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Open AccessArticle

Microscopic Mechanism of the Macroscopic Mechanical Properties of Cement Modified Subgrade Silty Soil Subjected to Freeze-Thaw Cycles

1
School of Transportation, Jilin University, Changchun 130022, China
2
School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130118, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(6), 2182; https://doi.org/10.3390/app10062182
Received: 4 February 2020 / Accepted: 20 March 2020 / Published: 23 March 2020
In order to study the effects of the microstructure parameters of cement modified subgrade silty soil (CMSS) in a frozen area under freeze-thaw (F-T) cycles on the macroscopic mechanical properties, the static triaxial test, scanning electron microscopy (SEM), and grey relation analysis (GRA) were implemented on silty soil modified with 0% and 2% cement at optimum moisture content from the northwest in Jilin Province in China. The results showed that the shear strength, the cohesion of 0% and 2% CMSS, decreased with the increase of F-T cycles, while the internal friction angle was not obviously changed. The shear strength and its parameters of 2% CMSS doubled compared to that of 0% CMSS. The micro-parameters, representing the particle morphological characteristics, particle arrangement, and pore characteristics of CMSS, changed differently under F-T cycles. If the cement was not added, the cohesion and the internal friction angle were most sensitive to the average particle diameter (Dp) and the average particle abundance (C), respectively. When the cement content was 2%, the cohesion was chiefly affected by the particle size fractal dimension (Dps), while the internal friction angle was mainly related to the average pore diameter (Dh). The main principle of cement improvement was to decrease Dh of soil under F-T cycles. View Full-Text
Keywords: seasonally frozen area; freeze-thaw cycles; microscopic parameters; macroscopic mechanical properties; cement modified subgrade silty soil seasonally frozen area; freeze-thaw cycles; microscopic parameters; macroscopic mechanical properties; cement modified subgrade silty soil
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Liu, H.; Sun, S.; Wang, L.; Zhang, Y.; Wang, J.; Luo, G.; Han, L. Microscopic Mechanism of the Macroscopic Mechanical Properties of Cement Modified Subgrade Silty Soil Subjected to Freeze-Thaw Cycles. Appl. Sci. 2020, 10, 2182.

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