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Show simple item record Komba, Julius J O'Connell, Johannes S Paige-Green, P 2014-08-27T05:52:36Z 2014-08-27T05:52:36Z 2014-07
dc.identifier.citation Komba, J.J, O’Connell, J and Paige-Green, P. 2014. Evaluation of the performance of aggregate in hot-mix asphalt. In: 33rd Annual Southern Africa Transportation Conference, Pretoria, South Africa, 7-10 July 2014 en_US
dc.identifier.isbn 978-1-920017-61-3
dc.description 33rd Annual Southern Africa Transportation Conference, Pretoria, South Africa, 7-10 July 2014 en_US
dc.description.abstract The overall performance of an asphalt mix is dependent on, amongst others, the properties of the constituent materials, which include aggregate, binder and filler. The aggregate for production of asphalt mixes is usually sourced from a quarry, which is established through a long and expensive process. A quick evaluation of a new aggregate source will give some indication of its future performance as well as facilitate its introduction into the market place. This paper presents a study of the comparative performance of two aggregates; a granite aggregate of known good performance and a relatively unknown quartzite aggregate containing up to 30% shale. The basic properties of the quartzite aggregate were assessed; following which, the performance of the aggregate in an asphalt mix was evaluated. The design grading of the asphalt mixes was similar; the only difference being that the coarse granite fractions (6.7 and 9.5 mm) of the asphalt mix of known good field performance were replaced by coarse quartzite fractions. The same binder type and crusher sand was used in both asphalt mixes, allowing for a comparative evaluation of the mixes in the laboratory. The asphalt performance-related tests conducted on the mixes included Repeated Simple Shear Test at Constant Height (rutting indicator), beam fatigue test (cracking indicator), dynamic modulus (stiffness indicator) and modified Lottman test (durability indicator). The test results were analysed statistically, to establish whether the performance of the asphalt mixes differed. en_US
dc.language.iso en en_US
dc.relation.ispartofseries Workflow;13342
dc.subject Hot-Mix Asphalt en_US
dc.subject HMA en_US
dc.subject Aggregates en_US
dc.subject Granite aggregate en_US
dc.subject Quartzite aggregate en_US
dc.title Evaluation of the performance of aggregate in hot-mix asphalt en_US
dc.type Presentation en_US

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