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LARSEN CONCRETE & PLASTER BONDING AGENTS

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-soluble in water, i.e. casein and calcimine paints), and silicone.

 

Performance Properties

 

(Weld-Crete)

 

Property                                 Test Method & Results

 

 

Tensile Bond Strength           ASTM C-932 for Weld-Crete®,

                                              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.

 

Temperature Range              ASTM C-932 (Weld-Crete®)

                                              specimens brought to 145º F, no bond failure.

 

 

Freeze-thaw Stability             5 cycles freeze (-10º F & thaw).

                                              Freeze-thaw stable.

 

 

Toxicity                                 Enclosed mice exposed to 30 cc volatilized 

                                             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 1800º F and 1 hr. Hose Stream Test.

 

 

 

Flammability                        Lab. tests for fire resistance.

                                            Non-flammable; meets MIL-B-19235C.

 

 

Acid Resistance                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.

 

 

Life Expectancy                  Lab. tested & field proven. Non-deteriorating bond;

                                           retains strength & flexibility