Modification of mechanical properties of hot mix asphalt using fly ash

Subject Areas : Creep, Fatigue and Fracture Mechanic

Reza Samieifard ¹ , Mohamad Jafar Ostad Ahmad Ghorabi ²

1 - Energy and Sustainable Development Research Center, Semnan Branch, Islamic Azad University, Semnan, Iran
2 - Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran

Received: 2021-04-01 Accepted : 2021-08-22 Published : 2021-11-06

Keywords: Fly ash, Functional properties, Modified bitumen, Hot mix asphalt,

Abstract :

Fly ash is a by-product of the combustion process and consists of tiny components that are emitted by combustion gases. Fly ash has been widely used in the manufacture of concrete. The purpose of this paper is to determine the performance of fly ash as a filler in hot mix asphalt. In this study, fly ash additive with different amounts (FA-0, FA-2, FA-4, FA-6) according to the weight of stone materials, was used as a filler. Modified asphalt mixtures were tested for stability, flow, stiffness, moisture sensitivity and material loss (Cantabro loss). The results showed that the stability of asphalt mixtures containing fly ash is higher than conventional mixtures. In addition, the compounds contained in fly ash improved moisture resistance and durability. According to the results of the experiments, it can be concluded that the use of fly ash as a filler can have a favorable effect on the hot asphalt mixture.