6/20/2023 0 Comments Concreterose![]() ![]() The foam is introduced into a cement mixer and displaces aggregates and increases the volume of the concrete without adding weight, which creates lightweight concrete.Īlthough Lightweight Concrete was the standby product for floor underlayments 30 years ago, it also came with a host of issues. This generic product was made using a foaming agent (soap type surfactant material) which is injected under pressure through a nozzle to create “foam” (microscopic air cells). These Lightweight Concrete mixes typically produce approximately 1000 psi and were used extensively in the 1960s,70s and well into the 80s for fire and sound control in wood frame multi-family apartment homes, offices, medical facilities, and many other types of structures. The most common type used in residential construction is air-entrained meaning air is introduced into cement slurry and agitated resulting in a honey-comb matrix of concrete and air voids. The two most common ways to make a concrete mix lighter are by the introduction of lightweight aggregates such as shale, volcanic rock or pumice in place of standard solid rock aggregate and by introducing air into the concrete mix, commonly referred to as “air entrainment”. ![]() Lightweight Concrete is a generic term that covers many types of concrete that are light by nature or manmade and typically range in density from 20 pcf to 120 pcf. ![]()
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