The Geological Survey on Reactive Aggregates in the Chubu District and the Local Eff ective Utilization of Fly Ash Concretes

Abstract

Independently of newly constructed concrete structures and elder ones, the geological survey on the aggregates used in concrete may be inevitable to clarify their alkali silica reactivity, however, there has never been carried out such a survey as the daily work in Japan. This technical report represents the relationship between the geological characteristics of reactive aggregates used and their alkali-silica reactivity in the Chubu district, in which there coexist so-called “Early-expansive and Late-expansive Aggregates”. Furthermore, the countermeasure of fly ash concrete in controlling the alkali-silica reaction（ ASR） in the Chubu district is also discussed.