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Mechanical properties and microstructural mechanism of MICP-cemented coral sand modified with xanthan gum
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DOI：10.1016/j.apor.2026.105079.png)
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Abstract
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Coral sand foundations in island and reef environments typically exhibit low strength and high porosity. This study investigates the synergistic effect of xanthan gum (XG) and microbial-induced carbonate precipitation (MICP) on the mechanical properties and microstructure of coral sand. Coral sand specimens incorporating 0.5%–2.5% XG were treated via MICP and evaluated through unconfined compressive strength (UCS) tests, computed tomography (CT), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Compared with MICP treatment alone, the addition of XG increased the binder content by 53.57%–88.43%. At an XG content of 1.0%, the UCS reached a maximum of 6.23 MPa, which is 2.56 times that of the MICP-only group. Micro-CT analysis revealed a denser structure with reduced porosity and pore size, while SEM and XRD indicated that XG provided additional nucleation sites for calcite crystals, thereby enhancing interparticle bonding. These findings provide a biochemical strategy for reinforcing coral sand foundations in island and reef environments.
Keywords:
Microbial induced calcium carbonate precipitation
Coral sand
Xanthan gum
Mechanical properties
Microscopic mechanism
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