Long-Life Flexible Pavement: Myth, Reality, and the Way Forward

Yuhong Wang, Dan Chong

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

1 Citation (Scopus)

Abstract

Long-life flexible pavements with more than 40 years of life expectancy are often found to be the most economical solution for heavily trafficked roads. Based on long-life flexible pavement design, construction, and maintenance practices in Hong Kong, this paper discusses four issues related to long-life flexible pavements: the cost and benefit, distresses, binder aging, and maintenance strategies. The studies found that long-life pavements are the most economical and environmentally friendly option for moderately and heavily trafficked roads. Long-life pavement cannot be realized by simply increasing asphalt concrete thickness; instead, attentions also need to be paid to construction details. A major distress mode is interfacial deterioration caused by inadequate bonding and high air voids content at the interface. In contrary to long-held belief that asphalt binder in deep pavement layer does not age, recent studies found binder throughout the long-life pavement structure is severely aged after long-time field service. Current practices and field experiments indicate that certain maintenance measures such as crack sealing are not necessary for long-life pavements in certain climate regions. Therefore, long-life pavement demands less maintenance treatments. The findings are expected to contribute to better practices in long-life flexible pavement design, construction, and maintenance.
Original languageEnglish
Title of host publicationNew Frontiers in Road and Airport Engineering - Selected Papers from the 2015 International Symposium on Frontiers of Road and Airport Engineering, IFRAE 2015
PublisherAmerican Society of Civil Engineers (ASCE)
Pages268-283
Number of pages16
ISBN (Electronic)9780784414255
Publication statusPublished - 1 Jan 2015
Event2015 International Symposium on Frontiers of Road and Airport Engineering, IFRAE 2015 - Tongji University, Shanghai, China
Duration: 26 Oct 201528 Oct 2015

Conference

Conference2015 International Symposium on Frontiers of Road and Airport Engineering, IFRAE 2015
CountryChina
CityShanghai
Period26/10/1528/10/15

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Transportation

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