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用作回填材料的纤维增强地质聚合物胶结尾矿的力学性能

Mechanical properties of fibre-reinforced geopolymer-cemented tailings used as backfill.

作者信息

Sha Xueqiang, Cheng Chao, Pan Guoyong, Zhu Zitao, Qi Chunxiao, Chen Weidong

机构信息

China Construction Sixth Bureau Civil Engineering Co.Ltd., Tianjin, China.

出版信息

PLoS One. 2024 Dec 5;19(12):e0314617. doi: 10.1371/journal.pone.0314617. eCollection 2024.

DOI:10.1371/journal.pone.0314617
PMID:39636941
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11620621/
Abstract

Backfill materials are used in underground engineering to fill voids and buried excavated parts. In this study, solid waste was utilised as a raw material mixed with different amounts of polypropylene fibres to determine the optimal sodium hydroxide content, water-solid ratio, and fibre content. The uniaxial compressive strength (UCS) of the produced backfill materials was measured, and the interfacial structures were analysed via scanning electron microscopy. The results revealed that the mechanical properties of the backfill materials were influenced in the order sodium hydroxide doping > water-solid ratio > fibre doping. The optimal material composition corresponded to a sodium hydroxide content of 3%, water-solid ratio of 0.28, and fibre content of 5 ‰. The slag produced a C-S-H gel. Meanwhile, the fly ash and gangue contained large amounts of aluminium, which formed hydrated aluminosilicates. The addition of polypropylene fibres reduced the number of internal defects in the backfill structure and increased the UCS.

摘要

回填材料用于地下工程中填充空隙和掩埋挖掘部分。在本研究中，利用固体废物作为原料，与不同量的聚丙烯纤维混合，以确定最佳的氢氧化钠含量、水固比和纤维含量。测量了所制备回填材料的单轴抗压强度（UCS），并通过扫描电子显微镜分析了界面结构。结果表明，回填材料的力学性能受影响的顺序为氢氧化钠掺杂＞水固比＞纤维掺杂。最佳材料组成对应于氢氧化钠含量为3%、水固比为0.28和纤维含量为5‰。矿渣产生了C-S-H凝胶。同时，粉煤灰和煤矸石含有大量铝，形成了水化铝硅酸盐。聚丙烯纤维的加入减少了回填结构中的内部缺陷数量并提高了单轴抗压强度。

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