QUANTITATIVE EVALUATION METHOD OF CRACK REDUCTION EFFECT BY SHRINKAGE-REDUCING MATERIAL, AND SELECTION METHOD OF SHRINKAGE-REDUCING MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a simple method for quantitatively evaluating the effect of a shrinkage-reducing material on the reduction of shrinkage cracks of a concrete.;SOLUTION: A method for quantitatively evaluating the effect of a shrinkage-reducing material on the reduction of shrinkage cracks includes: a step (A) of regression analysis for obtaining a regression line from dry shrinkage strain values of a non-constrained plain concrete and crack characteristic values of a constrained plain concrete having the same composition; and a step (B) of evaluation of the crack reduction effect for quantitatively representing the crack reduction effect by the dry shrinkage strain values for evaluation using a difference (ε₀-ε) as index for evaluation, where (ε) represents a dry shrinkage strain value which is on the regression line and pointed by the crack characteristic value of a low shrinkage concrete, and (ε₀) represents a dry shrinkage strain value of a normal concrete.;COPYRIGHT: (C)2014,JPO&INPIT