| 硫酸盐侵蚀溶液pH值对硅酸盐水泥浆体C-(A)-S-H凝胶结构的影响 |
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| 引用本文： | 张晓佳,张高展,孙道胜,刘开伟,程星星,王月明.硫酸盐侵蚀溶液pH值对硅酸盐水泥浆体C-(A)-S-H凝胶结构的影响[J].复合材料学报,2019,36(2):441-449. |
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| 作者姓名： | 张晓佳 张高展 孙道胜 刘开伟 程星星 王月明 |
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| 作者单位： | 1. 安徽建筑大学 材料与化学工程学院, 合肥 230601;
2. 安徽省先进建筑材料重点实验室, 合肥 230022 |
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| 摘 要： | C-（A）-S-H凝胶的结构不仅受水泥基材料自身组成的影响，更受其所处环境的影响。本文利用固体核磁共振（NMR）并结合去卷积技术，探究硫酸盐侵蚀溶液pH值对硅酸盐水泥浆体中C-（A）-S-H凝胶结构的影响。结果表明：硫酸盐侵蚀过程中，前期进入凝胶中的Al3+后期又会脱出，使凝胶中四配位铝（Al4]）/Si比值降低。侵蚀溶液pH值的降低促进了凝胶中Al4]的脱出，使Al4]的峰位向负值移动；同时也促进了SiO4]（AlO4]）四面体间的聚合，使C-（A）-S-H凝胶平均分子链长（MCL）增加。此外，侵蚀溶液pH值的降低，促进了浆体的水化，但抑制了浆体中钙矾石（AFt）的生成。
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| 关 键 词： | 硫酸盐侵蚀 C-S-H凝胶 pH值 Al[4]/Si 平均分子链长 |
| 收稿时间： | 2018-02-02 |
Effect of pH-value of Na2SO4 solution on the structure of C-(A)-S-H gels in Portland cement pastes |
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| ZHANG Xiaojia,ZHANG Gaozhan,SUN Daosheng,LIU Kaiwei,CHENG Xingxing,WANG Yueming.Effect of pH-value of Na2SO4 solution on the structure of C-(A)-S-H gels in Portland cement pastes[J].Acta Materiae Compositae Sinica,2019,36(2):441-449. |
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| Authors: | ZHANG Xiaojia ZHANG Gaozhan SUN Daosheng LIU Kaiwei CHENG Xingxing WANG Yueming |
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| Affiliation: | 1. School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China;
2. Anhui Key Laboratory of Advanced Building Materials, Hefei 230022, China |
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| Abstract: | C-(A)-S-H gels are not only affected by the composition of cement-based materials, but also affected by the environment. The effect of pH-values of Na2SO4 solution on the structure of C-(A)-S-H gels was studied by solid-state nuclear magnetic resonance (NMR) with deconvolution technique. The results show that the Al4]/Si value of C-(A)-S-H gels decreases in sulfate attack process, due to Al3+ entering into gel early and coming out later. The decrease of the erosion solution pH value promotes the migration of Al4] from C-S-H gels, which leads to the peak position of Al4] shifting to a negative value. It is found that the average molecular chain length (MCL) of C-S-H gel increases due to the polymerization amongSiO4] (AlO4]) tetrahedra. In addition, the degree of hydration of the pastes is improved with the decrease of the pH-value, which is not favorable to formation of AFt. |
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| Keywords: | sulfate attack C-S-H gel pH-value Al[4]/Si average molecular chain length |
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