| 摘要 |
PROBLEM TO BE SOLVED: To provide a cement composition which can retain fluidity for a relatively long time and enables production of a cement hardened body yielding practical strength in a relatively short time at low costs.SOLUTION: A cement composition comprises Portland cement, lithium sulfate and polycarboxylic acid-based admixture, and the polycarboxylic acid-based admixture contains a copolymer containing repeating units derived from monomers of formula (1) and repeating units derived from monomers of formula (2). In formulae (1) and (2), Ris independently H or a 1-18C alkyl group; n is an average addition mole number and an integer of 10-300; and M is H, a monovalent metal ion, a divalent metal ion, ammonium salt or an organic amine group. |
