Applications of Electron Probe Microanalyzer for Measurement of Cl Concentration Profile in Concrete
Applications of Electron Probe Microanalyzer for Measurement of Cl Concentration Profile in Concrete
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DOI：
10.3151/jact.4.369
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发表时间：
2006-10-01
影响因子：
2
通讯作者：
Yamamoto, Masayoshi
中科院分区：
文献类型：
--
作者：
Mori, Daisuke;Yamada, Kazuo;Yamamoto, Masayoshi
电子探针显微分析（EPMA）已被应用于混凝土中氯的定量评价。为了获得氯离子浓度的定量数据，对测量条件进行了详细的统计讨论，并介绍了样品测量条件。发现通过EPMA获得的Cl绝对浓度与湿分析法相当，基质差异的影响可以忽略不计。利用空间分辨率为100 μ m的EPMA测量的水泥浆体和骨料的化学成分差异，可以区分混凝土中的膏体部分。由于Cl通过膏体部分渗透到混凝土中，因此EPMA得到的Cl浓度分布图可用于估计Cl的表观扩散系数D-a。通过与传统切片法和研磨法的比较，确定了EPMA法测定的氯离子浓度的定量化值。根据测量结果，计算了各种混凝土配合比的Da值，结果与常规方法所得结果相当。
Electron probe microanalysis (EPMA) has been applied for the quantitative evaluation of Cl ingress into concrete. In order to obtain quantitative data on Cl concentration, the measurement conditions were discussed statistically in detail and sample measurement conditions were introduced. The absolute concentrations of Cl obtained through EPMA were found to be equivalent with wet analysis and the effect of matrix differences to be negligible. By using the difference in chemical composition between cement paste and aggregate measured by EPMA with a spatial resolution of 100 mu m, it was possible to discriminate the paste part in concrete. Since Cl penetrates into concrete through the paste part, the Cl concentration profile obtained by EPMA is useful for the estimation of the apparent Cl diffusion coefficient, D-a. The quantified value of Cl concentrations obtained with EPMA were confirmed through comparison with traditional slicing and grinding methods. Based on the measurement results, the Da value was calculated for various concrete mixtures and the results were found to be equivalent with those yielded by conventional methods.