Investigation of self-healing process and strength of biopolymer-stabilized silty sand: Comparison of Xanthan and Persian gum in geotechnical engineering

IF 6.5 Q1 CHEMISTRY, APPLIED

Carbohydrate Polymer Technologies and Applications Pub Date : 2025-06-25 DOI:10.1016/j.carpta.2025.100914

Farhad Askari , Mehdi Gharib , Nima Ranjbar Malidarreh , Mojtaba Esmaeilnia Amiri , Saman Soleimani Kutanaei

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引用次数: 0

Abstract

This study investigates the self-healing behavior and strength development of silty sand stabilized with two natural biopolymers: Persian gum (PG), a plant-based biopolymer with a relatively linear structure, and Xanthan gum (XG), a microbially derived biopolymer with a branched molecular structure. The biopolymers were used at contents of 0.5 %, 1 %, and 2 % by dry weight of soil. Cylindrical samples were cured under different conditions and then intentionally damaged to evaluate healing after 7, 28, and 90 days. Mechanical performance was assessed using unconfined compressive strength (UCS) and ultrasonic pulse velocity (UPV), and microstructural changes were examined via SEM and AFM. Results showed that the highest strength gains occurred with 2 % biopolymer content after 28 days of curing. UCS reached 950 kPa for PG and 1193.6 kPa for XG. XG-stabilized samples showed greater healing capacity (38 % UCS recovery after 90 days) but also higher strength loss over time. PG, while offering slightly lower strength, provided more stable performance and lower sensitivity to moisture-induced damage. A strong correlation (R² = 0.9561) was observed between UCS and UPV, confirming UPV as a reliable non-destructive method for assessing self-healing. Overall, PG is proposed as a sustainable and effective alternative for long-term stabilization of silty sands.

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生物聚合物稳定粉砂自愈过程及强度的研究：黄原胶与波斯胶在岩土工程中的比较

本研究研究了两种天然生物聚合物稳定粉砂的自愈行为和强度发展：波斯胶（PG）是一种基于植物的具有相对线性结构的生物聚合物，黄原胶（XG）是一种来自微生物的具有分支分子结构的生物聚合物。生物聚合物的含量分别为土壤干重的0.5%、1%和2%。圆柱形样品在不同条件下固化，然后在7、28和90天后故意破坏以评估愈合情况。采用无侧限抗压强度（UCS）和超声脉冲速度（UPV）评估力学性能，并通过扫描电镜（SEM）和原子力显微镜（AFM）检测微观结构变化。结果表明，当生物聚合物含量为2%时，固化28天后强度增益最高。PG的UCS为950 kPa， XG为1193.6 kPa。xg稳定的样品显示出更大的愈合能力（90天后恢复38%的UCS），但随着时间的推移，强度损失也更高。虽然PG的强度略低，但性能更稳定，对湿气损伤的敏感性更低。在UCS和UPV之间观察到很强的相关性（R²= 0.9561），证实UPV是评估自我修复的可靠的非破坏性方法。总的来说，PG被认为是粉质砂长期稳定的可持续有效的替代方案。

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来源期刊

Carbohydrate Polymer Technologies and Applications

CiteScore

8.70

自引率

0.00%

发文量