Evaluation of Pavement Support for Pavement Design
Publication: Journal of Transportation Engineering
Volume 141, Issue 9
Abstract
It is well-known that the performance of Portland cement concrete (PCC) pavement depends, to a great extent, on the support condition under the slab. The Texas Department of Transportation (TXDOT) recognized the importance of the support condition and requires the use of a stabilized base, either a 10.16-cm hot mix asphalt layer or a minimum 2.54-cm asphalt concrete over a 15.24-cm cement-stabilized layer. For pavement design purposes, has been used as the default value for the modulus of the subgrade reaction ( value) for the support provided by these bases. The use of a single value of for the value in rigid pavement design was partly because of the insensitivity of the required slab thickness to the modulus of the subgrade reaction in the current TXDOT rigid pavement design procedure. To improve rigid pavement design, TXDOT developed a new design procedure for continuously reinforced concrete pavement (CRCP) on the basis of mechanistic-empirical principles and plans to implement the procedure. In this design procedure, the slab support has rather more substantial effects on the required slab thickness than the current TXDOT design procedure. To increase the reliability of the new pavement design procedure, accurate evaluations of the value are important. A test section was constructed in which various base types were used, and a number of field tests were conducted to estimate the range of values for the support systems that are currently used or expected to be utilized, including the placement of nonwoven geotextile in lieu of the asphalt layer. The current practice of using one default value of needs to be revised, and the use of nonwoven geotextile is not recommended until further evaluations prove its viability.
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Acknowledgments
This research study was sponsored by the Texas Department of Transportation in cooperation with the Federal Highway Administration. The authors acknowledge the support provided by the contractors and TXDOT personnel during field testing. This study was also conducted under a research project (Development of Eco-Friendly Pavements to Minimize Greenhouse Gas Emissions) funded by the Ministry of Land, Infrastructure, and Transport (MOLIT) and the Korea Agency for Infrastructure Technology Advancement (KAIA). The authors would like to thank the members of the research team, MOLIT, and KAIA for their guidance and support throughout the project.
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© 2015 American Society of Civil Engineers.
History
Received: Feb 21, 2014
Accepted: Mar 16, 2015
Published online: May 20, 2015
Published in print: Sep 1, 2015
Discussion open until: Oct 20, 2015
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