EXPERIMENTAL INVESTIGATION FOR STABILIZATION OF BLACK COTTON SOIL BY USING LIME AND BRICKDUST WASTE
Publication Date : 07/09/2017
The objective of this project is to stabilize the Black Cotton soil (BC Soil) as it is proved to be the poorest soil among all soils and also it is an expansive soil. Expansive soils are avoided from using in pavement construction. If used, it will damage the pavements adversely when compared to other soils. Thus, worldwide these soils are considered to be problematic soils and pose several challenges for engineers. So, as to utilize these soils in an effective way, proper treatment to the soil is required. Stabilization of soils is an effective method for improvement of soil properties and the pavement system performance. With the same intention, an attempt is made to modify engineering properties of black cotton soils collected in Visakhapatnam city, Andhra Pradesh, India by using demolished structure materials such as brick powder waste and Lime. An experiment investigation is carried out to study the effect of brick powder and lime on engineering and strength properties of the black cotton soils. The properties of stabilized soil such as Waterberg limits, compaction characteristics and California bearing ratio and their variations with content of brick powder and lime were evaluated. Laboratory studies to investigate the possibility of utilizing brick powder and lime as stabilizing materials to improve the engineering properties of black cotton soil was carried out. Black cotton soil is classified as A-7-5 in accordance with HRB soil classification system. The results obtained show that the moisture density relationship follows a trend of decreasing optimum moisture content (OMC) and increasing maximum dry density (MDD) is the modified proctor test. The CBR value of BC soil obtained was only 1% and this low strength value is improved to minimum requirement of 8% CBR according to IRC: 37-2012. Test results indicate that CBR value of soil increases with increase in BP and lime content. Addition of optimum percentage of brick powder (50%) and optimum percentage of lime (4%) and optimum percentage of its combination (30%+1.5%) to the Black Cotton Soil has improved the strength characteristics BC soil 8% CBR. Thus, the significant increase in CBR value of soil stabilized with BP, lime and BP + Lime will substantially reduce the thickness of the pavement sub grade.
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