Mechanical Properties of Fiber-Cement Improved Muck under Sulfate Erosion and Dry-Wet Cycle

doi:10.16552/j.cnki.issn1001-1625.2025.0243

Abstract

Abstract: To investigate the deterioration effects of sulfate erosion and dry-wet cycle on fiber-cement improved muck, unconfined compression tests, scanning electron microscopy (SEM) tests, and X-ray diffraction (XRD) tests were conducted on fiber-cement improved muck. The study analyzed the impacts of dry-wet cycle and the coupled effects of sulfate erosion and dry-wet cycle on the morphological characteristics, mass loss rate, mechanical properties, and deterioration mechanisms of fiber-cement improved muck. The results indicate that as the number of dry-wet cycle increases, the mass loss rate of fiber-cement improved muck gradually increases, and the peak stress of fiber-cement improved muck decreases. Polyester fibers can effectively enhance the soil's resistance to the coupled effects of sulfate erosion and dry-wet cycle, with an optimal fiber content of 0.50% (mass fraction). Compared to the sole effect of dry-wet cycle, the coupled effect of sulfate erosion and dry-wet cycle leads to a more porous internal structure in fiber-cement improved muck and generates a significant amount of ettringite, ultimately resulting in a notable deterioration of mechanical properties.

Key words: fiber-cement improved muck, sulfate erosion, dry-wet cycle, deterioration effect, mechanical property, microstructure

CLC Number:

TU447

TIAN Zhequan, LIU Tao, YU Liucheng, HUANG Xixi, ZHANG Yan, YI Xiangyang. Mechanical Properties of Fiber-Cement Improved Muck under Sulfate Erosion and Dry-Wet Cycle[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3483-3492.

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