Improvement of the fluidity and setting time of grouting materials has been recognized as an effective approach of seepage prevention in foundation works, and it is quite common to be used for handling severe leakages in complex ground conditions, such as loose, broken and fully fissured stratum. For the purposed of better meeting the engineering requirements, experimental studies were conducted in this study with focus on the nanocomposite grouting materials and the related controlled grouting technology. As compared with the commonly used silicate-sulpho-aluminate composite cement, which is characterized by relatively poor rheological property, quick setting time and low strength, the most suitable nano-material with proper reactants were selected intentionally to improve the mentioned attributes of composite cement. Due to the setting time and strength of the targeted cement slurry behaving with poor performance of harmonization to engineering construction problems, hydration synergistic effect of these composites were investigated in our experiments. Results showed that the properties of grouting materials, including initial fluidity, setting time, ideal right-angle thickening, and early strength and late strength were sufficient to produce an expected grouting application. It is therefore advocated that the refined grouting material could provide a better solution to fix grouting problems in complex ground cementing operations.
This research was funded by National Natural Science of China (Grant Nos. 41672362), Key Projects of Sichuan Provincial Department of Education (Grant No.16ZA0099) and the State Key Laboratory of Geohazard Prevention & Geoenvironment Protection (Grant No. SKLGP2017Z011). Some of the experiments presented in this paper were conducted at Chengdu University of Technology.
He Y, Zhang X, Gu MD, et al. (2016) Effect of organosilanemodified polycarboxylate-superplasticizer on fluidity and hydration process of cement paste. Journal of the Chinese Ceramic Society 44(8): 1166–1172. https://doi.org/10.3390/nano6080153 (In Chinese)Google Scholar