Abstract
Expansive soil is prone to large volume changes (swelling and shrinking) that are directly related to changes in moisture. So the low bearing strength and high compressibility behavior of soil can cause severe damage to subgrade. In this research the enumeration of the strength of soil by adding different types of ground improvement materials like as fly ash and bagasse ash in order to overcome such type of damages. The California Bearing Ratio (CBR) test to determine the stability of subgrade soil by adding fly-ash and bagasse ash separately at different percentages. The objective of this paper is to study the combined effects of Fly Ash and Bagasse Ash on Maximum Dry Density (MDD), Optimum Moisture Content (OMC), Soaked CBR and Swelling pressure of expansive soil. The effects of molding water content and compaction delay, on soaked CBR of both Ashes stabilized expansive soil have also been studied. CBR tests were performed with fly-ash and bagasse ash separately at different percentage variations with the increment of 2.5% by weight in order to find out which one is most suitable for stabilization of subgrade material. The results show that initially the optimum moisture content (OMC) of soil is 13.5% and for addition of fly ash and bagasse ash separately up to 12.5% it has become in increase up to 19.1% and 15.26% respectively. Initially the CBR value of soil is 6.63%. For addition of bagasse ash up to 10% the CBR value of soil has become in increase up to 13.87% and after then for addition of 12.5% bagasse ash it has become in decrease 13.42%. For fly ash the CBR value for 10% is 15.11%, which is larger than the bagasse ash.
Highlights
IntroductionSilt and clay are the three basic types of soil
Sand, silt and clay are the three basic types of soil
Fly ash was collected from the Bangladesh Barapukuria Power Station and sugarcane bagasse ash was collected from Rajshahi Sugar Mill
Summary
Silt and clay are the three basic types of soil. Clay soils are generally considered as "expansive soil”. During monsoon expansive soil absorb water and tend to expand in volume. In drier season like summer it will shrink because water is drawn away [1]. In semi-arid and arid regions of the globe, expansive soils are generally found which has destructive effect on the nature unless it is treated, causes huge damage to the structure built on it as well as loss of human life (Mohanty, 2015). The properties of soil can be improved by stabilization with admixtures such as lime; cement; fly ash; bagasse ash and cement kiln dust are used to improve the qualities of various types of soils such as Lateritic Soil [19], Clayey soil. In this research fly ash and bagasse ash are separately used for the purpose of stabilization of expansive soil
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
