CONCRETE ADMIXTURE, CONCRETE STRUCTURE AND METHOD OF PRODUCING CONCRETE STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an admixture which suppresses expansion of concrete, pop-out phenomena and occurrence of rust fluid, improves the strength and durability and is economical.SOLUTION: A concrete admixture is prepared by crushing lapis lazuli andesite or holohyaline andesite containing 30% or more holohyaline material to process into a powder or granular form. The concrete admixture is admixed in a ratio of 5-30% to the weight of cement, kneaded and placed.