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原文传递 STRENGTH CHARACTERISTICS OF STABILIZED SUBGRADE AND ITS ECONOMICS IN RURAL ROADS

题名：	STRENGTH CHARACTERISTICS OF STABILIZED SUBGRADE AND ITS ECONOMICS IN RURAL ROADS
正文语种：	英文
作者：	NAGRALE PRASHANT P; ATULYA PATIL
作者单位：	Prof. Department of Civil Engineering, Sardar Patel College of Engineering, Andheri (w), Mumbai - 58; Prof. Department of Civil Engineering, Datta Meger College of Engineering, Airoli, Navi Mumbai
关键词：	economic；characteristics；soil；material；grade；optimization；structure；stab；parameter；reduce
摘要：	The long term performance of any construction project depends on the soundness of the under laying soils. Unstable soils can create significant problems for pavements or structures. Lack of adequate road network to cater to the increased demand and increase distress in road leading to frequent maintenance have always been big problem in our country. Evolving new construction materials to suit various traffic and site conditions for economic and safe design is a challenging task in road construction. Effective utilization of local weak soils by imparting additional strength using stabilization materials enable reduction in construction cost and improved performance for roads. Exploring the feasibility of such materials for sub grade and embankment stabilization will help the road building sector to evolve a stronger, durable and economic design. Aggregate is generally expensive therefore it is often important to minimize the aggregate layer thickness for a given service life. This can be achieved by incorporating stabilization technique. This stabilization technique can increase the service life for a given aggregate layer thickness or reduce the layer thicknesses for given service life. Therefore, parameters considered in a stabilization structure are service life, thickness of aggregate layer and types and properties of stabilizing materials. Present investigation is carried out to evaluate the benefits of stabilization in term of improvement in characteristic strength of subgrade soils, layer thickness reduction and pavement response leading to economical optimization of flexible pavement design. The purpose of this investigation was to study the variation in Dry Density, 4 days soaked CBR values, failure stress due to stabilization of two types of soil with different percentages of lime and fibers and decide the optimum lime and fiber content required for maximum benefits. Also, to study effect of optimum lime and fiber content on shear strength parameters. The test results indicate that there is an improvement in CBR and UCS values due to stabilization with lime and fibres. 4.5 % lime and 0.5 % fiber by weight of dry soil is found to be optimum quantity for maximum benefits for both subgrade soil - A and Soil - B. The economic analysis on lime and fiber stabilization shows that, if lime is used for stabilization of Subgrade soil - A and Soil - B the cost required for construction of pavements reduced by 37.45 % and 24.79 % respectively, whereas, if fiber is used for stabilization of Subgrade soil - A and soil - B, the cost required for construction is reduced by 23.42 % and 17.67 % respectively. It indicates, lime stabilization technique is more effective compared to fiber stabilization.
出版年：	2019
期刊名称：	Indian Highways
卷：	47
期：	12
页码：	38-45