摘要
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.
Research on influencing mechanism of gypsum on the early strength of poured paste materials was carried out.The purpose of this paper was that the poured paste materials with meeting the requirement of the 2 h compressive strength（≥20 MPa） were formed by selecting proper raw materials（especially the type of gypsum）.The research methods of this paper were that the test results of the early strength were explained by using XRD analyses,dissolving properties of gypsums and dissolving degree product of hydration products and so on.The results showed that the 2 h compressive strength of poured paste materials reached 23 MPa when anhydrite gypsum was used and that of poured paste materials could not be measured when dihydrate gypsum was used,and the compressive strengths at different ages of the former was higher than that of the latter;the hydration products of poured paste materials formed by clihydrate gypsum was ettringite and that of poured paste materials formed by gypsum was ettringite and gypsums.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2010年第5期52-54,85,共4页
Journal of Zhengzhou University（Engineering Science）
基金
国家自然科基金资助项目(50572096)
关键词
高铁灌浆材料
早期强度
石膏
溶解特性
钙矾石
poured paste materials used in high speed railway construction
early strength
gypsum
dissolving properties
ettringite
