摘要
混凝土中氯离子的迁移是个非常复杂的过程。一般将测量和计算硬化水泥浆体和混凝土中氯离子的迁移的方法分为非稳态和稳态两大类。对混凝土中氯离子迁移的测试方法进行了评述,并分析了其优点和缺点。北欧标准NT Build492是目前非稳态条件下快速测试氯离子扩散性最好的方法,但实际的氯离子浓度分布与其计算公式用的模型的模拟仍存在一定的差异。北欧标准NT Build355是目前稳态条件下快速测试氯离子扩散性最好的方法,但理论基础过于简化。尽管ASTM C1202或AASHTO T277在世界上被广泛应用,但实际上它是一个测量混凝土电导的方法,它可用于混凝土的质量控制,如其结果没有与混凝土的氯离子渗透性试验结果建立相关性时,不能直接用于评价混凝土的氯离子渗透性。
The transport of chloride ion in concrete is a very complicated process. Many methods have been developed and proposed to measure and calculate the transport of chloride ion in concrete under both steady and non-steady state conditions. Advantages and disadvantages of these methods are reviewed. A comparison of these testing methods indicates that NordTest NT Build 492 is the most appropriate method for accelerated chloride migration testing under non-steady state conditions, however a discrepancy exists between actual chloride profiles and the theoretical model used for calculation. NordTest NT Build 355 is the most appropriate method for accelerated testing under steady conditions, however it is oversimplified. Although ASTM C1202 or AASHTO T 277 is widely used throughout the world, it is a measurement of conductivity of concrete and can be used for concrete quality control purposes, not for evaluating the chloride ion permeability of concrete, as it does not setup correlations with other test results.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2007年第4期522-530,共9页
Journal of The Chinese Ceramic Society
关键词
混凝土
氯离子
迁移
试验方法
concrete
chloride ion
transport
test methods
