Abstract
It is of paramount importance to develop an analogue to the original rock, which can simulate the model test of silty rock slope and tunnel excavation, etc. However, the physical and mechanical parameters of the existing silty mudstones are far from the original rock. In this study, a promising analogue is developed by adding the nano-CaCO3 (NC) into the mudstones, and thus, the physical and mechanical features are close to the silty original rock. (1) When the NC content is 4%, the water absorption rate and saturated water absorption rate of mudstones show a minimum value of 6.45% and 8.67%, respectively, with the uniaxial tensile strength being the highest at 2.14 MPa. When the NC content is 6%, the mudstones render the best uniaxial compressive strength of 14.35 MPa. This is due to the incorporation of NC that can effectively fill the pores of the mudstones. Besides, the NC is effective to promote the hydration reaction of gypsum and hence improve the mechanical properties. (2) When the NC content is 8%, the uniaxial tensile and compressive strength of the mudstones reduce to 1.05 and 10.45 MPa, respectively, with a minimum softening coefficient of 0.45. The maximum water absorption and saturated water absorption rate are 9.68% and 13.20%, respectively. This is attributed to the agglomeration of excessively incorporated NC particles, which becomes a primary defect in the mudstones after cementation; at the same time, there is a large gap between the agglomerated NC particles and the surrounding hydration products, which destroys the dense structure inside the mudstones.
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Funding
The authors acknowledge the financial supports received from the National Natural Science Foundation of China (No. 51838001, 51878070, 51908069, 51908073, 52078066, 52078067), the Youth Scientific and Technological Innovation Talents of Hunan Province (No. 2020RC306), the Research and Development Projects in Key Fields of Hunan Province, China (No. 2019SK2171), the Outstanding Innovative Youth Training Program of Changsha city (No. kq1905043), the “Double First-class” International Cooperation and Expansion Program for Scientific Research of Changsha University of Science & Technology (No. 2019IC04), the Graduate Student Innovation Project of Hunan Province, China (No. CX20200838), the Open Fund of National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology (No. kfj170103), and the Research and Innovative Program for Graduates of Hunan Province (No. CX20190654).
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Fu, HY., Qi, SX., Shi, ZN. et al. Effect of nano-CaCO3 on the physical and mechanical properties of analogue to silty mudstone materials. Arab J Geosci 14, 2502 (2021). https://doi.org/10.1007/s12517-021-08688-7
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DOI: https://doi.org/10.1007/s12517-021-08688-7