Effectiveness of geotextiles in unsurfaced pavements over weak subgrade evaluated from accelerated field testing

Debakanta Mishra, Erol Tutumluer

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Unsurfaced pavement sections are often constructed over weak subgrades and placement of geotextiles at the aggregate-subgrade interface has been shown to provide layer separation and pavement reinforcement benefits. As part of a recent full-scale pavement testing research effort at the University of Illinois, open-graded aggregate materials with large top-size particles were used to provide a "platform" for placement and compaction of dense-graded surface layers. Geotextile separation and reinforcement of the aggregate-subgrade interface was considered in the experimental design to improve load distribution within the aggregate layer and prevent material migration across the layer interface. A 305-mm thick foundation layer was first constructed over the subgrade, and was subsequently "capped" with a 152-mm thick surface layer comprising a dense-graded crushed limestone material. The test sections were loaded to failure under geotextile-reinforced and unreinforced conditions along two wheel paths separated by a distance of 2.4 m. The geotextile-reinforced sections performed significantly better and showed lower rate of rut accumulation compared to the unreinforced sections that underwent shear failure after a few load applications. The reinforced sections also sustained significantly higher number of load applications (up to 200% higher) before accumulating the same amount of rutting as the unreinforced sections. Excavation of transverse trench sections after testing showed significantly reduced interlayer material migration due to geotextile use.

Original languageEnglish (US)
Title of host publicationAdvances in Transportation Geotechnics II - Proceedings of the 2nd International Conference on Transportation Geotechnics, ICTG 2012
Pages492-497
Number of pages6
StatePublished - Oct 19 2012
Event2nd International Conference on Transportation Geotechnics, ICTG 2012 - Hokkaido, Japan
Duration: Sep 10 2012Sep 12 2012

Publication series

NameAdvances in Transportation Geotechnics II - Proceedings of the 2nd International Conference on Transportation Geotechnics, ICTG 2012

Other

Other2nd International Conference on Transportation Geotechnics, ICTG 2012
CountryJapan
CityHokkaido
Period9/10/129/12/12

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Transportation

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