A comparative study between strength and durability of bentonite and natural gum stabilised sand

IF 1.7 Q3 ENGINEERING, GEOLOGICAL Geomechanics and Geoengineering-An International Journal Pub Date : 2021-08-04 DOI:10.1080/17486025.2021.1961026

S. Alam, Assefa Weldu Gebremedhin, Hika Wachila Atomsa, Afzal Husain Khan

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引用次数: 2

Abstract

ABSTRACT The loss in strength of engineered geo-materials due to their exposure to adverse environmental conditions is a major problem and is investigated in terms of durability. In the present study, geo-materials are developed using the sand obtained from river Yamuna and is stabilised with bentonite or two different types of biopolymer (Guar gum and Xanthan gum) separately. The maximum percentage of bentonite is fixed as 25% by dry weight, whereas the biopolymer (0.5%, 1.0%, 1.5%, and 2.0%) is used by making its solution with distilled water. A continuous increase in the unconfined compressive strength is observed in the bentonite stabilised sand whereas an optimum percentage of both the biopolymers is observed as 1.5%. The penetration resistance is presented in term of CBR value and resilient modulus is calculated using the same. Although, the bentonite and Guar gum stabilised sand demonstrate higher strength compared to Xanthan gum stabilised sand; however, the former is not found stable when submerged in water. More than 50% loss in strength for sand stabilised with 1.5% and 2.0% Xanthan gum is observed. Further, the stability of the biopolymer stabilised sand in submerged condition is discussed with the help of SEM images.

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膨润土与天然胶砂强度和耐久性的比较研究

摘要工程土工材料由于暴露在不利的环境条件下而导致的强度损失是一个主要问题，并从耐久性方面进行了研究。在本研究中，土工材料是使用从亚穆纳河获得的沙子开发的，并分别用膨润土或两种不同类型的生物聚合物（瓜尔胶和黄原胶）进行稳定。膨润土的最大百分比固定为干重的25%，而生物聚合物（0.5%、1.0%、1.5%和2.0%）通过用蒸馏水制成溶液来使用。在膨润土稳定砂中观察到无侧限抗压强度的持续增加，而两种生物聚合物的最佳百分比均为1.5%。渗透阻力以CBR值表示，弹性模量使用CBR值计算。尽管如此，与黄原胶稳定的砂相比，膨润土和瓜尔胶稳定的沙表现出更高的强度；然而，前者在水中浸泡时并不稳定。观察到用1.5%和2.0%黄原胶稳定的沙子的强度损失超过50%。此外，借助SEM图像讨论了生物聚合物稳定砂在浸没条件下的稳定性。

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来源期刊

Geomechanics and Geoengineering-An International Journal ENGINEERING, GEOLOGICAL-

CiteScore

3.80

自引率

0.00%

发文量

期刊介绍： Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.