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对石膏对高铁灌浆材料的早期强度影响机理进行了研究.通过选用合适的原材料(特别是石膏的种类)配制出符合早期强度要求(2 h抗压强度≥20 MPa)的高铁灌浆材料;采用X射线衍射(XRD),并通过石膏的溶解特性和水化产物的溶度积等化学基本原理解释早期强度试验结果.试验结果表明:当使用硬石膏时,灌浆材料的2 h抗压强度达23 MPa,而使用天然二水石膏时,2h还测不出强度,并且使用硬石膏比使用二水石膏的灌浆材料各个龄期的抗压强度都高;用硬石膏配制的灌浆材料的水化产物是钙矾石,而用二水石膏配制的灌浆材料的水化产物是钙矾石和二水石膏共存.
The effect of gypsum on the early strength of high-speed railway grouting materials was studied.The high-speed grouting materials which meet the requirements of early strength (2 h compressive strength ≥20 MPa) were prepared by selecting the appropriate raw materials (especially the type of gypsum) Ray diffraction (XRD), and the early strength test results are explained by the chemical basic principles such as the dissolution characteristics of gypsum and the solubility product of hydration products.The results show that the compressive strength at 2 h of grouting material reaches 23 MPa, while the natural dihydrate gypsum, 2h also can not measure the strength, and the use of anhydrite gypsum than the use of grouting material at all ages of the compressive strength are high; with anhydrite grouting material formulated hydration products Is ettringite, whereas the hydration product of the grouting material formulated with gypsum dihydrate is the coexistence of ettringite and dihydrate gypsum.