Utilization of Coal Mixed Waste Aggregates Available at Thermal Power Plants for GSB and Asphalt Mixtures

During the last two decades the infrastructure and construction sector has put its leg forward towards growing economy of country. The road and transportation sector are one of the most valuable and important amongst all others. The road sector provides connectivity of the growing cities and villages with the developed cities. For the road sector it costs minimum about a crores rupee for construction and maintaining a section of one kilometer road during its life span. India has about 4.6million kilometers of roads and still the infrastructure of roads is yet to be constructed and maintained. One of the problems in our country is to have quality roads in cities and villages to have better connectivity. Some of the villages have no roads and for that the inefficiency of the system prevailing including the engineers is blamed. The growing scarcity of natural aggregates, due to banning of quarries, leading to slowing down the rate of road construction is also a problem. An alternate for this problem is Coal Mixed Reject. The coal from coal mines is supplied to the thermal power plants for electricity production which contains both coal and stones. The material which contains less percentage of coal content in them is rejected. We have utilized this waste aggregate as a replacement of natural aggregate in Granular Sub-Base (GSB) and bituminous layers in road construction. Based on laboratory studies like proctor test, CBR test for GSB layer and mechanical strength parameters like rutting, fatigue, stability for bituminous layers, it is recommended for its use as an alternative to natural aggregate in road construction works.