期刊
APPLIED SCIENCES-BASEL
卷 9, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/app9040628
关键词
aggregate gradation; fine aggregates; maximum aggregate size; cracking; Fenix test
类别
资金
- Spanish Ministry of Economy and Competitiveness, through the call RETOS-COLABORACION 2015 of the National Programme of Research, Development and Innovation to face the challenges of Society, within the National Scientific and Technical Research and Innovat [RTC-2015-4025-4]
- European Union, through FEDER funds
- Agency for Management of University and Research Grants of the Catalonia Government through the Industrial Doctorates Plan
Thin asphalt concrete overlays are a maintenance technique that mainly restore the functional properties of pavements. One of the main issues in thin overlays is reflective cracking that can cause early deterioration and reduce their service life. For this reason, the purpose of this investigation is to evaluate the effect of material selection on cracking performance of asphalt concrete mixtures for thin overlays. In particular, this paper evaluates the role of aggregate skeleton gradation. The study of the effect of aggregate gradation was divided into two stages: (1) fine fraction content and (2) maximum nominal aggregate size. Based on this, up to seven asphalt mixture gradations were designed and evaluated through the Fenix test at different test temperatures. The results showed a significant correlation between the fine fraction content, and maximum nominal aggregate size, and the cracking performance of the asphalt concrete mixtures. Mixtures manufactured with a low content of fine aggregates, as well as small nominal maximum size, experienced a further improvement of their toughness. These results reflected the importance of considering not only the effect of asphalt binder and environmental conditions but also aggregate gradation in the design of asphalt concrete mixtures in order to achieve a desirable cracking performance.
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