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| expansive cement |
A cement which when mixed with water forms a paste that tends to increase in volume, after setting, to a significantly greater degree than Portland cement paste does; used to compensate for volume decrease due to shrinkage or to induce tensile stress in reinforcement. Classified as Type K: Contains anhydrous aluminosulfate burned simultaneously with a Portland cement composition, or burned separately when it is to be inter-ground with Portland cement clinker or blended with Portland cement, calcium sulfate, and free lime. Type M: A mixture of Portland cement, calcium aluminates cement, and calcium sulfate. Type S: A Portland cement containing a large computed tri calcium aluminates content, modified by an excess of calcium sulfate above usual optimum content.
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