Research on the Application of Weathered Soft Rock Waste in Road Base
LIU Lei1, YAO Yong2,3,*, ZHANG Lingling3, TANG Zixin3, QIU Weibo4
1 School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China 2 Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621010, Sichuan, China 3 School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China 4 Chengdu Municipal Development Corporation, Chengdu 610072, China
Abstract: Weathered soft rock waste was used to replace crushed stone in cement-stabilized base for urban main road, and composite stabilizers composed of cement and soil stabilizers were used to treat solidified weathered soft rock aggregate. The performance and microstructure of weathered soft rock mixed aggregates under different stabilizers were investigated via compressive strength, water stability, XRD, SEM, and thermal analysis. The findings show that the stabilized weathered soft rock aggregates exhibit equivalent or superior compressive strength and water stability compared to conventional cement-stabilized crushed stone, with a maximum increase of 0.8 MPa in 7 d compressive strength. The 7 d compressive strength and the water stability coefficient of weathered soft rock mixed aggregates are enhanced by 0.2—1.1 MPa and 0.01—0.05, respectively, compared to those treated with the cement stabilizer. After 14, 28, and 60 days of curing, the composite stabilizer enhances the compressive strength and the water stability coefficient of weathered soft rock mixed aggregates by 50.56%—64.71% and 4.17%—8.07%, respectively. Both the compressive strength and saturated compressive strength exhibited quadratic polynomial relationships with curing age. When stabilized with the Type E soil stabilizer (8% SN + 0.015% Type E), the specimen has the best mechanical performance, exhibiting the 60 d compressive strength of 8.1 MPa and water stability coefficient of 0.95. The composite stabilizer promotes superior hydration compared to cement stabilizer in stabilizing weathered soft rock aggregates, generating more hydration products including C-S-H and ettringite. The needle-like, gel-like product interconnects with scattered sheet-like soft rock particles and enhances the compressive strength of the weathered soft rock mixed aggregates.
刘蕾, 姚勇, 张玲玲, 唐子歆, 仇为波. 风化软岩弃渣在道路基层的应用研究[J]. 材料导报, 2025, 39(22): 25020177-9.
LIU Lei, YAO Yong, ZHANG Lingling, TANG Zixin, QIU Weibo. Research on the Application of Weathered Soft Rock Waste in Road Base. Materials Reports, 2025, 39(22): 25020177-9.
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2025, Vol. 39 
