Study on Mechanical Strength of Sludge-modified Soil
The reasonable and effective utilization of sludge resources in road engineering is a current technical challenge.This study aims to modify sludge into roadbed fill material,with a focus on the impact of SM-C type modifier on the performance of sludge-modified soil.The study includes compaction tests,unconfined compressive strength tests,and CBR tests to analyze the evolution of the mechanical properties of modified sludge soil.Wet-dry cycle tests are conducted to study the water resistance of the sludge-modified soil,and microscopic experiments are carried out to investigate the modification mechanism of sludge-modified soil.The research findings are as follows:①The optimum moisture content of modified soil increases with the increase in modifier dosage,while the maximum dry density decreases.② The addition of the modifier significantly improves the unconfined compressive strength and CBR value of the sludge-modified soil.③With an increase in the modifier dosage,the water stability of sludge-modified soil improves significantly.④ Microscopic test results demonstrate that the modifier reacts with the sludge,generating hydration products such as calcium carbonate and hydrated calcium silicate,which fill the interparticle voids,increase particle size,and enhance mechanical strength.
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