CEMENT ADDITIVES

Abstract

The invention relates to a cement additive capable of improving the flowability of cement and reducing the viscosity of cement. The invention relates to a cement additive containing a polycarboxylic acid copolymer, a polycarboxylic acid copolymer containing: a structural unit (a) of which is derived from polyalkylene glycol monomer (A) in an amount from 50 to 99% by mass based on 100% by mass of the entire structural unit, polyalkylene glycol monomer (A) is represented by the following formula (1): The structural unit (b) is derived from the monomer of an unsaturated monocarboxylic acid (B) in an amount of 1 to 30% by mass based on 100% by mass of the entire structural unit; and optionally, the structural unit (c) is derived from the hydroxyalkyl ester of a carboxylic acid (C) in an amount of 0 to 20% by mass based on 100% by mass of the entire structural unit,