| 摘要 |
A lightweight cementitious composition comprising a dry mixture of a hydraulic cement component and a lightweight aggregate component of about 75 ppcf or less and a process involving mixing with water to produce a slurry containing at least 4 volume percent entrained air and which is easily workable and sets to produce a lightweight concrete mass having a strength of 2500 psi and a density of 115 ppcf or less. The hydraulic cement component can include two or three cement constituents. One constituent is a Type S, Type M or Type N masonry cement. A second constituent is a pozzolanic cement or an expansive cement, and a third constituent is a Type I cement, Type II cement or a Type III portland cement. In this mixture the first and second cement constituents are each present in an amount less than the third cement constituent. The second aggregate component in the dry mixture comprises a lightweight aggregate present in an mount to provide a bulk density for the dry mixture of no more than 100 pounds per cubic foot and more specifically, a bulk density of about 85 pounds per cubic foot, or less. The cementitious composition forms a readily workable paste which can be characterized as having a slump loss at one half hour of not more than 2 inches after mixing with water. The cementitious composition is conveniently packaged in a unit weighing no more than about 50 pounds per container.
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