Experimental Study on the Mechanical Performance of Grouted Specimen with Composite Ultrafine Cement Grouts

Tian, Maolin; Han, Lijun; Meng, Qinglin

doi:10.1007/s12205-020-0040-3

Cited by 18 publications

(2 citation statements)

References 37 publications

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“…Therefore, for fractured deep rocks, it is difficult to achieve good reinforcement results with cement grout. Conversely, chemical grout has small particles that can effectively fill small cracks in the deep rocks, but it is not environmentally friendly and have adverse effects on health (Jin et al, 2018;Mohammed et al, 2014;Tian et al, 2020Tian et al, , 2021.…”

Section: Introductionmentioning

confidence: 99%

“…Ultrafine cement (UC) particles are very small, and thus can be injected easily into fine cracks in rock masses (Tian et al, 2020). The pozzolanic effect of FA can reduce the dissolved or leached Ca(OH) 2 in corrosive environments and improve the fluidity and properties of fresh mixture grouts containing Portland cement (PC) and FA (Mirza et al, 2002; Wang & Lee, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Development and application of novel high‐efficiency composite ultrafine cement grouts for roadway in fractured surrounding rocks

Tian,

Chen,

Han

et al. 2023

Deep Underground Science and Engineering

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The fractured surrounding rocks of roadways pose major challenges to safe mining. Grouting has often been used to reinforce the surrounding rocks to mitigate the safety risks associated with fractured rocks. The aim of this study is to develop highly efficient composite ultrafine cement (CUC) grouts to reinforce the roadway in fractured surrounding rocks. The materials used are ultrafine cement (UC), ultrafine fly ash (UF), ultrafine slag (US), and additives (superplasticizer [SUP], aluminate ultrafine expansion agent [AUA], gypsum, and retarder). The fluidity, bleeding, shrinkage, setting time, chemical composition, microstructure, degree of hydration, and mechanical property of grouting materials were evaluated in this study. Also, a suitable and effective CUC grout mixture was used to reinforce the roadway in the fractured surrounding rock. The results have shown that the addition of UF and US reduces the plastic viscosity of CUC, and the best fluidity can be obtained by adding 40% UF and 10% US. Since UC and UF particles are small, the pozzolanic effect of UF promotes the hydration reaction, which is conductive to the stability of CUC grouts. In addition, fine particles of UC, UF, and US can effectively fill the pores, while the volumetric expansion of AUA and gypsum decreases the pores and thus affects the microstructure of the solidified grout. The compressive test results have shown that the addition of specific amounts of UF and US can ameliorate the mechanical properties of CUC grouts. Finally, the CUC22‐8 grout was used to reinforce the No. 20322 belt roadway. The results of numerical simulation and field monitoring have indicated that grouting can efficaciously reinforce the surrounding rock of the roadway. In this research, high‐performance CUC grouts were developed for surrounding rock reinforcement of underground engineering by utilizing UC and some additives.

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Section: Introductionmentioning

confidence: 99%