フライアッシュを細骨材に事前混合したコンクリートの基礎性状の評価

抄録

“FA-sand” for concrete was the fine aggregate mixed previously with flyash (FA). However, the study about concrete with FA-sand is extremely few, and the further investigation toward to the widespread use is needed. From the above backgrounds, this study investigated the heat of hydration (simplified adiabatic temperature rise tests), the compressive strength, and the durability (chloride penetration depth, carbonation depth) of concrete with FA-sand. That is, concrete whose water cement ratio was 55% and unit water content was 175kg/m³, was made for all cases. After that, the performances of concrete with FA-sand and concrete mixed with FA in the concrete mixing time as the replacement for the fine aggregates were compared. Also the influences of the type and the manufacture method of FA-sand on the performances of concrete were evaluated. The conclusions were as follows; (1) the heat of hydration and the hardened properties of concrete with FA-sand were equal to those mixed with FA in the mixing time. (2) The stored period of FA-sand, the plant and sampling period of FA, the mixer type manufactured FA-sand were not affected on the heat of hydration and the hardened properties of concrete.