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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/1018

Title: Aggregate packing characteristics of good and poor performing asphalt mixes
Authors: Denneman, E
Verhaeghe, BMJA
Sadzik, ES
Keywords: Hot mix asphalt
Continuously graded asphalt
Dominant aggregate size range
Southern African Transport Conference
Issue Date: Jul-2007
Publisher: Proceedings of the 26th Southern African Transport Conference 2007
Citation: Denneman, E, Verhaeghe, BMJA and Sadzik, ES.2007. Aggregate packing characteristics of good and poor performing asphalt mixes. The Challenges of implementing policy. 26th Annual Southern African Transport Conference and Exhibition, Pretoria, South Africa, 9 - 12 July 2007, pp 213-224
Abstract: The aggregate structure of the compacted mix is a determining factor for the performance of Hot-Mix Asphalt (HMA). In this paper, the grading characteristics of good and poor performing HMA mixes are explored using the concepts of the Bailey method and related techniques for determining the porosity of the Dominant Aggregate Size Range (DASR) and the permeability characteristics of the mix. The aim is to assess the potential benefits of these new gradation analysis techniques for HMA performance in South Africa. The aggregate gradation of past mix designs, for which the field performance is known, are analysed and discussed in the paper. Typical properties of the aggregate structures of good and poor performing medium continuously graded asphalt (ACM) mixes are identified. The primary differences between the grading of the studied good and poor performing mixes lie in the grading of the coarser aggregate. While the poor performing mixes are coarser according to the classical definition, the good performers have a more voluminous DASR. The paper concludes that the grading analysis concepts allow the design engineer new insights into the structure of aggregates. The principles can be used to develop more specific guidelines for aggregate structure selection.
URI: http://hdl.handle.net/10204/1018
Appears in Collections:Infrastructure engineering
General science, engineering & technology

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