Patent ID: 8070878

Claim:
A method of providing a lightweight cementitious slurry comprising: forming a mixture of: 35 to 60 wt. %, on a wet basis, cementitious reactive powder comprising Portland cement, 2 to 10 wt. %, on a wet basis, expanded and chemically coated and water repellant perlite filler, 20 to 40 wt. % water, 0 to 25 wt. %, on a wet basis, secondary filler; 10 to 50 vol. %, on a wet basis, entrained air; air-entraining agent and/or foaming agent and optional additive from at least one member selected from the group consisting of water reducing agents, chemical set-accelerators, and chemical set-retarders; under conditions which provide an initial slurry temperature of at least about 40Â° F. (4.4Â° C.), wherein the perlite filler has a mean particle diameter between 20-90 microns.