环保型套筒灌浆料的配合比设计及性能研究

摘要/Abstract

摘要： 选用碱矿渣水泥作为胶凝材料,结合Dinger-Funk方程的最紧密堆积理论,用粉煤灰漂珠作为矿物掺合料,并用铜尾矿砂部分取代天然砂来提高粉体的堆积密度,制备套筒灌浆料。研究了塑性膨胀剂掺量、粉煤灰漂珠掺量、铜尾矿掺量、砂胶比对套筒灌浆料性能的影响,并对最紧密堆积设计配合比进行了验证。结果表明:随着塑性膨胀剂掺量的增加,套筒灌浆料的竖向膨胀率不断增大,流动度增大,1 d和3 d抗压强度降低;随着粉煤灰漂珠掺量的增加,套筒灌浆料的流动度不断增大,而抗压强度不断降低;随着铜尾矿掺量的增加,套筒灌浆料的流动度不断降低,抗压强度先增大后减小;砂胶(质量)比增大时,套筒灌浆料流动度不断降低,抗压强度先增大后减小;质量配合比为塑性膨胀剂掺量0.2%,砂胶比1.1,粉煤灰漂珠掺量12%,铜尾矿掺量13%时(以上均为质量分数),能制出初始流动度340 mm,30 min流动度280 mm,1 d抗压强度37.2 MPa,3 d抗压强度63.0 MPa,28 d抗压强度86.4 MPa,3 h竖向膨胀率为0.20%,24 h竖向膨胀率为0.36%的套筒灌浆料。

关键词: 碱矿渣水泥, 紧密堆积, 环保型套筒灌浆料, 流动度, 抗压强度, 竖向膨胀率

Abstract: Alkali activated slag cement is selected as the binding material, combined with the tightly packed theory of Dinger-Funk equation, fly ash float beads are used as mineral admixture and copper tailings are used to replace natural sand to improve the bulk density of powder, so as to prepare sleeve grouting material. This experiment studied the effects of plastic expansion agent dosage, fly ash float beads dosage, copper tailings dosage, and the sand-binder ratio on the performance of sleeve grouting material. The closest packing design mix ratio was verified. The results show that with the increase of plastic expansion agent content, the vertical expansion rate of the sleeve grouting material increases continuously, the fluidity increases, and the early compressive strength decreases. With the increase of fly ash float beads content, the fluidity of the sleeve grouting material continues to increase, while the compressive strength continues to decrease. With the increase of copper tailings content, the fluidity of the sleeve grouting material continues to decrease, and the compressive strength first increases and then decreases. When the mass ratio of sand-binder increases, the fluidity of the sleeve grout material continues to decrease, and the compressive strength first increases and then decreases. When the plastic expansion agent is 0.2%, the sand-binder ratio is 1.1, the fly ash float beads content is 12%, and the copper tailings content is 13% (the above are all mass fraction), the sleeve grouting material prepared with the mix design has excellent performance. The initial fluidity is 340 mm, 30 min fluidity is 280 mm, 1 d compressive strength is 37.2 MPa, 3 d compressive strength is 63.0 MPa, 28 d compressive strength is 86.4 MPa, 3 h vertical expansion rate is 0.20%, 24 h vertical expansion rate is 0.36%.

Key words: alkali activated slag cement, dense packing, environment-friendly sleeve grouting material, fluidity, compressive strength, vertical expansion rate

中图分类号:

TU52

胡星, 陈东平, 余林文, 汪文文, 吴文杰. 环保型套筒灌浆料的配合比设计及性能研究[J]. 硅酸盐通报, 2021, 40(2): 557-564.

HU Xing, CHEN Dongping, YU Linwen, WANG Wenwen, WU Wenjie. Mix Design and Performance Research of Environment-Friendly Sleeve Grouting Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 557-564.

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