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Analysis of Strength Development and Soil–Water Characteristics of Rice Husk Ash–Lime Stabilized Soft Soil

机译：稻壳灰石灰稳定软土强度发展及水土特性分析

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摘要

With increased awareness of environmental protection, the output of traditional curing agents such as cement and lime is less and less, so it is urgent to develop new curing agents with high efficiency and environmental benefits. Thus, this study aims at investigating the application of rice husk ash (RHA) from agricultural waste to the soft soil stabilization. A series of tests are conducted to analyze the strength development process and soil–water characteristics of rice husk ash–lime (RHA–lime) stabilized soils. The results of the strength tests showed that by increasing the content of RHA, the unconfined compressive strength (UCS) and splitting strength of stabilized soils increased first and then decreased. The effective shear strength indexes of the three soil types (soft soil, lime-stabilized soil, and RHA–lime soil) are measured and compared. It is found that RHA can effectively improve the shear resistance and water resistance of stabilized soil. The results of methylene blue test demonstrated that RHA can also promote the reduction of the specific surface area and swelling potential energy of lime-stabilized soil. In addition, the influence of RHA on mineral composition and morphology change in stabilized soils is studied at the microscopic level. The X-ray diffraction tests and scanning electron microscope (SEM) tests showed that strength development and change of soil–water properties of RHA–lime stabilized soil are attributed to enhanced cohesion by cementation and pores filling with agglomerated mineral.
机译：随着环保意识的增强，水泥，石灰等传统固化剂的产量越来越少，因此迫切需要开发出高效，环保的新型固化剂。因此，本研究旨在调查稻壳灰（RHA）从农业废料到稳定软土的应用。进行了一系列测试，以分析稻壳灰-石灰（RHA-石灰）稳定土的强度发展过程和土壤-水特征。强度测试结果表明，通过增加RHA的含量，稳定土的无边抗压强度（UCS）和劈裂强度先增大后减小。测量并比较了三种土壤类型（软土，石灰稳定土和RHA-石灰土）的有效抗剪强度指标。发现RHA可以有效地提高稳定土的抗剪强度和抗水性。亚甲蓝试验的结果表明，RHA还可以促进石灰稳定土比表面积的减少和溶胀势能。此外，在微观水平上研究了RHA对稳定土壤中矿物组成和形态变化的影响。 X射线衍射测试和扫描电子显微镜（SEM）测试表明，RHA-石灰稳定土壤的强度发展和土壤-水性质的变化归因于胶结作用和团聚矿物质填充孔隙的增强内聚力。

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