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Engineering behavior of expansive soils treated with rice husk ash

机译：稻壳灰处理膨胀土的工程特性

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摘要

The rapid urbanization in Pakistan is creating a shortage of sustainable construction sites with good soil conditions. Attempts have been made to use rice husk ash (RHA) in concrete industry of Pakistan, however, limited literature is available on its potential to improve local soils. This paper presents an experimental study on engineering properties of low and high plastic cohesive soils blended with 0-20% RHA by dry weight of soil. The decrease in plasticity index and shrinkage ratio indicates a reduction in swell potential of RHA treated cohesive soils which is beneficial for problems related to placing pavements and footings on such soils. It is also observed that the increased formation of pozzolanic products within the pore spaces of soil from physicochemical changes transforms RHA treated soils to a compact mass which decreases both total settlement and rate of settlement. A notable increase in friction angle with increase in RHA up to 16% was also observed in direct shear tests. It is concluded that RHA treatment is a cost-effective and sustainable alternate to deal with problematic local cohesive soils in agro-based developing countries like Pakistan.
机译：巴基斯坦的快速城市化进程导致土壤条件良好的可持续建筑工地短缺。已经尝试在巴基斯坦的混凝土工业中使用稻壳灰（RHA），但是关于其改善当地土壤潜力的文献很少。本文介绍了以土壤干重计掺有0-20％RHA的低塑性和高塑性粘性土的工程特性的实验研究。可塑性指数和收缩率的降低表明RHA处理过的粘性土壤的溶胀潜力降低，这对于与在这种土壤上铺设人行道和立足点有关的问题是有益的。还观察到，由于物理化学变化，在土壤孔隙内火山灰产物的形成增加，将RHA处理过的土壤转化为致密的团块，从而降低了总沉降量和沉降速率。在直接剪切试验中还观察到摩擦角随RHA的增加而显着增加，达到16％。结论是，RHA处理是一种经济有效且可持续的替代方案，用于处理以农业为基础的发展中国家（如巴基斯坦）中存在问题的本地粘性土壤。

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