ABSTRACT

In the present study, characterisation and quantitative microanalysis were identified for six expansive soils of which one is natural soil, i.e. black cotton (BC) soil and remaining soils were prepared by mixing of BC soil with different percentage of bentonite. The BC soil and prepared soil samples were characterised by the X-ray diffraction (XRD) and scanning electron microscope (SEM). The regular or irregular mixed layers of soils justified by SEM images. There are superstructures whose spacing can simply be described as the ratio of BC soil and prepared soil. d-Spacing was calculated by Bragg’s formula (XRD) which was observed by joint committee on powder diffraction standards card and calculated by Bragg’s equation for h-k-l plane for expansive soils and it was observed that d-spacing decreased with increasing prepared soil combination. Moisture content was taken below optimum moisture content, i.e. 15%, 17% and 20% to determine swelling and swelling pressure and found that montmorillonite mineral affects the swelling characteristics of expansive soils.

摘要

在本研究中，对六种膨胀土壤进行了表征和定量微分析，其中一种是天然土壤，即黑棉（BC）土壤，其余土壤是通过将BC土与不同比例的膨润土混合而制备的。通过X射线衍射（XRD）和扫描电子显微镜（SEM）对不列颠哥伦比亚省的土壤和制备的土壤样品进行了表征。SEM图像证明土壤的规则或不规则混合层是合理的。有些上层建筑的间距可以简单地描述为BC土与准备土的比率。d-间距是通过Bragg公式（XRD）计算得到的，该公式由联合委员会在粉末衍射标准卡上观察到，并通过Bragg方程针对hkl平面计算出膨胀土的d-间距，并且观察到d-间距随着增加的预制土壤组合而减少。