Experimental and Numerical Investigations on the Compression Behavior of Calcareous Sand-Rubber Mixture

Zhou, Ziye; Lin, Hongjie; Liu, Jiankun

doi:10.1007/978-981-19-5217-3_68

Cited by 1 publication

(1 citation statement)

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“…However, the strength and stiffness of rubber particles are much lower than those of calcareous sand (Zhou et al, 2023). The equivalent volume replacement of rubber in calcareous sand directly weakened the strength and stiffness of the original pure calcareous sand frame bearing system.…”

Section: Results Of the Caco 3 Contentmentioning

confidence: 99%

Experiment on MICP-solidified calcareous sand with different rubber particle contents and sizes

Xu,

Yan

2024

Front. Mater.

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Microbially induced calcite precipitation (MICP) is a new environmentally friendly technology, with the ability to improve the mechanical properties of calcareous sand. Rubber is a high-compressibility material with a higher damping ratio than that of calcareous sand. In this study, calcareous sand was replaced by equal volume contents (0%, 1%, 3%, 5%, 7%, and 9%) and different sizes (0–1, 1–2, and 2–3 mm) of rubber, and a series of water absorption and unconfined compressive strength (UCS) tests were conducted on MICP-solidified rubber–calcareous sand (MRS). The results showed that the water absorption is reduced when the rubber content is larger. The UCS of 0–1-mm MRS decreased with the increase in rubber content. For 1–2-mm and 2–3-mm MRS, the UCS was improved by 11.30% and 15.69%, respectively, compared with the clean sand. Adding rubber promoted the formation of calcium carbonate, but the strength and stiffness of rubber particles were lower than those of the calcareous sand. Therefore, higher rubber content weakened the sand frame bearing system, and the UCS decreased when the rubber content was more than 5%. Moreover, a large amount of 0–1-mm rubber led to the increase in transverse deformation of the samples, which caused the acceleration of the destruction of the sand structure. The water absorption of 0–1-mm MRS was higher than that of 1–2-mm and 2–3-mm MRS, but the UCS of 0–1-mm MRS was lower. The best rubber size is 1–2 mm and 2–3 mm, and the best rubber content is 3%–5%. The outcome of this study may, in the authors’ view, prove beneficial in improving the strength of calcareous sand when it is reinforced by MICP-combined rubber.

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Section: Results Of the Caco 3 Contentmentioning

confidence: 99%