Development of the nano-composite cement:Application in regulating grouting in complex ground conditions  

作　　者：WANG Sheng WANG Jing-fei YUAN Chao-peng CHEN Li-yi XU Shi-tong GUO Kai-bin 

机构地区：[1]State Key Laboratory of Geohazard Prevention & Geoenvironment Protection,Chengdu University of Technology

出　　处：《Journal of Mountain Science》2018年第7期1572-1584,共13页山地科学学报（英文）

基　　金：funded by National Natural Science of China (Grant Nos.41672362);Key Projects of Sichuan Provincial Department of Education (Grant No.16ZA0099);the State Key Laboratory of Geohazard Prevention & Geoenvironment Protection (Grant No.SKLGP2017Z011)

摘　　要：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.

关 键 词：NANO-SILICA Silicate-sulpho-aluminate composite cement grout Controlled grouting Complex ground conditions 

分 类 号：TQ172.1[化学工程—水泥工业]