Foam bitumen stabilisation in north west NSW

Wilton, Joshua (2014) Foam bitumen stabilisation in north west NSW. [USQ Project]

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Abstract

Foam bitumen stabilisation (FBS) is a pavement rehabilitation technique that binds the granular material together with bitumen. Foamed bitumen is being applied to the existing road pavement in North West NSW between Narrabri and Moree on the Newell Highway. This section of the Highway is prone to pavement failures due to the expansive black clays in the area. Foamed bitumen is now being trialled to see if an increase in flexibility can help increase the pavements life span. The report focuses on monitoring Tycannah foam bitumen stabilised project and the Bellata foam bitumen stabilised project between Narrabri and Moree on the Newell Highway. The success of the foam bitumen is important for this remote area due to the costly exercise of carting road-base. Therefore in order to determine whether it will be successful, monitoring the recent projects is vital. An extensive amount of research into the foam bitumen process was undertaken with this study as to achieve an understanding on how the process works. Once an understanding was achieved, the field data on each of the projects was collected and analysed to help determine if the construction methods or materials used are the cause of any pavement failures. This in turn assisted with monitoring of the project sites after construction. Through monitoring the project sites it was found that longitudinal cracking was occurring at the different foamed bitumen projects. Due to the cracking core samples from the Tycannah FBS project were taken to investigate the resilient modulus (stiffness) of the pavement. The results of the cores showed high resilient modulus which is due to the addition of too much lime, although the main reason of the cracking can be put down to the expansive sub-grade soils. Therefore further monitoring and tests on the foam bitumen projects will be needed to achieve a better understanding of how to achieve the optimum foamed bitumen mix design over the expansive clay between Narrabri and Moree. Therefore foam bitumen stabilisation between Narrabri and Moree on the Newell Highway needs further research in order to determine whether different mix designs will be successful. In order to achieve this more FBS projects will need to be undertaken with different mix designs.


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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: Drysdale, Trevor
Date Deposited: 09 Sep 2015 05:18
Last Modified: 09 Mar 2016 05:36
Uncontrolled Keywords: bitumen; foamed bitumen; Narrabri; Moree; Newell Highway; New South Wales; road rehabilitation
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090507 Transport Engineering
URI: http://eprints.usq.edu.au/id/eprint/27312

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