Drying Shrinkage of Cement-Based Materials Under Conditions of Constant Temperature and Varying Humidity
Drying Shrinkage of Cement-Based Materials Under Conditions of Constant Temperature and Varying Humidity出 版 物：《Journal of China University of Mining and Technology》 (中国矿业大学学报（英文版）)
年 卷 期：2007年第17卷第3期
页 面：428-431页
核心收录：
学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学]
基 金：Projects 2005AA332010 supported by the State High Technology Development Program (863) of China 50408016 by the National Natural Science Foundation of China
主 题：humidity variation volume deformation pore structure
摘 要：Currently,deformations along the central axis of specimens were usually measured under fixed environmental conditions. Seldom were the effects of environmental factors on the drying-shrinkage deformation of cement-based ma-terial considered. For this paper,the drying-shrinkage deformation at different w/b ratios and different additions to mor-tars was investigated under different environments at a temperature of 20 ℃ and humidity ranging from 100% to 50%. The specimens were cured in water for 28 days before measurement. The results illustrate that mortar shows much less shrinkage under various drying conditions when a lower w/b ratio is adopted. With a decrease in relative humidity the speed of drying-shrinkage becomes gradually lower. The addition of silica fume reduces the drying-shrinkage of mortar under higher relative humidity,because the pore structure of mortar with silica fume becomes more refined. The addi-tion of fly ash increases the total porosity and the volume of coarse pores in the mortar. The drying-shrinkage of mortar under different conditions increases with the addition of more of fly ash.
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