C.B.R. IMPROVEMENT OF CLAYEY SOIL MIXED WITH LIME AND BAGASSE ASH by Sonam Kaur
Abstract
Clayey soil consists Illite mineral, which expands or shrinks when it comes in contact with moisture. Many cracks appear on the structure, which is founded on this type of soil. The clayey soil possesses low strength and excessive volume change. Civil Engineers face lot of problems in the field during and after construction of structure on clayey soil. Therefore, such soils needs to be stabilized before any construction on this type of soil. Various admixtures like lime fly ash, bagasse ash and cement commonly are being used for stabilization of clayey soil. In this work, strength of soil is improved by adding bagasse ash and lime. Effect of different mix proportions of lime and bagasse ash on compaction characteristics and strength properties as CBR of soil is observed in this study. The soil was stabilised with 3%, 5%, 7%, 9% of lime and 10%, 15%, 20%, 25% of bagasse ash. All stabilised sample was soaked for four days and then cured for 3 days. It observed that MDD decreased by 11% with increase of 7% lime and 20% BA. However, OMC increased from 16% to 19% and CBR increased from 2.5% to 14% with a combination of 7% lime and 20% BA. The CBR start decreasing with further increase of lime and bagasse. It is concluded that a optimum combination lime and bagasse ash can improve the strength (CBR) of clayey soil with medium plasticity. In the present study the flexible pavement was designed as per IRC 37: 2012, and observed that about 17% of total thickness of flexible pavement may be reduced if the clayey soil is stabilized with lime and bagasse ash. More over waste material like bagasse ash may be utilised in pavement effectively without detoriation of environment.
