【摘要】 混凝土孔隙液化学组成对氯离子电迁实验影响显著。碱矿渣胶凝体系孔隙液化学组成不同于硅酸盐水泥体系。因此,普遍适用于硅酸盐水泥混凝土的氯离子电迁测试方法是否适用于碱矿渣混凝土尚存疑虑。通过实验探讨了NT BUILD 492氯离子非稳态电迁测试方法在碱矿渣混凝土中的适用性。结果显示,由于孔隙液电导率影响了测试电压和/或测试时长的选择,采用NT BUILD 492不能很好地将不同配比的碱矿渣混凝土氯离子迁移系数区分开。通过采用增大测试电压至60 V,延长测试时长至72 h的改进措施,测得的氯离子迁移系数区分度得到了较大地提高。更多还原

【Abstract】 The chemical composition of concrete pore solution has a significant effect on the chloride migration test. The pore solution chemistry of alkali activated slag(AAS) is different from that of Portland cement(PC). As a result,the suitability of the test methods commonly used in PC based systems is questionable for assessing chloride resistance of AAS. This paper studies the suitability of NT BUILD 492 non-steady state chloride migration test methods for assessing chloride resistance of AAS concretes.The results showed that due to the influence of pore solution conductivity on the decision of the voltage and/or the test duration applied,the chloride diffusivity of the AAS concretes determined by using the current protocol of NT BUILD 492 could not be adequately differentiated. Therefore,by increasing the testing voltage and testing period to 60 V and 72 h,respectively,the accuracy of the chloride diffusivity measurement for the AAS concretes has been greatly improved.更多还原