CEMENT ADMIXTURE, CEMENT COMPOSITION AND MORTAR OR CONCRETE MEMBER USING THE SAME

摘要

PURPOSE: To produce a cement admixture capable of obtaining a concert member strong in bending strength, low in dry shrinkage and excellent durability by incorporating gypsums and a metallic fiber having broad width at an end part and incorporating at need a shrinkage reducing agent and high performance water reducing agent. CONSTITUTION: The cement composition is obtained by incorporating 3-30 pts.wt. gypsums (2), 0.5-5 pts.vol. metallic fiber (3) having 1-60mm fiber length and 0.1-5mm fiber width and having the broad width at the end parts in which the board width part of both ends of the fiber has 1.5-10 times fiber width to 100 pts.vol. sum of a cement composition and an aggregate, preferably 0.5-5 pts.wt. shrinkage reducing agent (4) such as lower alcohol alkylenoxide adduct or 0.1-3.0 pts.wt. high performance water-reducing admixture (5) into 100 pts.wt. cement (1). A mortar or a concrete member is produced by compounding and kneading <=40 pts.wt. water (6) and 100-500 pts.wt. aggregate (7) based on 100 pts.wt. cement with this cement composition.