UC Pavement Research Center
Available online at: https://trid.trb.org/view/1572858
Zhang, Hengji, Hui Li, Ahmed Abdelhady, John T. Harvey (2019) Effects of Fine Solid Waste as Alternative Filler on Asphalt Mortar Effects of Fine Solid Waste as Alternative Filler on Asphalt Mortar. Transportation Research Board 98th Annual Meeting
Asphalt and filler interaction plays a key role in the performances of asphalt mastics and mixtures, while the interaction ability of asphalt and filler is in turn affected by the material characteristics. Nowadays, plenty of fine solid waste with extremely different physical and chemical properties have been used as alternative filler to limestone powder. This study analyzed the effects of filler characteristics on asphalt mortar and the feasibility of re-use of the fine solid waste. Firstly, four types of filler (limestone, fly ash, diatomite and red mud) were used to prepare twenty types of asphalt mortar with different fillers to bitumen ratio by volume (0.11, 0.22, 0.33, 0.44, and 0.55). Secondly, the rheological properties of asphalt mortar were examined through Brookfield Viscosity, Superpave high-temperature binder criteria G*/sin δ, and Multiple Stress Creep Recovery. Thirdly, this study investigated the effect of filler type and filler-bitumen ratio (FBv) by volume method to adhesion performance in water and dry condition. Finally, a critical of FBv range was recommended in view of the overall performance. The results indicated that the performance of asphalt mortar with red mud and diatomite exhibited improvement in the high-temperature performance and adhesion ability in case of dry and water conditions. Hence, red mud and diatomite can be used as alternative filler to limestone powder.
Key words: Asphalt mixtures, fillers (materials), fly ash, limestone, mastic asphalt, rheological properties