Abstract
This study aims at clarifying development tendency of chemical pre-stress in crack reducing concrete, CRC, and applicability of step-by-step analytical method assuming linear creep model in predicting chemical pre-stress. This creep model employed creep function considering expansive strain. CRC simultaneously involves expansive agents and shrinkage reducing agents for increasing anti-cracking performance. Experiments employed different restraint degrees in restraining test using CRC with water to binder ratio 50, 55, 65％. As a result of the experiments, the effects of restraint degree and water-to-binder ratio on chemical pre-stress development were quantitatively clarified. Furthermore, creep strain evaluated from the test data indicated validity in applying linear creep model in pre-stress prediction. Finally, the employed analysis method successfully reproduced the experimental results, which demonstrated the reasonable accuracy in pre-stress prediction. The proposed analytical method appears to have better reproducibility in chemical pre-stress development in CRC than well known existing prediction method, so called uniform expansive energy theory.
