CEMENT COMPOSITION AND METHOD FOR PRODUCING HARDENED CONCRETE USING THE SAME

PROBLEM TO BE SOLVED: To provide a cement composition of high expansion and high strength in which a large expansion volume is obtained in an early stage of a material age, the expansion volume is stabilized over a long period, there are no strength reduction and cracks by the expansion, and the chemical prestress can be stably used. SOLUTION: The cement composition comprises: cement; an expansion material; dextrin; aggregate; and a polycarboxylic acid-based water reducing agent, wherein the unit quantity of the expansion material is 35-100 kg/m3, the unit quantity of dextrin is 1-10 kg/m3, and the polycarboxylic acid-based water reducing agent is 0.01-4 pts.wt. in a solid content conversion based on 100 pts.wt. of a binding material consisting of the cement and the expansion material, wherein the polycarboxylic acid-based water reducing agent is 0.13-0.55 pt.wt. in terms of the solid content based on 100 pts.wt. of the binding material, and wherein the expansion volume of the hardening body exceeds 250×10-6by a restraint expansion test method. In addition, a method for producing a concrete hardening body comprising carrying out the promotion curing using the cement composition is provided. COPYRIGHT: (C)2007,JPO&INPIT