Means for reducing the shrinkage of cement and cement paste

摘要

A cement contraction-reducing agent comprising a compound represented by the general formula, RO(AO)nH (wherein R represents an alkyl group containing 1 to 7 carbon atoms or a cycloalkyl group containing 5 to 6 carbon atoms, A represents one or more alkylene groups containing 2 to 3 carbon atoms, and n represents an integer from 1 to 10), and a cement composition containing the same used for producing cement mortar and concrete.