METHOD OF PREPARING LOW SHRINKAGE AE CONCRETE FOR CIVIL ENGINEERING, AND THE LOW SHRINKAGE AE CONCRETE FOR CIVIL ENGINEERING

摘要

PROBLEM TO BE SOLVED: To provide a method of preparing low shrinkage AE concrete using a one component multifunctional admixture satisfying following conditions (1)-(6) at the same time, that are (1) the multifunctional admixture used as one component has excellent stability, which is a prerequisite condition; (2) excellent construction property is secured by suppressing the deterioration with time of flowability and air quantity of the prepared low shrinkage AE concrete for civil engineering; (3) dry shrinkage of a resultant hardened body is low; (4) the resultant hardened body has resistance to freeze-thaw action; (5) the resultant hardened body is slow in the neutralizing speed; (6): the resultant hardened body has reasonable excellent compression strength, and to provide the low shrinkage AE concrete for civil engineering. SOLUTION: The low shrinkage AE concrete for civil engineering is prepared using cement, water, fine aggregate, coarse aggregate, the multifunctional admixture and an air volume controlling agent, wherein the unit quantity of cement is 280-450 kg/m3, the one component multifunctional admixture comprising a specific cement dispersant, a specific dry shrinkage reducing agent and a specific separation reducing agent in a fixed ratio respectively is used by 0.3-3.0 pts.mass per 100 pts.mass cement, and the entrained air is prepared to be 3-8 vol.%. COPYRIGHT: (C)2010,JPO&INPIT