Experimental study on strength and microstructural properties of hydrous magnesium alkalization in colligation with tropical laterite soil at ambient temperature

Ayila, Ayele Adane; Ramana Murty, V

doi:10.1007/s12046-024-02435-w

Cited by 2 publications

(1 citation statement)

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“…Soil stabilization using chemical additives such as cement (Cheng et al 2013;Consoli et al 2013;Kulanthaivel et al 2023), lime (Chen et al 2020;Banu and Attom 2023;Nan et al 2024), cementsludge ash (Durante Ingunza et al 2015;Chang et al 2022), magnesium chloride mixtures with alkaline activators (Muhammad et al 2018;Ayila and Ramana Murty 2024), xanthan gum (Bagheri et al 2023;Banne et al 2024), and bitumen emulsion (Andavan and Kumar 2020) have long been employed to improve the engineering properties of weak soils. However, their drawbacks, including extensive labor requirements, high costs, and, more importantly, adverse environmental impacts, have underscored the need for more sustainable alternatives.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cementation Ratio and Molarity on Mechanical Properties of MICP-Treated Sand Subjected to Freeze-Thaw Cycles

Abbasi,

Hosseinpour,

Barari

et al. 2024

Preprint

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This study investigates the efficacy of microbial-induced carbonate precipitation (MICP) on the mechanical properties of poorly graded sand through a set of laboratory experiments. Unconfined Compressive Strength (UCS), Ultrasonic Pulse Velocity (UPV), Scanning Electron Microscopy (SEM), and calcium carbonate assessments were conducted to evaluate the influence of MICP under varying cementation concentrations, cementation ratios, and injection cycles. To this end, treated samples underwent 3, 14, and 21 injection cycles with cementation ratios ranging from 10–90% and molarities of 0.25, 0.5, 0.75, and 1 mol/L. Optimally stabilized samples were then subjected to 2, 4, 6, 8, 10, and 12 freeze-thaw cycles to evaluate their thermal durability. Correlation relationships were also developed to predict the compressive strength and stiffness of MICP-treated sand. Results demonstrated that MICP treatment effectively enhanced the UCS and stiffness by forming interlocking zones between the sand particles. Accordingly, the maximum UCS, secant stiffness, and constrained modulus were achieved at 14.98% calcite content using Sporosarcina pasteurii bacteria accompanied by a 50% cementation ratio and molarity of 0.75 mol/L over 21 injection cycles. Also, the optimally stabilized specimens exhibited 70% and 90% retention in USC and stiffness after 12 freeze-thaw cycles, confirming their sustainability under harsh thermal conditions.

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