碱性速凝剂对盾构壁后注浆浆体性能影响及微观机理研究

doi:10.11896/cldb.23040077

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Abstract Appropriate accelerators were selected to reduce the setting time of grouting slurry, thereby controlling ground settlement and minimizing early segment flotation in backfill grouting of shield projects. Two typical alkaline accelerators, Na₂CO₃ and Li₂CO₃, were utilized in the preparation of backfill grouting, and their effects on setting time, fluidity loss, and slurry strength were analyzed. Experimental results demonstrated that both types of accelerators significantly reduced the setting time of the slurry and increased its strength. However, the loss of slurry fluidity over time also accelerated. By adding 3%Na₂CO₃ and 0.5%Li₂CO₃, the setting time was reduced to 6.5 hours and 8 hours, respectively, while the fluidity maintained at 220 mm after 2.5 hours. After 14 days, the slurry strength reached 3.8 MPa, which was more than 30% higher than that of the slurry without accelerators. Microstructure analysis revealed that the alkaline accelerators promoted the hydration of cement minerals C₃A and C₃S by reacting with gypsum and CH crystals, thus shortening the setting time of the slurry. Additionally, alkaline accelerators promoted the hydration of cement to produce hydrotalcite and calcite, and stimulated the formation of C-A-S-H from fly ash, all of which enhanced the density of slurry structure and thus improved later strength.

Key words： backfill grouting alkaline accelerator setting time fluidity loss over time reaction mechanism

Published: 10 October 2024 Online: 2024-10-23

CLC number:

TU528.31

Fund:National Natural Science Foundation of China (52378394,52078189) and the Fundamental Research Funds for the Central Universities (B230201037).

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	Articles by authors
	ZHU Wenchao
	ZHANG Lei
	ZHANG Yazhou
	LI Mingqing
	ZHANG Jianfeng
	MIN Fanlu

Cite this article:

ZHU Wenchao,ZHANG Lei,ZHANG Yazhou, et al. Influence of Alkaline Accelerators on Performance of Backfill Grouting in Shield Engineering and Its Micro-mechanism[J]. Materials Reports, 2024, 38(19): 23040077-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23040077 OR http://www.mater-rep.com/EN/Y2024/V38/I19/23040077

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