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首页> 外文期刊>Arabian journal of geosciences >Swelling characteristics and shear strength of highly expansive clay-lime mixtures: A comparative study
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Swelling characteristics and shear strength of highly expansive clay-lime mixtures: A comparative study

机译：高膨胀粘土-石灰混合物的溶胀特性和剪切强度：对比研究

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Expansive soil is considered a potential natural hazard, which can cause extensive damage to structures if not adequately treated. One of the mitigation techniques of such soil is to mix it with lime. This paper aims to study the effect of the limestone and hydrated lime on the behavior of the highly expansive clay. Ca bentonite is used as the highly expansive clay. The bentonite has been mixed with lime in varying amount ranging from 0 to 10 %. Each bentonite-lime sample was remolded at modified AASHTO density and optimum moisture content. Four series of tests were performed on each mixture included: swelling potential, swelling pressure, California bearing ratio (CBR), and unconfined compression strength test. The results of the study showed that mixing limestone and hydrated lime with expansive clay reduces swelling potential and swelling pressure. There is a further reduction in the swelling pressure and swelling potential with increasing lime percentage. But mixing hydrated lime with clay causes significant reductions in swelling potential and swelling pressure. The swell potential decreases from 34.5 to about 26.5 % and 1 % in case of clay sample mixed with 10 % limestone and 10 % hydrated lime, respectively. The non-treated bentonite implies high values of CBR and unconfined compressive strength. The limestone has a negative effect on the strength of the clay. While the hydrated lime causes increases in the strength of the clay. The strength of the clay-hydrated lime mixtures has further increases with increasing lime content and curing time.
机译：膨胀的土壤被认为是潜在的自然灾害，如果处理不当，可能会对建筑物造成广泛的破坏。这种土壤的缓解技术之一是将其与石灰混合。本文旨在研究石灰石和熟石灰对高膨胀粘土性能的影响。钙膨润土被用作高度膨胀的粘土。膨润土已与石灰混合，含量从0％到10％不等。以改良的AASHTO密度和最佳水分含量将每个膨润土-石灰样品重塑。对每种混合物进行了四个系列的测试，包括：膨胀潜力，膨胀压力，加利福尼亚承载比（CBR）和无极限压缩强度测试。研究结果表明，将石灰石和熟石灰与膨胀黏土混合可降低溶胀潜力和溶胀压力。随着石灰百分比的增加，溶胀压力和溶胀潜力进一步降低。但是，将熟石灰与粘土混合会导致溶胀潜力和溶胀压力显着降低。在粘土样品分别与10％石灰石和10％熟石灰混合的情况下，溶胀电势从34.5降至约26.5％和1％。未经处理的膨润土意味着高的CBR值和无限的抗压强度。石灰石对粘土的强度有负面影响。而熟石灰会增加粘土的强度。随着石灰含量和固化时间的增加，粘土水合石灰混合物的强度进一步提高。

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