Strength and deformation characteristics of waste mud–solidified soil

作者：Yan Tang, Han Jiang, Zide Yang, Shiyao Xiong, Gaofeng Xu, Junhao Chen, Shi Shu · 发表于：Scientific Reports · 年份：2024 · DOI：10.1038/s41598-024-67923-9 · 被引用次数：9 · 研究领域：Grouting, Rheology, and Soil Mechanics、Microbial Applications in Construction Materials、Geotechnical Engineering and Soil Stabilization

The treatment, disposal, and resource utilization of waste mud are challenges for engineering construction. This study investigates the road performance of waste mud–solidified soil and explains how solidifying materials influence the strength and deformation characteristics of waste mud. Unconfined compressive strength tests, consolidated undrained triaxial shear tests, resonant column tests, and consolidation compression tests were conducted to evaluate the solidification effect. The test results show that with an increase in cement content from 5 to 9%, the unconfined compressive strength of the waste mud–solidified soil increased by over 100%, the curing time was extended from 3 to 28 days, and the unconfined compressive strength increased by approximately 70%. However, an increase in initial water content from 40 to 60% reduced the unconfined compressive strength by 50%. With the increase of cement content from 5 to 9%, the cohesion and friction angles increased by approximately 78% and 24%, respectively. The initial shear modulus under dynamic shear increased by approximately 38% and the shear strain corresponding to a damping ratio decay to 70% of the initial shear modulus decreased by nearly 11%. The compression coefficient decreased by approximately 55%. Scanning electron microscopy and X-ray diffraction tests showed that a higher cement content led to the formation of more hydration reaction products, especially an increase in the content of AlPO 4 , which can effec...