ASPHALT CONCRETE PERFORMANCE ANALYSIS BY USING WASTE TIRE AS A PARTIAL REPLACEMNT OF ASPHALT BINDE

For a country like Ethiopia, an efficient road network is necessary for national integration, industrial and socio-economic development. Due to improvement in living standards of the people, the use of vehicles has increased drastically over the last few years. The importance of road transport over other forms of land transport rise because the rapid growth of the population of the country and migration from rural to urban area has led to increase in traffic volumes and road building activities. Waste tires are tires that completed their service life and they come mostly from passenger cars and trucks. Now a days the large volume of waste tires rubber becomes worldwide serious problem that affect the environment. The use of recycle waste tire as a replacement of asphalt binder for asphalt pavement has been investigated in this research. The study compares bitumen binder and binder modified by Waste Tire using laboratory tests including rheological, conventional test and Marshall Flow and stability with corresponding volumetric properties. Including the control specimen five binders were obtained by mixing the asphalt binder with four different percentages of Waste Tire by weight of asphalt binder (10%, 20%, 25% and 30%) for rheological test and for conventional and marshal test used three sample excluding the control specimen (20%, 25% and 30%). The rheological binder tests were conducted using a Dynamic Shear Rheometer. Those tests are; Amplitude Sweep Test, used to determine the Linear Visco-Elastic Range of the binders at which the temperature ranges from10Co to 54.4 C° with constant frequency which is 10rad/s. Frequency Sweep Test, used to develop the master curve and determine the rheological properties of the binders over a wide range of temperatures and frequencies. Performance Grade is done to find out the performance grades of the binder at higher temperature. Multi-Stress Creep and Recovery test has done to determine the rutting parameter (Jnr) and percentage recovery of the binder. Other tests like conventional tests are performed to check the effects of Waste Tire in penetration, ductility, softening point and flash point tests. Marshall Mix design also performed to quantify the Optimum Binder Content in the asphalt mixture. In order to check the economic feasibility of partial replacement of bitumen binder by waste tire a simple economic analysis was done and according to the result found, it is economical to use waste tire as a partial replacement of bitumen binder. From amplitude sweep test the proportion of waste tire increased from 10% to 20% the linear visco elastic range increased with temperature whereas further increased waste tire from 20% to 30% th