Abstract
Flowing water grouting is a big challenge in the tunneling and underground engineering. To enhance the early strength and grouting effectiveness of slurry for flowing water grouting, nano-CaCO3 and fly ash were mixed with cement based grout. A series of physical simulation tests were conducted to simulate the flowing water grouting process in rough rock fracture, and investigate the effect of nano-CaCO3 content on the fluid pressure and sealing efficiency of grouts. Results of viscosity tests show that the viscosity of grouts decreased with an increase of nano-CaCO3 content. Scanning electron microscope (SEM) tests indicate that nano-CaCO3 can promote the formation of fibrous hydrates and enhance the flowing water resistance of grouts. Increasing nano-CaCO3 content resulted in the first increase while later decrease of maximal fluid pressure (MFP) and sealing efficiency (SE) of grouts. Reducing water cement ratio of grouts and incorporating fly ash can effectively improve the SE of flowing water grouting.
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Acknowledgements
This investigation was supported by the National Natural Science Foundation of China (projects No. 41672274, 41002093 and 51808492); the Fundamental Research Funds for the Central Universities; the Natural science foundation of Shanghai (project No. 14ZR1442800); Opening fund of State Key Laboratory of Geohazard and Prevention Geoenvironment Protection (Chengdu University of Technology) (projects No. SKLGP 2014K013). The authors are extremely grateful for the financial support from these five organizations and China Scholarship Council (CSC) (201906260173).
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Liu, YH., Yang, P., Ouyang, ZB. et al. Effect of Nano-CaCO3 on the Sealing Efficiency of Grouts in Flowing Water Grouting. KSCE J Civ Eng 24, 2923–2930 (2020). https://doi.org/10.1007/s12205-020-2373-3
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DOI: https://doi.org/10.1007/s12205-020-2373-3