Additive for preparing lightweight concrete including an organic polymeric material and an air entraining agent

摘要

An additive for use in the preparation of lightweight concrete, which include a blend of 40% to 99% of organic polymeric material 1% to 60% of an air entraining agent. The additive is particularly suitable for the preparation of lightweight concrete that uses polystyrene aggregate. It provides for dispersion of the polystyrene aggregate and bond between the polystyrene aggregate and surrounding cementitious binder. The resultant lightweight concrete formulation may be pumped and is particularly suitable for sandwich wall construction. The organic polymeric material is selected from a group consisting of hydroxymethylcellulose, hydroxyethyl cellulose, hydroxy propyl methyl cellulose, starch, alginate, polyvinyl alcohol, polyethylene oxide and polypropylene oxide. The air entraining agent can be either one or more nonionic, cationic or anionic surfactants and may be a sodium salt of alpha olefin sulphonate, or sodium lauryl sulphate or sulphonate.