Performance of unbound pavement materials in changing moisture conditions

Marit Fladvad*, Sigurdur Erlingsson

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Expected climate changes will in many areas represent a shift towards increased precipitation and more intense rainfall events. This may lead to increased moisture within road structures and possible overloading of road drainage systems. Pavement design methods must therefore be able to predict the behaviour of pavement materials at increased moisture levels. An instrumented accelerated pavement test (APT) has been conducted on two thin flexible pavement structures with coarse-grained unbound base course and subbase materials using a heavy vehicle simulator (HVS). The two pavement structures were identical except for the grain size distribution of the subbase material, where one had a dense 0/90 mm curve with a controlled fines content, and the other had an open-graded 22/90 mm curve. The APT was conducted using constant dual wheel loading, and three different groundwater levels were induced in order to change the moisture content in the structures. The HVS was stopped regularly for carrying out response measurements from the instrumentation. The analysis is focussed on the response and the performance of the unbound aggregate layers to varying moisture levels in the pavement structure.

Original languageEnglish
Title of host publicationAccelerated Pavement Testing to Transport Infrastructure Innovation - Proceedings of 6th APT Conference
EditorsArmelle Chabot, Pierre Hornych, John Harvey, Luis Guillermo Loria-Salazar
Number of pages10
ISBN (Print)9783030552350
Publication statusPublished - 2020
Event6th International Conference on Accelerated Pavement Testing, APT 2021 - Nantes, France
Duration: 27 Sept 202129 Sept 2021

Publication series

NameLecture Notes in Civil Engineering
Volume96 LNCE
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565


Conference6th International Conference on Accelerated Pavement Testing, APT 2021

Bibliographical note

Publisher Copyright:
© Springer Nature Switzerland AG 2020.

Other keywords

  • Accelerated pavement test
  • Groundwater table
  • Heavy vehicle simulator
  • Moisture content


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