Effects of Fly Ash as Filler on Asphalt Concrete Mix Design
Abstract
The study represented the application of fly ash in asphalt concrete mix and investigated effects of fly ash content on Marshall mix design using 50/70 penetration grade bitumen with 0%, 2%, 2.5% and 3% of fly ash content as filler. The marshal stability increased with increased in fly ash while voids in mineral aggregates, flow and air voids decreased with increased in fly ash. 3% of fly ash content has maximum stability of 13.82 KN and corresponding flow value, air voids and voids filled with mineral aggregates are 1.9mm, 4.12% and 14.31% respectively. Results showed that fly ash has more beneficial that enhanced rheological properties in asphalt concrete mixture. In addition, modified mix with fly ash outperformed better than normal conventional mix. Further, an alternative of using fly ash as filler can be ascertained to improve the normal asphalt mix design.