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Grouting is a vital technique for controlling the stability of fractured surrounding rock. To address the limitations of traditional cement-based grouting materials—such as high brittleness， poor deformation adaptability， and susceptibility to cracking and failure—a novel toughened cement-based grouting material has been developed by incorporating modified Rice Husk Fiber (RHF)， which underwent treatment through crushing， acid boiling， alkali soaking， and surface coating. We conducted slurry fluidity tests and experiments on the unconfined compressive strength， flexural strength， and static elastic modulus of the hardened specimens to determine the slurry’s setting time， flowability， and bleeding rate. By analyzing the stress-strain curves and failure modes of the samples， we investigated the influence and toughening effect of RHF incorporation on the engineering properties of cement-based grouting materials to identify the optimal fiber content. Furthermore， microstructural characterization techniques such as Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were employed to elucidate the toughening mechanism of RHF within the cement matrix. The results indicate that: (1) As RHF content increases， the slurry's flowability， bleeding rate， and compressive strength gradually decrease， while the initial and final setting times are prolonged. The flexural strength initially increases before decreasing. Notably， the axial strain of the specimens rises， post-peak residual strength improves， the compressive failure mode transitions from columnar brittle splitting to ductile shear failure， and flexural cracks evolve from brittle bending cracks to ductile bending–shear cracks， demonstrating enhanced deformation compatibility of the material. The optimum toughness is achieved at an RHF content of 3‰. (2) RHF forms an effective bond with the cement matrix through interfacial friction， adhesion， and interlocking effects， providing bridging， pull-out， and fracture resistance. This inhibits crack development， enhances the deformation capacity and energy absorption characteristics of the material， and leads to improved toughness in cement-based grouting materials. These research findings provide a scientific basis for optimizing grouting reinforcement materials for fractured surrounding rock and ensuring engineering safety.
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Basic Information:
DOI：10.13637/j.issn.1009-6094.2025.1805
China Classification Code:TU578
Citation Information:
[1]Zhang Jianjun,Han Jian,Sun Chuang ,et al.Engineering properties of cement-based grout toughened with modified rice husk fiber[J].Journal of Safety and Environment().DOI:10.13637/j.issn.1009-6094.2025.1805.
Fund Information:
辽宁省重点项目（JYTZD2023077）
2026-08-07
2026-08-07
2026-08-07