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Experimental Study on Mechanical Properties and Micro-mechanism of Clay Modified by Carbon Nanotubes
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[1]CHEN Zhengfa,CHEN Zhenfei,LIU Jianpeng,et al.Experimental Study on Mechanical Properties and Micro-mechanism of Clay Modified by Carbon Nanotubes[J].Journal of Zhengzhou University (Engineering Science),2022,43(04):86-91.[doi:10.13705/j.issn.1671-6833.2022.04.012]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 04 Page number: 86-91 Column: Public date: 2022-07-03
Title:
Experimental Study on Mechanical Properties and Micro-mechanism of Clay Modified by Carbon Nanotubes
Author(s):
CHEN Zhengfa1; CHEN Zhenfei1; LIU Jianpeng1; LIU Guifeng1; LI Yan2
1.School of Environmental and Safety Engineering，Changzhou Univesity，Changzhou 213164，China;
2.Shandong Dazhan Nanomaterials Co.,Ltd.,Binzhou 256600,China
Keywords:
multi-walled carbon nanotubes; clay; soil modification; shear strength; microcosmic mechanism
CLC:
TU521. 3
DOI:
10.13705/j.issn.1671-6833.2022.04.012
Abstract:
Studying the influence of multi-walled carbon nanotubes (MWCNTs) contents on mechanical properties of modified saturated clay is of great significance for its design and application in refuse landfill clay liner materials.Triaxial compression tests and scanning electron microscope (SEM) tests were performed to analyze the influence of different MWCNTs contents on the shear strength and the mechanism of mechanical properties was revealed from the microstructure evolution.The triaxial tests results showed that the shear strength increased first and then decreased with the increasing MWCNTs content,and the maximum value was detected at 0.5% MWCNTs content.The shear strength of samples doped with MWCNTs was greater than that without content.The cohesion strength showed similar change tend with the shear strength and the maximum value existed between 0.5% and 1.0%.The internal friction angle first decreased and then increased with the increasing MWCNTs content,and the minimum value appeared at 1.0% content.The results indicated that the shear strength of clay could be significantly improved by mixing MWCNTs with 0.5%-1.0% content.The MWCNTs altered the microstructure of the clay,which was the main cause of the change in the soil macroscopic mechanical properties.SEM results indicated that the contact between clay particles was relatively close and the large and small pores showed a uniform distribution in the specimen without MWCNTs content.The number and size of pores in the soil sample changed significantly after adding MWCNTs.It increased the compactness of the specimen with lower content,in which the threshold was determined to be 0.5% content,leading to the increase in shear strength.It could be observed that the number of pores increased but was less than the specimen without content with the increasing MWCNTs contents (1% and 2%).It could be attributed to the reason that the adsorption and cementation of MWCNTs on soil particles were weakened due to lubricating effect,resulting in a decrease in shear strength.
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