水和氯离子在砂浆中的迁移规律
发布时间：2018-11-03 17:50
【摘要】：研究了水灰比、氯盐浓度对砂浆中水和氯离子侵入规律的影响和砂浆的微观形貌,通过磨粉滴定的方法测定了氯离子含量,分析了毛细吸盐条件下水和氯离子传输之间的相关性规律。结果表明:氯离子的传输以水为载体,但明显滞后于水的传输,两者非同步;水灰比为0.6砂浆试件中的水侵入深度大约为氯离子侵入深度的2倍,水灰比为0.4试件的水侵入深度是氯离子的1.5倍左右;毛细吸盐7 d后,水灰比为0.6砂浆内部容易形成氯化钠结晶,延缓水迁移;在毛细吸附初始阶段,水渗透深度与氯离子渗透深度之间近似呈现线性相关,随着时间的增长,水分迁移变缓,氯离子在浓度梯度作用下继续向深处扩散;氯盐浓度超过6%后,氯离子侵入量不再随盐浓度的增大而增大。
[Abstract]:The influence of water-cement ratio and chloride concentration on the invasion law of water and chloride ions in mortar and the microstructure of mortar were studied. The content of chloride ion was determined by grinding titration. The correlation between water and chloride ion transport under the condition of capillary salt absorption was analyzed. The results show that water is the carrier of chloride ion transport, but it lags behind the water transport obviously. The water-cement ratio of 0.6 mortar specimen is about 2 times of the depth of chloride ion invasion, and the water depth of 0.4 sample is about 1.5 times of that of chlorine ion. When the capillary absorbs salt for 7 days, sodium chloride crystals are easily formed in the mortar with a water-cement ratio of 0.6, and the migration of water is delayed. At the initial stage of capillary adsorption, there was an approximate linear correlation between the depth of water permeation and the depth of chloride ion permeation. With the increase of time, the water migration slowed down, and chloride ions continued to diffuse deep under the action of concentration gradient. When chloride concentration is more than 6%, the amount of chloride ion invasion does not increase with the increase of salt concentration.
【作者单位】： 青岛理工大学土木工程学院;卡尔斯鲁厄理工学院混凝土结构与建筑材料研究所;
【基金】：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
【分类号】：TU578.1
本文编号：2308511
[Abstract]:The influence of water-cement ratio and chloride concentration on the invasion law of water and chloride ions in mortar and the microstructure of mortar were studied. The content of chloride ion was determined by grinding titration. The correlation between water and chloride ion transport under the condition of capillary salt absorption was analyzed. The results show that water is the carrier of chloride ion transport, but it lags behind the water transport obviously. The water-cement ratio of 0.6 mortar specimen is about 2 times of the depth of chloride ion invasion, and the water depth of 0.4 sample is about 1.5 times of that of chlorine ion. When the capillary absorbs salt for 7 days, sodium chloride crystals are easily formed in the mortar with a water-cement ratio of 0.6, and the migration of water is delayed. At the initial stage of capillary adsorption, there was an approximate linear correlation between the depth of water permeation and the depth of chloride ion permeation. With the increase of time, the water migration slowed down, and chloride ions continued to diffuse deep under the action of concentration gradient. When chloride concentration is more than 6%, the amount of chloride ion invasion does not increase with the increase of salt concentration.
【作者单位】： 青岛理工大学土木工程学院;卡尔斯鲁厄理工学院混凝土结构与建筑材料研究所;
【基金】：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
【分类号】：TU578.1
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