Evaluation of the strength characteristics of recycled bituminous pavement materials

Neumann, Philip (2013) Evaluation of the strength characteristics of recycled bituminous pavement materials. [USQ Project]

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Abstract

The overall aim of this project is to evaluate the resilient modulus of asphalt mixes containing various proportions of recycled asphalt. The resilient modulus is an
important parameter used in the Austroads mechanistic design procedure and is an indicator of the potential fatigue life of a pavement. This study seeks to verify the
current guidelines for asphalt recycling in Australia and also previous experimental work. It will supplement existing data and may inspire further research.

The mix design tested was a dense grade 20 mm base course, in batches comprised of 0, 15, 30, 45 and 60% recycled material. For the 30, 45 and 60% mixes, the bitumen
binder was lowered by one grade to assess how effectively this compensates for the recycled binder ageing. The indirect tensile test method AS2891.13.1 was used to
determine the resilient modulus of the asphalt samples.

In general, it was found that increasing the proportion of recycled material increased the resilient modulus, which agreed with previous studies. However, it was found that there was a significant increase in the modulus of the 15% mix, despite claims that this should not significantly affect pavement performance. It was also found that lowering
the binder grade could potentially overcompensate for the hardened binder, producing softer pavements, which could be at increased risk of rutting. It was concluded that the
current Australian guidelines are not sufficient to make the most effective use of recycled asphalt and further studies are required.


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Item Type: USQ Project
Item Status: Live Archive
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Somasundaraswaran, Soma
Date Deposited: 13 May 2014 05:43
Last Modified: 13 May 2014 05:43
Uncontrolled Keywords: evaluation; strength characteristics, recycled bituminous pavement materials, asphalt
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
URI: http://eprints.usq.edu.au/id/eprint/24636

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