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Performance and mechanism of a novel biopolymer binder for clayey soil stabilization: Mechanical properties and microstructure characteristics
Highlights The LBG-treated soil shows significant mechanical improvement than natural soil. The LBG content has different effects on the failure mode of soil specimen. Curing duration affects the strength enhancement of the LBG treated soil. Multiple interactions and condensed hydrogels yield a monolithic matrix structure.
Abstract In this study, a novel stabilization approach using locust bean gum (LBG) was proposed to enhance the strength properties of natural soil. A series of laboratory tests were first performed on specimens using various biopolymer contents and curing durations. Subsequently, scanning electron microscopy and X-ray diffractometry were used to assess the intrinsic mechanism and microstructure. The LBG treatment considerably improved the mechanical strength of the natural soil, and the compressive, shear, and tensile strength increased with increasing biopolymer content. The increment in soil cohesion with increasing biopolymer content was more apparent than that in the internal friction angle. Sol–gel film sticking to soil particles significantly alters the macrofailure characteristic, which increases the failure path and ruptures plane unevenness, resulting in the failure of plane tortuosity. The increased curing duration prolonged interparticle interaction and strengthened biopolymer bonds, leading to improved mechanical properties. The enhanced effect of the LBG binder on soil can be explained by the formation of large stable aggregates with widely structured bonding groups. The entire biopolymer-soil matrix structures an integral matrix phase with a network system for strength enhancement.
Performance and mechanism of a novel biopolymer binder for clayey soil stabilization: Mechanical properties and microstructure characteristics
Highlights The LBG-treated soil shows significant mechanical improvement than natural soil. The LBG content has different effects on the failure mode of soil specimen. Curing duration affects the strength enhancement of the LBG treated soil. Multiple interactions and condensed hydrogels yield a monolithic matrix structure.
Abstract In this study, a novel stabilization approach using locust bean gum (LBG) was proposed to enhance the strength properties of natural soil. A series of laboratory tests were first performed on specimens using various biopolymer contents and curing durations. Subsequently, scanning electron microscopy and X-ray diffractometry were used to assess the intrinsic mechanism and microstructure. The LBG treatment considerably improved the mechanical strength of the natural soil, and the compressive, shear, and tensile strength increased with increasing biopolymer content. The increment in soil cohesion with increasing biopolymer content was more apparent than that in the internal friction angle. Sol–gel film sticking to soil particles significantly alters the macrofailure characteristic, which increases the failure path and ruptures plane unevenness, resulting in the failure of plane tortuosity. The increased curing duration prolonged interparticle interaction and strengthened biopolymer bonds, leading to improved mechanical properties. The enhanced effect of the LBG binder on soil can be explained by the formation of large stable aggregates with widely structured bonding groups. The entire biopolymer-soil matrix structures an integral matrix phase with a network system for strength enhancement.
Performance and mechanism of a novel biopolymer binder for clayey soil stabilization: Mechanical properties and microstructure characteristics
Liu, Jin (author) / Che, Wenyue (author) / Lan, Xiaowei (author) / Hu, Mengyuan (author) / Qi, Mengyao (author) / Song, Zezhuo (author) / Sun, Mengya (author) / Jing, Miao (author) / Qian, Wei (author) / Qi, Changqing (author)
2023-06-09
Article (Journal)
Electronic Resource
English