Some studies on the effect of fly ash and lime on physical and mechanical properties of expansive clay
Some studies on the effect of fly ash and lime on physical and mechanical properties of expansive clay
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DOI：
10.22068/ijce.13.3.203
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发表时间：
2015-12
影响因子：
1.7
通讯作者：
B. Mir
中科院分区：
文献类型：
--
作者：
B. Mir
粉煤灰是最丰富、用途最广泛的工业副产品之一。目前，印度每年产生近1.5亿吨粉煤灰，造成环境污染和处置困难的双重问题。这就需要制定有效且高效地使用相同策略的策略。然而，它仅在岩土工程应用中，例如筑堤/堤坝、作为回填材料、作为底基层材料等，才可能单独或与土壤一起大规模利用。土壤稳定可以通过多种方式实现，例如压实、换土、化学改良、土加固等。通常，对于粘土，化学改良通常是最有效的，因为它可以加固土壤，消除其对水的敏感性及其随后的应力历史。在化学方法或添加剂中，粉煤灰/石灰提供了一种经济而有力的改进方法，与重粘土混合时明显的显着转变就证明了这一点。在本次调查中，按天然土壤的干重计算，将不同百分比的飞灰（10％、20％、40％、60％和80％）添加到来自印度的高膨胀土壤中，并进行了各种测试。在许多岩土应用中使用粉煤灰所需的重要特性是指数特性、压实特性、压缩特性、渗透性和强度。根据试验结果，发现使用粉煤灰改良土壤具有双重优势。首先，避免大规模倾倒粉煤灰造成的巨大环境问题；其次，降低问题/边缘土壤的稳定成本并改善其工程性能，以确保工程结构的安全施工。
Fly ash is one of the most plentiful and versatile of the industrial by-products. At present, nearly 150 million tonnes of fly ash is being generated annually in India posing dual problem of environmental pollution and difficulty in disposal. This calls for establishing strategies to use the same effectively and efficiently. However, it is only in geotechnical engineering applications such as the construction of embankments/dykes, as back fill material, as a sub-base material etc., its large-scale utilization is possible either alone or with soil. Soil stabilization can be achieved by various means such as compaction, soil replacement, chemical improvement, earth reinforcement etc. Usually, in the case of clay soils, chemical improvement is commonly most effective since it can strengthen the soil, to remove its sensitivity both to water and its subsequent stress history. Among chemical means or additives, fly ash/lime provides an economic and powerful means of improvement, as demonstrated by the significant transformation that is evident on mixing with heavy clay. In the present investigation, different percent fly ashes (10%, 20%, 40%, 60% & 80%) were added to a highly expansive soil from India by dry weight of the natural soil, and subjected to various tests. The important properties that are necessary for using fly ash in many geotechnical applications are index properties, compaction characteristics, compressibility characteristics, permeability and strength. Based on test results, it has been found that using fly ash for improvement of soils has a two-fold advantage. First, to avoid the tremendous environmental problems caused by large scale dumping of fly ash and second, to reduce the cost of stabilization of problematic/marginal soils and improving their engineering properties for safe construction of Engineering Structures.