Study on utilization of fly Ash in Bitumen and in Flexible Pavements

The basis of the thesis was to find out the change in the physical properties of the bitumen by modifying it with fly ash. Different percentage of fly ash was used to modify the bitumen. Various physical tests were conducted on virgin and modified bitumen to evaluate its physical properties. Marshall Test was conducted on bituminous mix prepared using modified and unmodified bitumen and the results were analyzed and compared.The study indicated that increase in the percentage of fly ash improves the physical properties of virgin bitumen. Further it also indicated that increase in the percentage of fly ash improves Marshall Stability and flow values in the bituminous mix.The objective of this study is to investigate the effect of fly ash as a filler replacement on the mechanical properties of asphalt'“aggregate mixtures. Utilization of fly ash, which is the by-product of coal-fired power generation, is of great importance from an environmental and economical point of view. In this study, a dense bituminous mixture composed of calcareous aggregate was selected as the reference mixture. It was observed that there was a definite increase in Marshall Stability and decrease in flow values, especially when calcareous filler was replaced by Soma-type fly ash, which was one of the three types of fly ashes used. The mechanical properties, namely elastic strain, elastic modulus, and permanent strain, of the asphalt mixtures were determined by carrying out fatigue tests with a UMATTA tester for three types of fly ashes, portland cement, lime, and control specimens. The changes in mechanical properties are important in the sense that they affect the behavior of asphalt concrete pavement under applied loads. This mechanism can be explained basically by bitumen extension. The fatigue life of fly ash specimens, especially Soma fly ash, was found to be considerably higher than that of calcareous filler specimens. Based on this study, it is demonstrated that fly ash can be used effectively in a dense-graded wearing course as a filler replacement. Abdula Zain Ul Aabideen Dar | Mohd Zeeshan Khan"Study on utilization of fly Ash in Bitumen and in Flexible Pavements" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, URL: http://www.ijtsrd.com/papers/ijtsrd11056.pdf http://www.ijtsrd.com/engineering/civil-engineering/11056/study-on-utilization-of-fly-ash-in-bitumen-and-in-flexible-pavements/abdula-zain-ul-aabideen-dar