Laboratory investigation of the effect of nano Caco3 on rutting and fatigue of stone mastic asphalt mixtures: Fid-Bau Portal

Laboratory investigation of the effect of nano Caco3 on rutting and fatigue of stone mastic asphalt mixtures

Yarahmadi, Amir Mohammad / Shafabakhsh, Gholamali / Asakereh, Adel

Highlights • The effect of Nano Caco3 on fatigue and rutting behavior of SMA mixture is studied. • Nano Caco3 increased the fatigue life and rutting resistance of the SMA mixture. • Moisture damage resistance of the SMA mixture was ameliorated by adding Nano Caco3. • Almost in all cases, 0.9% Nano Caco3-modified SMA mixture showed the best behavior.

Abstract In this research, the influence of Nano Caco3 as an additive on the mechanical characteristics of stone mastic asphalt (SMA) mixtures is investigated. For this purpose, asphalt binder 60–70 is modified with different ratios of Nano Caco3 to create the SMA samples. Indirect tensile fatigue, wheel track, and indirect tensile strength tests were conducted to evaluate fatigue, rutting, and moisture damage resistance of modified and control samples. The results revealed that by adding Nano Caco3 particles, the fatigue life of SMA mixtures is increased and their final strain is reduced. Nano Caco3 has a good potential to delay the formation and propagation of fatigue cracks in the SMA mixture. The results of the wheel track test demonstrated that Nano Caco3-modified SMA mixtures had lower rut depth than control mixtures. Also, the rutting performance of the SMA mixture was improved at high temperatures and stress levels. The results of the indirect tensile strength test showed that the addition of Nano Caco3 increased the moisture damage resistance of the SMA mixture and improved its performance when it was subjected to continuous exposure to water. It was observed that almost in all cases, modified SMA mixtures with a Nano ratio of 0.9%, exhibit the best behavior.