X衍射K值法定量相测定碳硫硅钙石含量的研究  

A Study on Quantitative Phase Determination of Thaumasite Content by K-Value Method of X-Ray Diffraction

作　　者：韩国旗 温勇[1] 王超 李宇航 

机构地区：[1]新疆大学建筑工程学院,新疆 乌鲁木齐 [2]喀什大学土木工程学院,新疆 喀什

出　　处：《材料科学》2024年第5期646-655,共10页Material Sciences

摘　　要：硫酸盐侵蚀混凝土所产生的碳硫硅钙石与水化产物钙矾石难以区分,为解决因钙矾石影响而难以准确定量测定碳硫硅钙石这一问题,本文首先利用X衍射和Raman光谱法定性确定了碳硫硅钙石的存在。然后基于碳硫硅钙石和钙矾石在氯化钡溶液中化学稳定性的差异,通过化学反应去除了样品中的钙矾石,再利用X衍射K值法定量相分析了样品中碳硫硅钙石含量。研究结果表明,去除样品中的钙矾石后,通过引入X衍射定量相K值法测定,不同比例内标物的样品中碳硫硅钙石的含量一致。上述实验结果符合相同样品的物相比例不变的原则,表明选择性去除钙矾石后再用X衍射K值法定量分析碳硫硅钙石含量的测试方法可行,该方法可以为混凝土碳硫硅钙石破坏的定量分析提供依据。It is difficult to distinguish between the thaumasite produced by sulphate attack on concrete and the hydration product ettringite. In order to solve the problem of the difficulty of accurate quantitative determination of thaumasite due to the influence of ettringite, this paper firstly qualitatively determines the presence of thaumasite by the X-ray diffraction and Raman spectroscopy method. Then, based on the difference in chemical stability between thaumasite and ettringite in barium chloride solution, ettringite in the samples was removed by chemical reaction, after which the samples were analysed for the content of thaumasite by using the quantitative phase of K-value method of X-ray diffraction. The results of the study showed that after removing ettringite from the samples, the content of thaumasite in the samples with different ratios of internal standards was consistent, as determined by the introduction of the X-diffraction quantitative phase K-value method. The experimental results are in accordance with the principle of constant ratio of phases of the same sample. It is shown that the test method of removing ettringite and then quantifying the content of thaumasite by K-Value Method of X-ray Diffraction is feasible. This method can provide a basis for the quantitative analysis of thaumasite-type failure in concrete.

关 键 词：碳硫硅钙石 钙矾石 物相定量分析 K值法 

分 类 号：O43[机械工程—光学工程]