Authors: G.Srikanth, Assistant Professor M.Harish Kumar
Abstract: Since the subgrade is the bedrock upon which the pavement model is built, its behaviour is crucial to the design of flexible road projects. Therefore, pavement performance and design analysis need a considerable deal of attention. The expansive soils include a high concentration of clay and silt, hence it is necessary to stabilise or compact the soil subgrade prior to building a flexible pavement. Subgrade soil replacement is the method of choice for stabilising certain types of soils. Fly ash, an industrial waste product, is currently being used in around 55% of its total capacity. Substituting bitumen-coated chicken mesh with fly ash in subgrade at varying percentages and layering the mesh appropriately will make good use of the fly ash. A better California bearing ratio can be achieved by using bitumen-coated chicken mesh as extra reinforcement. This study utilises the CBR mould to impact fly ash samples till they reach their maximum dry density and optimal moisture content. The samples are then used with or without bitumen coated bamboo meshes and chicken mesh layers. Dimensions of the chicken mesh match those of the CBR mould in plan view. It was thereafter covered with chicken mesh after being placed in the preparations of 1, 2, 3, and 4 layers. The laboratory tests show that the mixture with four layers of bitumen-coated chicken mesh and a 15% substitution of fly ash has the highest CBR value, indicating that it is very strong. The soil's moisture content is lowered by using plastic garbage as a partial replacement. In this study, various percentages of plastic garbage are introduced to soil in order to quantify and compare the values of UCS, CBR, MDD, and OMC with the unmodified soil.
