DefinePK

Abstract

Subgrade performance depend on its ability to support load which is often affected by optimum moisture content, and amount of compaction and the other most important factor is volume changes in subgrade when it is subjected to adverse conditions of environment for ex., extreme heating, excessive moisture and freezing temperatures. These changes are very well noticed in expansive soils generally termed as black cotton soils, contain montromillinite making the subgrade highly non workable. During the years it has been seen that with the growth of infrastructure has also led to the problem of disposal of waste materials such as Stone Dust and Rice Husk Ash. Most of the times in developing countries these waste materials are disposed in open and they mix with water land and air there by polluting the environment. But when observed carefully it has been seen that these materials are highly siliceous and prove to be cheaper material while used as additives together with cement and lime in subgrade soil stabilization for problematic expansive soils. This paper presents a study of effect of various curing periods on Soil-Lime-Rice Husk Ash, Soil-Lime-Stone Dust, Cement-Rice Husk Ash and Cement- Rice Husk Ash separately. It was seen from the results in all the mixes curing period has a considerable effect on strength of various mixes. This change was clearly visible when curing period of 7 days were compared with 28 days. All the analysis are well supported by scanning electron microscopy analysis.