Traffic induced moisture entry into road pavements

Langdon, Aaron G. (2009) Traffic induced moisture entry into road pavements. [USQ Project] (Unpublished)

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Abstract

Most Australian roads have experienced potholes and other types of pavement failures. An excessive amount of moisture in road pavements is often a major contributing factor to these pavement failures. Queensland has a very large road network connecting rural with urban and dense populations with sparse populations. This project seeks to investigate the penetration of water into road pavements due to the compounding nature of traffic. This project will determine if moisture enters the pavement through the compounding nature of traffic and quantify the extent of the problem. In Australia sprayed seal surfacing are used on most rural, arterial and rural local roads. Tyre pressures, traffic volumes, speed, loads and the amount of heavy vehicles have increased dramatically over time. This has led to an increase in pavement failures particularly in the wheel paths. An obvious cause of these failures is excessive amounts of moisture in these failure zones. Data provided by Queensland Department of Transport and Main Roads – Toowoomba and samples that were collected were analysed. As a result of this analysis it was found that there was more moisture in the wheel paths compared to between the wheel paths. Although the majority of locations had higher moisture content in the outer wheel path than the inner wheel path, infiltration through the shoulder was an unlikely cause due to the moisture content in the inner wheel path shoulder being less than that of the outer wheel path in some cases. It is also evident that the more re-seals there were, the less moisture content there was within the pavement. The results of the permeameter tests revealed that spray seals are classed as ‘permeable’ under atmospheric pressure. Under pressure at the same locations the classification increases to ‘moderately free draining’. This indicates that under more realistic traffic conditions, moisture does penetrate spray seals. The results of this study show that moisture does penetrate the pavement due to the compounding nature of traffic


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Item Type: USQ Project
Refereed: No
Item Status: Live Archive
Depositing User: epEditor USQ
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 16 Jul 2010 00:53
Last Modified: 16 Jul 2010 02:45
Uncontrolled Keywords: road pavements; moisture entry; vehicular impact
Fields of Research (FOR2008): 09 Engineering > 0905 Civil Engineering > 090507 Transport Engineering
URI: http://eprints.usq.edu.au/id/eprint/8395

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