| 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 (&egr;-&egr;) as index for evaluation, where (&egr;) 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 (&egr;) represents a dry shrinkage strain value of a normal concrete. |
