Evaluation of thin-lift overlay pavement preservation practice: Mixture testing, pavement performance, and lifecycle cost analysis

Soohyok Im, Taesun You, Yong Rak Kim, Gabriel Nsengiyumva, Robert Rea, Hamzeh Haghshenas

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

This study examines the practice of using thin-lift overlays (25-mm-thick asphalt) that was implemented recently for Nebraska's highways by comparing it with the state's traditional 50-mm-thick rehabilitation practice. The two overlay mixtures were acquired from actual paving projects on I-80 to conduct various laboratory tests, including the dynamic modulus test, dynamic creep test, semicircular bending fracture test, and Hamburg wheel tracking test. Based on the material's characteristics obtained from the laboratory tests, structural performance analysis is conducted to compare the pavement performance with the two different overlay mixtures. In addition, a lifecycle cost analysis (LCCA) is performed to compare the economic benefits associated with the thin-lift overlay with those of the conventional overlay practice. Laboratory results show that the fine-graded thin-lift overlay mixture behaves similarly to the coarser-graded conventional overlay mixture in terms of mixture stiffness, rutting potential, and cracking resistance. The one exception is its resistance to damage caused by moisture. The simulation predicts that both pavements will perform satisfactorily during their expected design life, but the LCCA indicates that the practice of using the thin-layer preservation technique can reduce both the agency's and users' costs compared with the conventional 50-mm-thick rehabilitation practice. Good field performance from both overlay pavements is observed after 15 and 27 months open to traffic.

Original languageEnglish (US)
Article number04018037
JournalJournal of Transportation Engineering Part B: Pavements
Volume144
Issue number3
DOIs
StatePublished - Sep 1 2018

Keywords

  • Field performance
  • Laboratory tests
  • Lifecycle cost analysis (LCCA)
  • Mechanistic-Empirical Pavement Design Guide (MEPDG)
  • Pavement preservation
  • Thin asphalt overlay

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Transportation

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