Experimental Study on Strength and Durability of Cement-based Fiber FluidSolidified Soil
ZHU Xiaoxiao1,2, HAO Zhili1,2, ZHU Yinwei1,2, GE Miaomiao1,3,*, SUN Aobo1,3, GE Chunyu1,2
1 College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, Zhejiang, China 2 Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, Wenzhou 325035, Zhejiang, China 3 Zhejiang International Science and Technology Cooperation Base of Ultra-soft Soil Engineering and Smart Monitoring, Wenzhou 325035, Zhejiang, China
Abstract: The strength and durability of fluid solidified soil are two key points for its resource utilization, yet its environmental durability is often overlooked compared to the strength. In this work, cement, slag and polypropylene fiber were used to improve the strength of a muddy soil from Wenzhou to prepare fluid solidified soil. The strength and durability of the fluid solidified soil were investigated by conducting a series of unconfined compressive strength tests, dry shrinkage tests, water stability tests, and cyclic wetting-drying tests. The test results show that cement combined with slag can solidify muddy soil efficiently. UCS of the fluid solidified soil prepared by 8% cement+12% slag can reach 3.85 MPa, which is 2.5 times of that solidified by 20% cement. Further adding polypropylene fiber on this basis, the failure mode of fluid solidified soil changes from brittle to plastic; the UCS of fluid solidified soil increases by 50% under the optimal fiber dosage of 0.8%. The dry shrinkage property of fluid solidified soil is also improved by adding fiber. The water stability coefficient of the fiber fluid solidified soil is above 0.95. Meanwhile, strength deterioration as well as cracking caused by cyclic wetting-drying are significantly improved by adding polypropylene fiber. Microstructure test results reveal that the interaction between the soil matrix and fibers enhances the cohesion of solidified soil. Furthermore, the fibers provide reinforcement and brid-ging-anchoring within the soil matrix, which significantly improves the durability of the flowable solidified soil. According to the tests results, 8% cement+12% slag+0.8%15 mm fiber was proposed to prepare fluid solidified soil with muddy soil.
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2026, Vol. 40 
