Abstract
Ageing of asphalt affects the performances of asphalt pavement significantly. Therefore, effects of diatomite and mineral powder on ageing properties of asphalt were investigated systematically in order to improve the antiageing property of mixture. Thin film oven test (TFOT) was used to conduct the short term ageing in laboratory. Softening points, penetrations, force ductility, low temperature creep properties, and viscosities of asphalt mastics were tested before and after TFOT, respectively. Results indicated that percent retained penetration (PRP) increased with the increasing of fillers. Increment of softening point (ΔT), ductility retention rate (DRR), deformation energy ageing index (JAI), and viscosity ageing index (VAI) of asphalt mastics nonlinearly decreased with the increasing of fillers. Ageing of asphalt was reduced by diatomite and mineral powder. And the antiageing effect of diatomite was better than that of mineral powder as a result of its porous structure. It is suggested that the mineral powder could be reasonably replaced by diatomite in order to reduce thermal oxidative ageing of asphalt mixture. The optimal content of diatomite 12.8% is also suggested for engineering.
Highlights
Asphalt pavement has been developed rapidly for its good performance in the world [1]
The softening point of asphalt mastics linearly increases with the increasing of diatomite and mineral powder content before and after Thin film oven test (TFOT). It means that high temperature stability of asphalt is improved by diatomite and mineral powder
Diatomite asphalt mastics (DA) has better high temperature stability. This is mainly because that diatomite has a larger volume fraction for its lower density [9], which results in a higher softening point of DA
Summary
Asphalt pavement has been developed rapidly for its good performance in the world [1]. Asphalt ageing occurs during the constructing and service procedure of asphalt pavement. Viscosity of asphalt increases with the growing of ageing time. Asphalt turns into brittle material gradually [2]. Though ageing hardening of asphalt enhances the rutting resistance, low temperature property of asphalt pavement is reduced by hardening [1]. This will result in pavement cracks and reduced the comfortableness of driving [3]. The ageing hardening of asphalt has significant impact on pavement. It is necessary to find the solution which can improve the antiageing property of asphalt
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