Pore Structure of Cement Pastes Blended with Volcanic Rock

作     者：YU Lehua ZHOU Shuangxi LI Liling 

作者机构：School of Civil Engineering East China Jiaotong University 

出 版 物：《Journal of the Chinese Ceramic Society》 (硅酸盐学报（英文版）)

年 卷 期：2016年第3卷第1期

页      面：17-25页

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China (Grant No. 51168015) 

主　　题：cement volcanic rock paste pore diameter size 

摘      要：The pore parameters of cement pastes blended with volcanic rock at the curing age of 1, 28 and 90 d were determined by a mercury intrusion porosimetry. The pore structure of the pastes was characterized through the analysis of porosity, average pore diameter, the most probable pore aperture, pore size distribution, as well as total pore volume. For the improvement of mechanical property and durability of cement-based material, the correlation of the formed pore structure with hydration time and replacement level of volcanic rock for cement was revealed. The results indicate that volcanic rock can diminish porosity and reduce pore size in cement paste when curing time prolongs, which is particularly prominent with replacement level of less than 20% in late period. The more harmful pores(i.e., capillary pore) are gradually transformed into harmless pore(i.e., gel pores or micropore), even fully filled and disappeared when hydration products increase. The pore structure of the cement paste is thus refined. The beneficial effect of volcanic rock on the pore structure of cement paste could enhance the mechanical property and durability of cement-based material.