USE OF CONSTRUCTION & DEMOLISHED WASTE MATERIALS IN NON-BITUMINOUS LAYERS

Abstract

Clayey soils cover approximately 20% of the total area of India in the central and western parts. Its high swelling and shrinkage characteristics have been a challenge to the highway engineers for pavement construction. For sites where clayey soil is profusely found, practically it is very difficult to deal such extreme situation without employing suitable soil stabilization techniques. Soil stabilization can be achieved by pulverizing the natural soil or borrow material, mixing in a chemical additive, and thoroughly compacting the mixture. Generally, additives used were either Portland cement, lime or salt (sodium chloride). The effectiveness of stabilization depends upon the ability to obtain uniformity in blending the various materials. The method of soil stabilization is determined by the amount of stabilizing required and the conditions encountered on the project. An accurate soil description and classification is essential to the selection of the correct materials and procedures. In the present study, effort was made to stabilize the clayey soil found in nearby local area of Roorkee city using material passing 1.18 mm IS sieve size obtained from laboratory waste crushed concrete cubes (FLW) and demolished road waste(FRW). In addition to this material, ordinary Portland cement was also considered as a base binder for the purpose of comparison. FLW, FRW and OPC were admixed at equal interval of 3% upto 15% by weight of dry soil. Based on the study carried out in the laboratory, it was found that soaked CBR values, unconfined compressive strength and split tensile strength of clayey soil increases considerably in addition of FLW, FRW and cement. Admixing of FLW, FRW and cement leads to dramatic change in plasticity index. FE SEM examination conducted on soil samples with or without FLW, FRW& cement explained well the mechanism of hydration taken placed within the soil mixture system. It is noticeable that the influence of FLW and FRW on the mechanical properties of clayey soils was dominantly affected by the FLW and FRW dosage. Keywords: Construction & Demolition waste (C&D), Recycled fine material, California bearing ratio (CBR), and unconfined compressive strength (UCS). iii