Cost effective pavement reconstruction or rehabilitation profile(s) in Townsville

Single, John H. (2014) Cost effective pavement reconstruction or rehabilitation profile(s) in Townsville. [USQ Project]

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Abstract

Councils all over Australia face the same issue; cost effectively reconstructing or rehabilitating trunk roads under traffic. In recent years, the Townsville City Council has undertaken numerous pavement reconstruction or rehabilitation projects of varying profiles. The identification of a cost effective and successful reconstruction or rehabilitation profile would, from a planning perspective, assist a Council in preparing their works programs and securing the appropriate funding required. This project has sought to determine the most cost effective and successful reconstruction or rehabilitation of four (4) varying profiles constructed within Townsville.

A cost-benefit analysis has considered the following criteria;
 pavement design and expected design life;
 in-service performance;
 costs associated with the project.

The pavement profiles analysed consisted of cement treated subbase (CTSB), cement modified base (CMB) and asphalt surfacing along with in-situ stabilisation works utilising cement and foam bitumen.

Whilst the concept of being able to accurately determine a cost effective profile that could be blindly adopted within the local region appears to be useful, the complexities behind pavement design, evaluation, construction and general overall variability of materials result in an extremely complicated procedure.

Via simplification of the original intended analysis, it was observed that there were significant cost savings when in-situ stabilisation can be undertaken, however the ability to construct a consistent CMB modulus within the design envelope appears to be significantly difficult. This is supported by the mean back-analysed base layer modulus being well above 2500 MPa, suggesting its performing more like a cement treated base (CTB) layer as opposed to the design intent of a CMB.


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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Civil) project.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Supervisors: Ayers, Ron
Date Deposited: 09 Sep 2015 05:14
Last Modified: 08 Mar 2016 02:05
Uncontrolled Keywords: cost-benefit, reconstruction, pavement
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090507 Transport Engineering
URI: http://eprints.usq.edu.au/id/eprint/27239

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