Design of high modulus asphalt overlay for concrete pavements

Lister, James (2016) Design of high modulus asphalt overlay for concrete pavements. [USQ Project]

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Abstract

The majority of the main road networks in Australia where completed some time ago, and with over two-thirds of our goods transported by road freight, it is putting increasing pressure on the road system (Sharp and Johnson-Clarke, 1997). A cost-effective alternative to increasing the longevity of the roads is needed. Asphalt overlay is the most common type of pavement restoration; and the two widely used methods are a thin asphalt concrete mix or just thin asphalt (Cülfik, 2014).

This project focuses on the single layer of asphalt only, with an elevated modulus applied on top of a previously cracked rigid pavement. The standard for road design in Australia is predominantly guided by Austroads and although there are specifications in regards to asphalt, a method is yet to be adapted for high modulus overlay on top of cracked concrete pavement. The finite element program EverFE was used to model the pavement designs using different configurations and material properties gathered from Australian pavement literature, including subgrade strength, joint condition, the size of cracked concrete base and modulus of all layers. EverFE although user friendly it is only designed to model multiple slabs on the top layer, therefore multiple designs were modeled using two different types of slab configurations.

The tensile stress in the concrete slab is significantly reduced when an asphalt overlay is applied, on average a 58% reduction amongst all the pavements modeled. The results from the project indicate that a 50mm asphalt layer does not act as a structural layer for the pavement and a large percentage of the stress is directly transferred to the lower layers beneath the asphalt. Further to this, the results highlight that for all the simulations conducted an overlay of 70mm would be suitable.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) Major Civil Engineering project
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Nataatmadja, Andreas
Date Deposited: 20 Jul 2017 23:02
Last Modified: 20 Jul 2017 23:02
Uncontrolled Keywords: modulus asphalt overlay; concrete pavements; road networks
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
URI: http://eprints.usq.edu.au/id/eprint/31433

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