Importance

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Abstract

A lightweight insulating concrete composition includes a cementitious forming material and a lightweight aggregate combination of expanded vermiculite and expanded perlite, the weight ratio of one to the other not exceeding about 2:1. Preferably, the composition is about 4 parts by weight cementitious forming material and about 1 part by weight lightweight aggregate. The cementitious forming material may be a hydraulic binder and accelerator combination, and may be Portland cement, plaster of Paris, and terra alba, in a weight ratio of about 5:4:1, or calcium aluminate cement, and plaster of Paris, in a weight ratio of about 11:5. The composition may further include an air entraining admixture in an amount between about 0.5 and about 2.0 percent of the total weight of the mixture, where neutralized vinsol resin and alpha olefin sulfonate are acceptable, and a surfactant in an amount between about 0.3 and about 1.5 percent of the total weight of the mixture, where sulfonated melamine and napthalene formaldehyde are acceptable. A method of making the lightweight insulating concrete composition includes blending the cementitious forming material and the combination of lightweight aggregate of expanded vermiculite and expanded perlite, and any admixture or surfactant that may be included. A method of repairing or patching concrete surfaces using the lightweight insulating concrete, includes hydrating the composition, applying the concrete slurry and permitting it to cure for about 2 to about 4 hours until it sets.

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