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首页> 外文期刊>Applied clay science >Experimental study on instability of bases on natural and lime/cement-stabilized clayey soils
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Experimental study on instability of bases on natural and lime/cement-stabilized clayey soils

机译：天然和石灰/水泥稳定黏土土壤基层不稳定性的试验研究

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In many sub-tropical and tropical arid regions of the world, marly soils (marls) and lime or cement stabilization of marl soils are used as a convenient and expedient means of developing foundation base courses and inexpensive wearing courses for transport purposes. The failure of many of these natural and stabilized marls to perform their function has been reported. Mechanical factors, commonly used to explain the causes of the foundation failures, are unsatisfactory and have not been accepted. This study uses physicochemical (reaction) factors to explain the general basic causes of the deterioration of support capability for these types of soils. The presence of palygorskite and sepiolite in marl soil provides it with some very unique features in its natural state, particularly when it is stabilized with lime or cement. The formation of an expansive mineral, ettringite, as a transformation product of palygorskite increases the swelling potential of the stabilized soil. A set of physico-chemical and mechanical experiments, which include slake durability, specific surface area measurement (SSA), California bearing ratio (CBR), atterberg limits testing, and X-ray diffraction (XRD), were performed. In addition, the impact of curing on the stabilized soil behaviour was investigated. The results show that the immersion of the natural marl reduces the dry CBR value to at least one-fourth the dry value. Furthermore, the XRD results indicate that with increasing time and availability of dissolved aluminum and sulfate, ettringite forms in stabilized soil and then the rate of ettringite growth increases. Based on the findings of these experiments, the various interactions, reactions and factors contributing to the stability and instability of marl soils, and lime/cement stabilized marls are discussed. It is concluded that the general traditionpl soil stabilization evaluation methods are not capable of accounting for the failures that occur in stabilized marl. It is shown that soil mineralogy and pore fluid analysis, in conjunction with X-ray diffraction testing, can be combined to provide a set of practical ways to monitor the possibilities of these failures.
机译：在世界上许多亚热带和热带干旱地区，灰泥土（石灰石）和石灰或水泥稳定的泥灰土被用作开发便捷的基础方法和用于运输目的的廉价磨损法的便捷手段。据报道，许多这些自然的和稳定的泥土无法执行其功能。通常用于解释基础破坏原因的机械因素并不令人满意，因此未被接受。这项研究使用理化（反应）因素来解释这些类型土壤的支撑能力下降的一般基本原因。泥灰土中坡缕石和海泡石的存在使其在自然状态下具有一些非常独特的特征，尤其是当用石灰或水泥稳定时。作为坡缕石的转化产物，膨胀矿物钙矾石的形成增加了稳定土壤的溶胀潜力。进行了一系列物理化学和机械实验，包括耐久性，比表面积测量（SSA），加利福尼亚轴承比（CBR），阿特伯格极限测试和X射线衍射（XRD）。另外，研究了固化对稳定的土壤性能的影响。结果表明，将天然泥灰浸入会使干CBR值降低至干值的至少四分之一。此外，X射线衍射结果表明，随着时间的延长以及溶解的铝和硫酸盐的有效性，钙矾石在稳定的土壤中形成，然后钙矾石的生长速率增加。根据这些实验的结果，讨论了影响石灰岩土壤和石灰/水泥稳定石灰石的稳定性和不稳定性的各种相互作用，反应和因素。结论是，一般的传统土壤稳定性评估方法不能解决稳定泥灰岩中发生的破坏。结果表明，土壤矿物学和孔隙流体分析与X射线衍射测试相结合，可以提供一套实用的方法来监测这些破坏的可能性。

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