水泥对脱硫石膏性能影响的试验研究

发布时间：2018-06-05 13:30

本文选题：石膏 + 水泥　；参考：《科学技术与工程》2017年01期

【摘要】：为改善脱硫石膏的性能,使其在建筑工程中应用更为广泛。通过对不同水泥掺量的石膏进行抗压强度和抗折强度试验,探究石膏强度与水泥掺量的关系;并通过扫描电镜实验(SEM)和X射线衍射实验(XRD)对单掺水泥石膏强度变化的微观机制进行分析。研究结果表明:水泥掺入脱硫石膏后可以一定程度上改善脱硫石膏的力学性能,提高脱硫石膏的强度。通过微观机理分析发现,水泥-石膏混合体系中会产生钙矾石,由于钙矾石的膨胀以及硅酸钙水化后生成的水化硅酸钙凝胶填充于石膏孔隙,使石膏趋于密实,从微观上解释了石膏强度的增长机制。但由于钙矾石的膨胀具有双重作用,因此存在水泥的最经济掺加量,实验研究确定脱硫石膏中水泥的最经济掺加量为10%。
[Abstract]:In order to improve the performance of desulphurized gypsum, it is widely used in construction engineering. By testing the compressive strength and flexural strength of gypsum with different cement content, the relationship between gypsum strength and cement content is explored. The microcosmic mechanism of strength change of cement gypsum was analyzed by SEM (SEM) and X-ray diffraction (XRD). The results show that the mechanical properties of desulphurized gypsum can be improved and the strength of desulphurized gypsum can be improved by adding cement into desulphurized gypsum to a certain extent. The microcosmic mechanism analysis shows that ettringite will be produced in the cement gypsum mixed system. Due to the expansion of ettringite and the hydration of calcium silicate gel filled in the pores of gypsum, the gypsum tends to be dense. The growth mechanism of gypsum strength is explained microscopically. However, the expansion of ettringite has a dual function, so there is the most economical addition of cement. The most economical addition of cement in desulphurization gypsum is determined to be 10% by experiment.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;天津大学岩土工程研究所;天津开发区福林发展有限公司;
【基金】：国家自然科学基金(51279127)、国家自然科学基金优秀青年基金(51322904)、国家自然科学基金(41372291)资助
【分类号】：TQ177.375

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