Comparative evaluation of designing asphalt treated base mixture with composite aggregate types

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.

Keywords: Composite aggregate, Asphalt treated base, Effective density, Road performance, Asphalt mixture

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D.Z. Kong, Y. Xiao* (Corresponding Author), S.P. Wu, N. Tang, J.T. Ling, F.S. Wang. Comparative evaluation of designing asphalt treated base mixture with composite aggregate types, Construction and Building Materials, Volume 156, 15 December, 2017, P: 819-827.

About Yue

An Associate Professor from State Key Lab of Silicate Materials for Architectures in Wuhan University of Technology, China since January 2014. Received PhD degree in Road and Railway Engineering in 2013 from Delft University of Technology in the Netherlands. His research interests are on asphalt pavement surfacing, road and pavement materials, asphalt pavement design.
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