碳化对水泥混凝土内氯离子分布的影响

发布时间：2018-03-19 00:26

本文选题：碳化　切入点：氯离子　出处：《建筑材料学报》2015年01期 　论文类型：期刊论文

【摘要】：为合理评价钢筋混凝土腐蚀的氯离子含量,阐明碳化与氯盐复合作用下钢筋腐蚀的真实机理,研究了碳化对水泥石内氯离子分布的影响.结果表明:碳化作用下含氯盐水泥石非碳化区Friedel复盐衍射峰大量存在,而碳化区未见Friedel复盐衍射峰;碳化过程中Friedel复盐分解后产生的氯离子向非碳化区迁移和浓缩,氯离子在碳化区浓度降低,在碳化界面则明显升高.氯盐含量为1.0%(质量分数)的水泥石在碳化之前的氯离子分布比较均匀,其相对浓度峰值为68,碳化2周后峰值为151,碳化4周时峰值达到298,说明碳化与氯盐复合作用会显著降低钢筋腐蚀的初始氯离子含量,提高碳化界面的钢筋腐蚀概率,加快钢筋腐蚀速度.
[Abstract]:In order to evaluate the chloride ion content of reinforced concrete corrosion reasonably and expound the true mechanism of reinforcing bar corrosion under the action of carbonization and chloride salt. The effect of carbonation on the distribution of chloride ions in cement stone was studied. The results show that the Friedel double salt diffraction peak exists in the non-carbonized zone of chlorinated brine mudstone under carbonation, but no Friedel double salt diffraction peak is found in the carbonation zone. In the carbonation process, the chloride ions produced by the decomposition of Friedel double salt migrated and concentrated into the non-carbonized zone, and the concentration of chloride ions decreased in the carbonation zone. At the carbonation interface, the chloride ion distribution of the cement stone with a chloride content of 1.0% (mass fraction) was more uniform before carbonation. The peak value of relative concentration is 68, the peak value of carbonation is 151 after 2 weeks of carbonization, and the peak value of carbonation is 298 after 4 weeks of carbonization. It shows that the combination of carbonation and chloride can significantly reduce the initial chloride ion content of steel bar corrosion and increase the corrosion probability of steel bar at carbonation interface. Speed up the corrosion rate of steel bars.
【作者单位】：宁波大学建筑工程与环境学院;
【基金】：国家自然科学基金资助项目(51278255,51478227) 浙江省自然科学基金资助项目(LY12E08006) 宁波市重大科技计划项目(2013C51006)
【分类号】：TU528

【相似文献】