Physical and Mechanical Properties and Meso-characteristics of Foamed Mixture Lightweight Soil with Bauxite Tailings
PENG Yuansheng1,2,3, OU Xiaoduo2,*, JI Fengling1,3
1 College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong,China 2 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 3 Underground Polis Academy, Shenzhen University, Shenzhen 518060, Guangdong, China
Abstract: In order to reduce production costs and promote the application of foamed mixture lightweight soil (FMLS) in the field of civil engineering, a large number of waste bauxite tailings (BTs) were added to FMLS. Orthogonal tests were carried out to study the properties of foamed mixture lightweight soil with bauxite tailings (FMLSB), sensitivity analysis was conducted to investigate the influence factors of fluidity, wet density, and unconfined compressive strength of FMLSB. The effects of area porosity on the physical and mechanical properties of the FMLSB were discussed and analyzed, and the relationships were established. Results indicated that foam content was the largest factor affecting the wet density and unconfined compressive strength of the FMLSB, followed by cement content, and the smallest was BTs content. With the increase of wet density, the area porosity decreased exponentially. In detail, as the wet density increased from 450 kg/m3 to 1 080 kg/m3, the area porosity decreased from 97.65% to 57.15%. With the increase of area porosity of FMLSB, the 28 d unconfined compressive strength decreased exponentially, but the volumetric water absorption increased linearly. Research results provide a scientific reference for the application of FMLSB.
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2022, Vol. 36 
