STRENGTH IMPROVING AGENT FOR CEMENT HARDENED BODY AND CEMENT HARDENED BODY OBTAINED BY BLENDING THE STRENGTH IMPROVING AGENT

PROBLEM TO BE SOLVED: To provide a strength improving agent for a cement hardened body capable of promoting the effective utilization of resource and recycling by effectively using the burned kaolin-containing material being the waste materials of ceramics, clay roofing tiles and the like which conventionally have a problem with their use as an aggregate of the cement hardened body because they bring about significant strength deficiency comparing with a natural aggregate, and also to provide the cement hardened body which is obtained by blending the above agent and can be used for middle- and large-sized concrete products such as a box culvert, public utility conduit, L-shaped protecting wall, street gutter or the like which are required to have above a certain strength, and also for a ready-mixed concrete for civil engineering and construction which are required to have a relative high strength. SOLUTION: This strength improving agent for the cement hardened body is a powdery granule obtained by pulverizing the burned kaolin-containing material, and particularly is characterized by including a fine powder having a particle size of 0.075 mm or less in an amount of 5 wt.% or more based on the whole powdery granule. The cement hardened body is obtained by blending the above strength improving agent. COPYRIGHT: (C)2004,JPO