Comparative Evaluation of Micro-Metakaolin and Ferric Chloride Solution in Stabilizing Expansive Soils

IF 1.3 Q3 ENGINEERING, GEOLOGICAL

Proceedings of the Institution of Civil Engineers-Ground Improvement Pub Date : 2022-08-11 DOI:10.1680/jgrim.21.00015

M. Sakr, Wasiem R. Azzam, M. Meguid, Asaad F. Hassan, Hebatalla Ghoneim

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引用次数: 0

Abstract

Expansive soils are generally characterized by their volume change when subjected to variation in water content. This may result in significant damage to supported and nearby structures. In this study, the swelling properties of bentonite material as an expansive soil are first determined. The expansive soil is then improved using two different approaches, namely, micro-metakaolin and ferric chloride solution. The optimum percentage for both additives are determined using laboratory experiments. These percentages are found to be 25% and 1% for the micro-metakaolin and the ferric chloride solution, respectively. The free swell index of the bentonite after being treated with micro-metakaolin and ferric chloride solution at the optimum percentages are found to decrease by about 54% and 62%, respectively. Meanwhile, the swelling pressure for the expansive soil decreased by 33% and 43% when mixed with the same optimum values of micro-metakaolin and ferric chloride solution, respectively. Based on the results obtained in this study, the addition of ferric chloride solution achieved better results compared to micro-metakaolin. This improvement technique may be used to enhance the properties of expansive soils that support different construction engineering projects.

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稳定膨胀土中微量偏高岭土与氯化铁溶液的对比评价

膨胀土的一般特征是在含水量变化时其体积发生变化。这可能会对支撑和附近的结构造成重大损害。本研究首次确定了膨润土材料作为膨胀土的膨胀特性。然后采用微偏高岭土和氯化铁溶液两种不同的方法对膨胀土进行改良。通过实验室实验确定了两种添加剂的最佳配比。对于微偏高岭土和三氯化铁溶液，这些百分比分别为25%和1%。微偏高岭土和氯化铁溶液在最佳配比下处理后，膨润土的自由膨胀指数分别降低了54%和62%左右。同时，当掺加相同最佳值的微偏高岭土和氯化铁溶液时，膨胀土的膨胀压力分别降低33%和43%。从本研究得到的结果来看，与微量偏高岭土相比，氯化铁溶液的添加效果更好。这种改良技术可用于提高不同建筑工程中膨胀土的性能。

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.