The original chemical concrete bonding agent 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.
It can be "painted on" in a single application 1 to 10 days prior to concrete placement.
Use Weld-crete's open time to your advantage in bonding to concrete shear walls, where you need a time-lapse between application of bonding agent, placement of reinforcing steel, placement of formwork and placement of concrete.
Weld-Crete is also used for bonding setting beds ceramic tile and for bonding portland cement plaster and stucco mixes; and to bond to such surfaces as brick, block, tile, marble, metal, glass block, soundly adhered paint (non-soluble in water), and silicone.
Coverage: 200 to 300 sq. ft./gallon, approximately, depending upon method of application, temperatures, prosity and texture of substrate.
Packaging: 5 gal. (pail) / and 1 gallon.
Color: Blue (non-bleeding).
Test Method & Result (Data obtained from tests conducted periodically by leading independent laboratories. Test Report are available on request.)
Tensile Bond Strength
ASTM C-932 for Paster-Weld, average 485 psi. after 28 days
Flexural Bond Strength
ASTM C-78 (concrete beams laminated with bonding agent) 603 psi.
Shear Bond Strength
ASTM C-1042 (slant shear cylinder test). 740 psi.Avg. 14 days.
ASTM C-932 (Plaster-Weld) Specimens brought to 145° F, no bond failure.
5 cycles freeze (-10°F & thaw), Freeze-thaw stable.
Enclosed mice exposed to 30 cc volatilized bonding agent for 1hr. Non-toxic, no ill effects after 7 days.
ASTM E-110 (bonded assembly). Passed 2 hr. Fire Test 1800°F and 1 hour Hose Stream Test.
Lab. test for fire resistance. Non-flammable; meets MIL-B-19235C
1" concrete slabs bonded to 1/2" gypsum plaster subjected to seepage of strong detergents & synthetic urine for 10 hrs a day. No Bond failure after 25 consecutive days. Also unaffected by alkalinity of cement.
Lab. test & field proven. Non-deteriorating bond; retains strength & flexibility.