Soil stabilisation in road pavements

Kohler, Jarred (2016) Soil stabilisation in road pavements. [USQ Project]

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Roads and Maritime Services (RMS) manages approximately 18,000 km’s worth of state controlled roads which comprise of both flexible and rigid pavements. RMS Maintenance business units across New South Wales strive to achieve sustainable pavements which meet the needs of their customers. For flexible pavements this is commonly achieved through lime stabilisation. Mixing lime with existing road pavements is a stabilisation technique which has been used to improve the design life of pavements whilst reducing the maintenance frequency and associated costs with maintaining a deteriorating asset.

Lime stabilisation is used as part of Regional Maintenance Delivery (RMD) Mid North Coast’s (MNC) heavy patching program which is aimed at modifying the existing base layer pavements by incorporating new materials into the road pavements whilst still utilising the existing road formation. This leads to improved plasticity, drying the material and achieving stronger pavements in terms of compressive strengths, hence reducing maintenance associated costs.

The main issue the MNC district has with lime stabilisation is the varying material properties that are gained from construction from significantly different pavement designs. Due to this, the research will investigate the ways in which lime reacts with locally sourced gravel at different percentages of lime.

Unconfined compressive strengths (UCS’s) are the most common method for determining the strength of a cementitious bound material and for this reason UCS’s have been used to compare strengths throughout this investigation. The research has confirmed that compressive strengths increase with the addition of lime to locally sourced gravel.Strengths of up to 6.35 MPa have been recorded when 9% lime has been added, however these high percentages potentially introduce other unwanted factors such as cracking and lime leaching. Optimum lime contents between 3-5% have been found to be the most successful which decrease the chances of introducing unwanted side effects whilst still achieving UCS’s of 3.9 to 5.5 MPa.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) Major Civil Engineering project
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Nataamadja, Andreas
Date Deposited: 20 Jul 2017 22:40
Last Modified: 20 Jul 2017 22:40
Uncontrolled Keywords: soil stabilisation; road pavements; unconfined compressive strengths
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials

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