Improving the Performance of Asphalt Mixtures Using Nano Silica

Authors- Simpi Kumari, Professor Rajesh Kumar Misra, Professor Dr. Abhay Kumar Jha

Abstract-Black-top asphalts face challenges, particularly cracking and rutting. These issues arise within the asphalts due to deficiencies in mix properties and increasing traffic loads. They occur as a result of insufficient black-top coverage and blend quality. This paper focuses on enhancing the qualities of black-top mixes using Nano Silica (NS). The research involves analyzing the properties of modified mixes with NS at concentrations of 3%, 5%, 7%, 9%, and 11% by weight of bitumen. Marshall tests, retained Marshall tests, Indirect Tensile Strength (ITS) tests, as well as penetration and softening point tests are used to evaluate the properties obtained. Results indicate that the optimal NS content is 7% by weight of bitumen. Modifying the black-top mix with 7% NS increases the Marshall strength by 32.42%, decreases penetration by 7.93%, and raises the softening point by 10.34%, while maintaining similar unit weight and keeping air voids and other mix properties within acceptable limits. Overall, the addition of NS successfully enhances the characteristics of black-top mixes.

DOI: /10.61463/ijset.vol.12.issue5.285