High salinity containing cement composition additives and high salinity containing cement composition

摘要

PROBLEM TO BE SOLVED: To provide an additive for highly saline cement compositions, by which a cement composition having high water-reducing performance and high fluidity can be manufactured without being influenced by salt.;SOLUTION: The additive for highly saline cement compositions includes a copolymer A including a monomer A of formula (1), and/or a monomer B of formula (2) and a monomer C such as acrylic acid as structural units and having the mass ratio of A and/or B:C=70-90:10-30, the mass ratio of A:B=0-100:100-0 and an average additional molar number of an oxyalkylene group of 10-35, and/or a copolymer B including a specific monomer F and a monomer G such as methacrylic acid or maleic acid as structural units and having the mass ratio of F:G=70-90:10-30 and an average additional molar number of the oxyalkylene group of 50-150.;COPYRIGHT: (C)2013,JPO&INPIT