花岗岩尾矿砂制备砂浆的黏结性能研究

摘要/Abstract

摘要： 利用花岗岩尾矿砂(GTS)制备砂浆,研究了胶砂比、聚乙烯醇胶粉(PVAP)和聚乙烯醇纤维(PVAF)对砂浆黏结性能的影响规律,分析了砂浆破坏形式与拉伸黏结强度之间的关系,并通过SEM对其微观机理进行分析。结果表明,单掺聚乙烯醇胶粉或聚乙烯醇纤维对砂浆黏结性能均有提升,复掺聚乙烯醇胶粉和聚乙烯醇纤维时砂浆黏结性能最优。砂浆的胶砂比为1∶2,聚乙烯醇胶粉为0.9%(质量分数),聚乙烯醇纤维为1.5%(体积分数)时,黏结性能最优,28 d拉伸黏结强度最高可达1.75 MPa。砂浆破坏形式与拉伸黏结强度有关。未掺聚乙烯醇胶粉与聚乙烯醇纤维时破坏形式多为界面破坏,复掺聚乙烯醇胶粉与聚乙烯醇纤维时破坏形式多为基体破坏,单掺聚乙烯醇胶粉或聚乙烯醇纤维时破坏形式多为界面-基体破坏。

关键词: 花岗岩尾矿砂, 黏结性能, 拉伸黏结强度, 破坏形式, 胶砂比

Abstract: Granite tailing sand (GTS) was used to prepare mortar. The influences of binder-sand ratio, polyvinyl alcohol latex powder (PVAP) and polyvinyl alcohol fiber (PVAF) on the adhesion property of mortar were studied. The relationship between mortar failure mode and tensile adhesion strength was analyzed, and its micro-mechanism was studied by SEM. The results show that the adhesion property of the mortar is improved by single-doped with PVAP or PVAF, and be optimal when PVAP and PVAF are mixed-doped. When the binder-sand ratio for mortar is 1∶2, PVAP is 0.9% (mass fraction) and PVAF is 1.5% (volume fraction), the adhesion property of mortar is optimal, and the 28 d tensile adhesion strength is up to 1.75 MPa. The failure mode of mortar is affected by the tensile adhesion strength. The failure mode is mostly interfacial failure when PVAP and PVAF are not added. The failure mode is mostly matrix failure when PVAP and PVAF are mixed-doped. The failure mode is mostly interface-matrix failure when PVAP or PVAF is single-doped.

Key words: granite tailing sand, adhesion property, tensile adhesion strength, failure mode, binder-sand ratio

中图分类号:

TU528

何娟, 刘双, 宋学锋, 徐单汉苏, 李萌萌. 花岗岩尾矿砂制备砂浆的黏结性能研究[J]. 硅酸盐通报, 2024, 43(7): 2565-2576.

HE Juan, LIU Shuang, SONG Xuefeng, XU Shanhansu, LI Mengmeng. Adhesion Property of Mortar Prepared by Granite Tailing Sand[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2565-2576.

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