| 摘要 |
PURPOSE: Provided are a shrinkage reducer for cement mortar which has high compression strength, prevents initial cracking and enables a differential mixing according to season, and a cement mortar for hot floor(ondol)-plastering prepared therewith. CONSTITUTION: The shrinkage reducer is formed by adding blast slag powder and fly ashes, being less than 50wt.%(based on the fly ashes) each, to ashes obtained by burning a mixture of 30-70% of lime stone(5mm in size) and 30-70% of petroleum coke at 850deg.C. The cement mortar contains 70-80wt.% of cement, 15-30wt.% of prepared shrinkage reducer and sand more than 2.8 in fineness modulus(FM), where the ratio of the raw materials comprising shrinkage reducer and cement to sand is 1 : 2.5-3.
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