试验方法对混凝土抗氯离子渗透扩散性的影响

Effect of test methods on the chlorine ion permeability-resisting and diffusivity-resisting of concrete

采用快速氯离子渗透试验方法、稳态电迁移方法和电导方法 ,对普通水泥混凝土、轻骨料混凝土及掺粉煤灰、矿渣、硅粉、偏高岭土和稻壳灰的混凝土进行了抗氯离子渗透扩散性试验研究。结果表明 ,三种方法得到的混凝土抗氯离子渗透扩散性的结论相类似 ,但在混凝土的氯离子渗透扩散性较低时 ,相互之间的规律性不太明显。ASTMC12 0 2在许多情况下仍然可以采用 ,特别适用于不掺混合材的混凝土。

Three methods for measuring the chlorideion permeability were used,and the corresponding results were compared.The methods used were chlorideion permeability test(AASHTO T227 and ASTMC1202),steady state migration test and conductivity test.The concrete used in this paper included the control portland cement concrete,lightweight concrete and the concrete containing fly ash,slag,silica fume,metakaolin and rice husk ash.Test results indicate that three tests lead to a similar conclusion regarding the relative qualities of concretes,and there are not obvious laws among them when the charge passed lower than 1000 Coulombs.ASTMC1202 still can be used in many cases,especially for portland cement concrete.