珍珠岩掺合料水泥浆体的微孔结构  

MICROPORE STRUCTURE OF CEMENT PASTE WITH PERLITE ADMIXTURE

作　　者：喻乐华[1] 段庆普[1] 

机构地区：[1]华东交通大学土木建筑学院,南昌330013

出　　处：《硅酸盐学报》2006年第7期894-898,共5页Journal of The Chinese Ceramic Society

基　　金：江西省自然科学基金(0450019)资助项目

摘　　要：为探讨珍珠岩掺合料对水泥基材料性能影响的机理,用压汞法测试掺加质量分数为0～40%珍珠岩掺合料水泥石的微孔结构参数,分析珍珠岩掺合料对3,28,60d龄期水泥石孔结构参数:孔隙率、中值孔径、孔比表面积和孔级配的影响。结果表明:随着养护龄期延长和二次水化反应的进行,珍珠岩掺合料对水泥石起到了降低孔隙率、减小孔径和孔表面积的作用,可改善和优化后期水泥石的孔结构,使这些微孔从早期的少害孔(孔径20～50nm)细化为后期的无害孔(孔径<20nm),甚至消失,有助于提高水泥基材料的力学强度和耐久性。In order to investigate the mechanism affecting the performance of cement-based material due to a pedite admixture, the data on the pore structure of portland cement paste with 0-40% perlite admixture with 3-, 28- and 60-day curing times was determined by the mercury intrusion porosimetry （MIP）. Effect of the perlite admixture on the pore structure, such as porosity, median pore diameter, pore specific surface area, and pore size distribution was analyzed and discussed. The results indicate that since the second hydration reaction continues with prolonged curing time, the perlite admixture diminishes the porosity, decreases the median pore diameter and reduce the pore specific surface area in cement paste. Based on analysis of the pore size distribution, perlite admixture may further refines the less harmful pores specific of the paste （pore diameter 20-50 nm） in early stages into innocuous pores （pore diameter 〈20 nm） in the late stages enough to completely fill the pores. Therefore the admixture can improve the pore structure. It is concluded that perlite admixture should be able to increase the mechanical strength and durability of cement-based materials.

关 键 词：珍珠岩掺合料 水泥 孔结构 孔隙率 中值孔径 孔比表面积 孔级配 

分 类 号：TU528[建筑科学—建筑技术科学]