Concrete To Concrete Bond Breaker

The thinner the new over pour the closer the expansion joints should be.

Concrete to concrete bond breaker.

Curing agents are applied to the concrete surface after placement. Easy lift fd is applied to the concrete casting slab to efficiently prevent the bonding of subsequent concrete pours. A bond breaker is a substance applied to concrete surfaces to guarantee that there is permanent bonding between the surfaces. Bond breakers are similar to anti stick material applied on adjacent metallic and nonmetallic substrates such as concrete and steel used in construction projects.

The stearates react with the calcium hydroxide lime of the concrete to produce a crude soap fig. Reactive bond breakers usually contain some type of fatty acid in the form of a stearate. Bond breakers will allow lifting and moving of precast pieces after stripping them from the form. The film can also act as a bond breaker between initial and subsequent concrete pours.

The main function of bond breakers is to minimize dynamic loads during lifting or stripping of precast members and permit their complete clean separation from casting slabs or molds. The non membrane forming bond breakers can be further categorized into reactive types and non reactive types. Essential for optimum strength development. These compounds permit newly cleanly and easily from a concrete casting bed or one another without detriment to the concrete strength or appearance.

The resultant film retains sufficient moisture in the concrete to ensure full hydration of the cement. This premium grade bondbreaker contains organic compounds that react with the concrete to produce a water impermeable barrier on the surface of the casting slab. A bond breaker is a material used to prevent adhesion of the newly placed concrete to the substrate. Bond breakers are classified as membrane forming and non membrane forming.

You ll still need to saw cut or groove expansion joints in the new slab to help control shrinkage cracks just like you would any new concrete pour. Bond breakers are available in several forms such as. Membrane cured concrete is typically harder and exhibits a dust free surface with a reduced incidence of drying shrinkage cracks. Using a bond breaker will keep the two slabs of concrete separate and the cracks will not mirror up through the new slab.

When a bond breaker is needed at a construction joint a curing compound form release agent and the like can act as a bond breaker. Dragon design in relief. In both cases the disadvantages of using bond breakers and curing compounds are related directly to the advantages they offer the low or no stick impervious surface.