Expansive cement compositions

Details Expansive cement compositions Expansive cement compositions

C - Chemistry, Metallurgy

04

B

261/58, 261/85

C04B 22/06 (2006.01)

Patent

CA 1122231

Abstract of the Disclosure The invention relates to expansive cement compositions and to expansion agents containing free lime for use in such composition. Novel expansion agents are prepared according to the invention by heating lime of particle size less than 250 microns in an atmosphere comprising water vapor at 100 to 400°C. or carbon dioxide at 350 to 850°C., or by heating a partially hydrated lime at a temperature of at least 100°C. The encapsulated limes produced in this way are useful as expansion agents in hydratable cement compositions, the amount thereof generally being less than 30%, preferably 3 to 10%, based on the weight of the cement and the additive. Cement compositions containing the novel expansion agents are useful in a wide variety of uses where shrinkage of the composition on drying has to be prevented or reduced.

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