ESTIMATED COEFFICIENTS WITH THE EARLY JUDGMENT FORMULA FOR DRYING SHRINKAGE RATE OF CONCRETE USING EXPANSIVE ADDITIVES OR SHRINKAGE REDUCING AGENTS

Abstract

In order to control drying shrinkage cracks in concrete, it is important to grasp the drying shrinkage rate of the concrete. Since the methods of measurement for length change of concrete takes as long as 6 months, JASS5 provides an early judgment formula. However, no coefficient is given for the case of using expansive additives. In this report, we collect a large amount of drying shrinkage rate data and report on the results of examining the estimated coefficients with the early judgement formula for the drying shrinkage rate of concrete using expansive additives or shrinkage reducing agents.