铁尾矿砂水泥基灌浆料性能研究

Properties of Iron Tailing Sand Cement Based Grouting Material

关键词:  铁尾矿砂  灌浆料  流变  界面过渡区

Key words:  iron tailing sand  grouting material  rheology  interfacial transition zone

摘要:

分别用铁尾矿砂和石英砂为骨料来制备水泥基灌浆料,系统分析了不同骨料对水泥基灌浆料性能的影响.结果表明：用铁尾矿砂与石英砂配制的灌浆料在浆体富余系数为最佳值时,其流变学参数几乎一致,即适当的配合比设计能够保证铁尾矿砂灌浆料与石英砂灌浆料具有同等的施工性能;硬化后,铁尾矿砂灌浆料较石英砂灌浆料孔隙率更低,无害孔更多、少害孔及有害孔更少;铁尾矿砂自身硬度较石英砂低,但铁尾矿砂灌浆料界面过渡区更为密实,界面显微硬度略高.以铁尾矿砂替代石英砂作为灌浆料骨料,对灌浆料性能影响不大,具有良好的技术可行性.

Abstract:

Iron tailing sand was used as aggregate to prepare cement based grouting material. Compared with quartz sand grouting material(QG), the properties of iron tailing sand grouting material(ITG) were comprehensively analyzed. The results show that the rheological parameters of ITG are slightly different from QG, e.g. ITG has got slightly higher yield stress, almost the same plastic viscosity and slightly higher thixotropy, so the workability of ITG is slightly lower than that of QG. After hardening,the strength of ITG is slightly lower than that of QG. The porosity of ITG is lower than that of QG, and there are more harmless pores and less harmful pores in ITG. The hardness of iron tailing sand is lower than that of quartz sand, but in ITG, the interfacial transition zone is denser and the microhardness of the interface is slightly higher. It has little effect on the properties of grouting material that iron tailing sand instead of quartz sand as grouting aggregate, and has good technical feasibility.