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<p>This paper assesses the performance of biopolymers (agar gum and guar gum) for soil stabilization and the self-healing properties of these materials using non-destructive ultrasonic pulse velocity (UPV) and unconfined compressive strength (UCS) tests. Scanning electron microscopy (SEM) tests were performed to investigate the microstructure of the stabilized soil during the self-healing process. The results showed that adding biopolymers to the soil significantly improved the soil’s mechanical properties and self-healing properties. The self-healing indexes of sandy soil stabilized with 1% of guar gum and agar gum were 45% and 18%, respectively, at the curing time of 14&#xa0;days. Increasing the internal bonds and reducing cracking caused by hydrogel swelling are the significant advantages of using biopolymers in soil stabilization. The UPV provides a quick and accurate estimate of changes in the properties of the stabilized soil. The UPV of the samples increased after the self-healing period. The UPV of the sandy soil stabilized with 1% guar gum and agar gum increased by 17% and 13%, respectively, at the curing time of 7&#xa0;days. The SEM results showed that the swelling of biopolymers led to crack repair after the self-healing period, the creation of new bonds between grains, and the increase of the contact surface of soil particles.</p>

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Multiscale Investigation of Self-healing Behavior of Sand and Silty Sand Stabilized with Guar Gum and Agar Gum

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Parviz Maleki,
  • Mehdi Gharib,
  • Saman Soleimani Kutanaei,
  • Hossein Ghasemnejad,
  • Nima Ranjbar Malidarreh

摘要

This paper assesses the performance of biopolymers (agar gum and guar gum) for soil stabilization and the self-healing properties of these materials using non-destructive ultrasonic pulse velocity (UPV) and unconfined compressive strength (UCS) tests. Scanning electron microscopy (SEM) tests were performed to investigate the microstructure of the stabilized soil during the self-healing process. The results showed that adding biopolymers to the soil significantly improved the soil’s mechanical properties and self-healing properties. The self-healing indexes of sandy soil stabilized with 1% of guar gum and agar gum were 45% and 18%, respectively, at the curing time of 14 days. Increasing the internal bonds and reducing cracking caused by hydrogel swelling are the significant advantages of using biopolymers in soil stabilization. The UPV provides a quick and accurate estimate of changes in the properties of the stabilized soil. The UPV of the samples increased after the self-healing period. The UPV of the sandy soil stabilized with 1% guar gum and agar gum increased by 17% and 13%, respectively, at the curing time of 7 days. The SEM results showed that the swelling of biopolymers led to crack repair after the self-healing period, the creation of new bonds between grains, and the increase of the contact surface of soil particles.