Experimental Investigation of Consolidation Properties of Nano-Bentonite Mixed Clayey Soil

Gang Cheng, Hong-Hu Zhu, Ya-Nan Wen, Bin Shi and Lei Gao
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Gang Cheng: School of Computer Science, North China Institute of Science and Technology, Beijing 101601, China
Hong-Hu Zhu: School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
Ya-Nan Wen: School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
Bin Shi: School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
Lei Gao: Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China

Sustainability, 2020, vol. 12, issue 2, 1-15

Abstract: As a new soil improvement method, adding nano-bentonite can enhance the engineering properties of soil. To study the stabilization effect of nano-bentonite on soil consolidation properties, a series of one-dimensional odometer tests were conducted on a clayey soil with different nano-bentonite mixing contents (i.e., 0.5%, 1%, 1.5%, and 2%). The effects of nano-bentonite on the coefficient of consolidation and permeability of the test soil were analyzed. The results show that adding a certain amount of nano-bentonite does not significantly affect the original consolidation characteristics of soil samples, but displays a notable effect on accelerating water drainage. Among all the soil samples, when the nano-bentonite mixing content is 0.5%, the final compression amount is the largest and the final void ratio is the smallest. The coefficients of consolidation and permeability increase with increasing nano-bentonite mixing content under high stress state. The test results indicate that nano-bentonite can facilitate internal cementation of soil particles, which effectively reduces the compressibility of clayey soil.

Keywords: nano-bentonite; clayey soil; consolidation; compressibility; permeability (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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