Mix Design and Performance Research of Environment-Friendly Sleeve Grouting Material

Abstract

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

CLC Number:

TU52

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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