feet per gallon, depending on method of application, temperatures, porosity and texture of the substrate.
Weld-Crete® is available in 55 gallon drums, 5 gallon pails, gallon and quart containers.
Weld-Crete® is blue and non-bleeding.
Weld-Crete® is suited for the purposes described when used according to directions. Buyer agrees in purchasing this product that the Seller’s liability for breach of warranty shall in no case exceed the price of the product. Because of the broad range of conditions beyond our control which may be encountered in the use of the product, Larsen Products Corp. makes no other warranty, express or implied, and no agent or other person is authorized to do so. Nevertheless, we will be glad to provide information about any type of installation you may request.