Use of Burnt Municipal Solid Waste and Lime in Local Subgrade Soil Stabilization for its Use in Low Traffic Volume Roads

Increased human activity and urban agglomeration have, of late added critical dimensions to environmental planning and solid waste management. The present day conventional practices of on-site-land disposal method of municipal solid wastes (MSW) are creating environmental pollution and health hazards. MSW generated from the house holds of Warangal city in the burnt form is taken for demonstration and investigative study for its use in stabilization of local subgrade soils. A comprehensive data collection through primary house-hold survey using a structured questionnaire is conducted on residential waste, collection, transportation, disposal for its quantification and characterization. Waste samples were collected from the disposal site and is analyzed for their engineering properties in un-burnt and burnt forms. Sub grade soil samples from a rural area near Chintagattu village in Warangal District of Telangana State in India were collected and are examined for its compaction characteristics, CBR value and strength characteristics. Laboratory experimental investigations are carried for the use of Burnt Municipal Solid Waste (BMSW) in local subgrade soil stabilization in presence of lime. Optimum percentage of lime is arrived at based on un confined compressive strength(UCS) and CBR value criteria. Experimental, investigations are carried on local subgrade soil, soil-lime mix and soli-lime- BMSW mix for assessing the engineering properties and their use in construction of secondary roads. Experimental investigation results are encouraging and revealed that local soils can be stabilized by using BMSW ash (20%) in presence of lime(4%) for the significant improvement in strength and reduction in pavement overlay thickness up to 30%.