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Advances in Materials Science and Engineering
Volume 2015, Article ID 947834, 10 pages
http://dx.doi.org/10.1155/2015/947834
Research Article

Influence of Diatomite and Mineral Powder on Thermal Oxidative Ageing Properties of Asphalt

1College of Transportation, Jilin University, Changchun, Jilin 130025, China
2School of Civil Engineering, Hebei University of Engineering, Handan, Hebei 056038, China

Received 12 May 2015; Revised 25 July 2015; Accepted 29 July 2015

Academic Editor: Peter Majewski

Copyright © 2015 Yongchun Cheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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 (), 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.