矿粉混凝土在海洋环境下的氯离子侵蚀研究  

Study of Chloride Ion Corrosion of Concrete with Slag in Marine Environment

作　　者：刘伟龙[1] 金祖权[1] 常洪雷[1] 张慧[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《粉煤灰》2013年第3期14-17,共4页Coal Ash China

基　　金：高性能土木工程材料国家重点实验室开放基金(2010CEM006)

摘　　要：将矿粉掺量为0～65%的混凝土置于海洋大气区、潮汐区、泥沙区1～4个月,研究海洋不同区域、腐蚀龄期以及矿粉掺量对混凝土中氯离子传输的影响。试验结果表明:混凝土中氯离子浓度随深度增加而降低,其规律符合了Fick第二定律。混凝土在海洋不同区域氯离子传输量及传输深度的规律为:潮汐区≈泥沙区>大气区。掺加矿粉混凝土稳定段的氯离子浓度都<未掺加矿粉的普通混凝土,就抗氯离子侵蚀而言,矿粉最佳掺加量约为30%(占胶凝材料百分比)。随着腐蚀时间的增长,氯离子的渗透深度逐步加深;同一深度随着时间的增长,氯离子含量逐渐增加,且前期随时间快速增加,后期增加速度降低。Concretes with 0-65% slag had been placed into atmospheric zone, tidal zone and sediment zone of marine environment for 1 and 4 months. The influence of marine zone, corrosion age and slag content on chloride ion diffusion into concrete was studied. The experimental results showed that the concentration of chloride ion decreased with increasing depth of concrete, and the transportation rule could be described with the Fick＇s second law. The chloride.ion content and its transportation depth in concrete is tidal zone^sediment zone 〉atmospheric zone. Concrete with slag could improve its chloride corrosion resistance capacity, and the most optimum slag replacement ratio for cementitious materials for concrete is 30%. Moreover, the chloride ion transportation depth and its content in concrete increased with corrosion age.

关 键 词：混凝土 矿粉 氯离子 海洋 

分 类 号：TU528.33[建筑科学—建筑技术科学]