WORKABILITY-IMPROVING AGENTS FOR CEMENT COMPOSITIONS

摘要

A workability-improving agent for improvingt the workability of cementitious compositions comprises at least one polyalkylene oxide derivative represented by the formula (I): R<1>-(CO)a-(O)b-(AO)n-X, wherein R1 is a hydrocarbon group of from 3 to 18 carbon atoms or a residual group of a polyamine derivative; a and b are 0 or 1; AO is an alkylene oxide of from 2 to 3 carbon atoms; (AO)n is a homopolymer or a block or random copolymer of alkylene oxide units of from 2 to 3 carbon atoms, n is an integer of from 1 to 30; X is H, methyl, ethyl, propyl, butyl, SO3Y<1> is H, Na and NH4; and/or a hydrocarbon derivative of formula (II): R<2>-(CO)c-OH wherein R<2> is a aliphatic hydrocarbon group of 8 to 18 carbon atoms, and c is an integer of 0 or 1.