STUDY ON THERMAL SHRINKAGE BEHAVIOR OF CEMENT PASTE UNDER HIGH TEMPERATURE ENVIROMENT

Abstract

The purpose of this study was to clarity deformation behavior of cement paste at high temperature environments to better understand the thermomechanical properties of concrete. The water binder ratio of the cement paste was set at three levels：W/C＝50％, W/C＝30％, The water binder ratio of the cement paste was set at three levels：w/c＝50％, w/c＝30％, and w/b＝18％. And Silica fume was added to the cement paste with W/B＝18％ at a ratio of 10mass％ to cement. The results, the deformation behavior of cement pastes at high temperature environments due to dehydration was revealed. Cement pastes with W/B18％ and W/C30％ turned from expansion behavior to shrinkage behavior near 100℃. Furthermore, the temperature dependence of the rate of thermal shrinkage with cement paste was confirmed, and it was found to vary in four stages depending on the dehydration.