APRAISAL OF DEMOLISHED CONCRETE COARSE AND FINES FOR STABILIZATION OF CLAYEY SOIL

Road pavements or structure on loose soil needs stabilization. Soil stabilization is mainly done for modifying soil engineering properties to improve the bearing capacity and durability property of weak soil. At the same time the waste material disposal is possessing a lot of problem for disposal. The aim of the study is to appraise the waste material with a review on stabilization of clayey soil using demolished concrete structural fines. Various methods are available for stabilizing clayey soil. These methods include stabilization with chemical additives, soil replacement, compaction control, moisture control and thermal methods. Based on literature reviews and use of demolished waste issues, fines obtained from demolished waste is a low cost and effective soil stabilization method. This dissertation presents the results of a study that investigated the use of demolished concrete in the stabilization of expansive clayey soil. The demolished waste is crushed into fines and coarse materials and grading of fines is done to know the properties of demolished fines and there suitability as a stabilization material. The soil has been stabilized with 0.5%, 10% and 25% of demolished concrete fines and coarse. The final mixtures were tested: Moisture Content Atterberglimits, Compactionand California Bearing Ratio Unconfined Triaxial test. Results indicates that demolished concrete content increases, maximum dry density decrease while CBR values tend to increase. Thus, demolished concrete could potentially act similar to lime or cement in improving the properties of clayey soils. Finally it is concluded that the specific gravity increases with increase in amount of stabilizer. Plasticity index of soil decrease with increase in amount of stabilizer. The maximum dry density increases, and the optimum moisture content decreases with increasing the concrete content in the mixture. The CBR values of the mixtures increases with increasing the recycled concrete content in the mixture. Using C&D waste in soil stabilization helps to reduce the hazardous environmental impacts of the waste and improves the engineering properties of soil which ultimately reduces the cost of construction and increases the life of the structure built on stabilized soil