A comparative study of stabilizing collapsible soil using different types of biopolymers

IF 1.3 Q3 ENGINEERING, GEOLOGICAL

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2023-01-18 DOI:10.1680/jgrim.22.00072

M. E. El Sawwaf, M. Shahien, A. Nasr, Mahmoud S. Habib

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引用次数: 5

Abstract

This article presents a comprehensive study of using xanthan gum, sodium alginate, and gelatin to stabilize collapsible soil. Modified Proctor, one-dimensional collapse, unconsolidated undrained triaxial, and California bearing ratio (CBR) tests were conducted to estimate the engineering characteristics of the untreated and treated soil. Additionally, X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests were utilized to demonstrate the changes in the microstructure of the treated samples. It was found that biopolymers decreased the maximum dry density and increased the optimum water content. The results also indicated that a 4% content of xanthan gum, sodium alginate, and gelatin significantly reduced the collapse index by 96%, 95%, and 82%, respectively. Shear tests showed that biopolymers slightly reduced the internal friction angle and significantly increased the cohesion intercept, which led to shear strength improvement. The results also indicated that 4% xanthan gum-treated samples, 4% sodium alginate-treated samples, and 4% gelatin-treated samples exhibited higher shear strengths by 145%, 106%, and 73%, respectively, than the untreated sample under the same conditions. The findings also indicated that when the soil was mixed with a 4% concentration of xanthan gum, sodium alginate, and gelatin, the unsoaked CBR value increased by about 185%, 157%, and 141%, respectively. The results of SEM and XRD studies also demonstrated the interaction between the fine-grained particles and the biopolymers.

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不同类型生物聚合物稳定湿陷性土壤的比较研究

本文介绍了黄原胶、海藻酸钠和明胶稳定湿陷性土壤的综合研究。通过改进的Proctor试验、一维坍塌试验、松散不排水三轴试验和加利福尼亚承力比(CBR)试验来评估未处理和处理土的工程特性。此外，利用x射线衍射(XRD)和扫描电子显微镜(SEM)测试来证明处理后样品的微观结构的变化。结果表明，生物聚合物降低了最大干密度，提高了最佳含水量。结果还表明，黄原胶、海藻酸钠和明胶含量为4%时，其崩塌指数分别显著降低96%、95%和82%。剪切试验表明，生物聚合物略微降低了内摩擦角，显著增加了黏聚截距，从而提高了抗剪强度。同样条件下，4%黄原胶处理、4%海藻酸钠处理和4%明胶处理样品的抗剪强度分别比未处理样品高145%、106%和73%。结果还表明，当黄原胶、海藻酸钠和明胶浓度分别为4%时，未浸泡的CBR值分别增加了约185%、157%和141%。SEM和XRD的研究结果也证实了细粒颗粒与生物聚合物之间的相互作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Proceedings of the Institution of Civil Engineers-Ground Improvement ENGINEERING, GEOLOGICAL-

CiteScore

3.10

自引率

8.30%

发文量

期刊介绍： Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.