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Barrier release agents prevent adhesion by the development of a physical film or barrier between the forming surface and the concrete. Reactive release agents are chemically active and work by the process of a chemical reaction between the release agent and the free limes available in fresh concrete. A soapy film is created which prevents adhesion.
Release agents are not required as CPF liners easily debond from the concrete during formwork striking. Throughout the concreting process and as a result of concrete pressures, entrapped air and excess mix water that would otherwise become trapped at the surface causing blemishes, can instead pass through the liner.
Lighter weight (slightly less dense than traditional concrete, depending on the resin content of the mix) May be vibrated to fill voids in forms; Allows use of regular form-release agents (in some applications) Product hard to manipulate with conventional tools such as drills and presses due to its density.
Spectacular accidents have occurred when the forms were either removed too soon or had been under-designed to carry the load imposed by the weight of the uncured concrete. "Form blowouts" also occur when under-designed formwork bends or breaks during the concrete pour (especially if filled with a high-pressure concrete pump). Consequences can ...
Air entrainment in concrete is the intentional creation of tiny air bubbles in a batch by adding an air entraining agent during mixing. A form of surfactant (a surface-active substance that in the instance reduces the surface tension between water and solids) it allows bubbles of a desired size to form.
Ethylene bis stearamide (EBS) is an organic compound with the formula (CH 2 NHC(O)C 17 H 35) 2.It is a waxy white solid and is also found as powder or beads that is widely used as a form release agent.
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Concrete floor of a parking garage being placed Pouring and smoothing out concrete at Palisades Park in Washington, DC. Workability is the ability of a fresh (plastic) concrete mix to fill the form/mold properly with the desired work (pouring, pumping, spreading, tamping, vibration) and without reducing the concrete's quality.