硅酸盐学报2017，Vol.45Issue(2)：235-241,7.DOI:10.14062/j.issn.0454-5648.2017.02.09
水和氯离子在砂浆中的迁移规律
Migration of Water and Chloride Ions into Mortar
摘要
Abstract
The influences of water-cement ratio and concentration of NaCl solution on the water and chloride ions penetration into cement mortar were investigated. The microstructure of mortar was determined by scanning electron microscopy, and the chloride content was measured by a titration method. The relationship between water penetration and chloride penetration into mortar was analyzed. The results indicate that chloride ions transport in water at the beginning, but they gradually slow down and separate from water movement. Chloride ions are much behind of the waterfront. The penetration depth of water into mortar with a water-cement ratio of 0.6 is approximately two times as the penetration depth of chloride. The water penetration depth in mortar with a water-cement ratio of 0.4 is approximately 1.5 times as the penetration depth of chloride. After 7 d capillary suction, the crystallization of sodium chloride in the cement mortar with a water-cement ratio of 0.6 can form in the pores, which affects the transport of water. At the initial stage, the relationship between the penetration depths of water and chloride ions exhibits linear. The water movement slows down, while chloride penetrates further into deep driven by the concentration gradients of chloride ions. When the concentration of NaCl solution is > 6%, the amount of chloride ions may not increase with the increase of the concentration of NaCl solution.关键词
水传输/氯离子侵入/结晶/氯离子浓度/水泥砂浆Key words
water penetration/chloride penetration/crystallization/chloride content/cement mortar分类
建筑与水利引用本文复制引用
张鹏,刘庆,耿文超,刘兆麟,赵铁军..水和氯离子在砂浆中的迁移规律[J].硅酸盐学报,2017,45(2):235-241,7.基金项目
国家“973”计划(2015CB655100)；高等学校学科创新引智计划；国家自然科学基金(51420105015，51278260)资助项目。 （2015CB655100）
