Comparative evaluation of designing asphalt treated base mixture with composite aggregate types. (15th December 2017)

• Record Type: Journal Article
• Authors: Kong, Dezhi; Xiao, Yue; Wu, Shaopeng; Tang, Ning; Ling, Juntao; Wang, Fusong
• Is Part Of: Construction & building materials. Volume 156(2017)
• Page Start: 819
• Page End: 827
• Publication Date: 2017-12-15
• Subjects: Composite aggregate -- Asphalt treated base -- Effective density -- Road performance -- Asphalt mixture; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.09.020
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Composite aggregates is effective way to solve aggregate shortage in mixture design. Effective density should be used in the mixture design with composite aggregates. Composite aggregate changes volumetric properties of composite asphalt mixtures. Alkaline coarse aggregates improve mechanical properties of asphalt treated base. Mixture with composite of basalt and limestone has better moisture resistance. Abstract: This study aims at investigating the possibility of using basalt, limestone and andesite aggregates combinations in asphalt treated base mixture. Rapid developing of asphalt pavement construction results in the lack of high quality aggregates and environmental damage. Using the composite aggregates in asphalt mixtures is an effective way to solve problems of aggregate shortage and minimize the environmental depredation. Two types of composition methods, Coarse-Fine (C-F) composition method and Coarse-Coarse (C-C) composition method, were proposed and studied. Effective density was used in the mixture design to improve the accuracy on using composite aggregate. Research results illustrate that composite aggregate will change the volumetric properties of composite asphalt mixtures. The incorporation of alkaline coarse aggregates or surface roughness coarse aggregates on the aggregate can improve the mechanical properties of asphalt treated base. Asphalt mixture with composite of basalt and limestone aggregates can significantly enhance the moisture resistance property. Changing the types of coarse aggregates will result in more variables than changing the fine aggregates types.