A PROPOSAL FOR STRENGTH CONTROL OF MASSIVE CONCRETE USING FLY-ASH

Abstract

We study the strength development of massive concrete using fly-ash. We propose a new idea of concrete strength control method. 1) Concrete mix proportion may be designed that the concrete strength of massive structures satisfies the specific design strength until 91 days of concrete ages. 2) In the case of the B-type fly-ash cement or substituting fly-ash for 15-30% of the cement, standard curing specimens are tested at 28 days for the strength inspection. 3) In the case of substituting fly-ash for 45% of the cement, standard curing specimens are tested at 91 days for the strength inspection.