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Impact of temperature and moisture on the tensile strain of asphalt concrete layers

Sulejmani, Pajtim LU ; Said, Safwat ; Agardh, Sven LU and Ahmed, Abubeker (2021) In International Journal of Pavement Engineering 22(13). p.1711-1719
Abstract

Moisture in unbound layers and temperature in asphalt layers affect the structural response of pavements, such as the tensile strain at the bottom of asphalt concrete layers. Previous studies have proposed relationships for estimating tensile strain at the bottom of an asphalt layer from Falling Weight Deflectometer (FWD) surface deflection measurements. These relationships have been developed based on theoretical calculations of strains and surface deflections. The main objective of this study was to evaluate these relationships using measured FWD deflections and tensile strains at the bottom of asphalt concrete layers. Three instrumented test structures were considered in the study. FWD and strain measurements were conducted at... (More)

Moisture in unbound layers and temperature in asphalt layers affect the structural response of pavements, such as the tensile strain at the bottom of asphalt concrete layers. Previous studies have proposed relationships for estimating tensile strain at the bottom of an asphalt layer from Falling Weight Deflectometer (FWD) surface deflection measurements. These relationships have been developed based on theoretical calculations of strains and surface deflections. The main objective of this study was to evaluate these relationships using measured FWD deflections and tensile strains at the bottom of asphalt concrete layers. Three instrumented test structures were considered in the study. FWD and strain measurements were conducted at varying groundwater levels in the subgrade and temperatures in the asphalt concrete layers. The results revealed that the relationships have poor agreement with measured strains. A new relationship is proposed that incorporates the volumetric water content in the subgrade and the temperature in the asphalt layers in addition to the surface FWD deflections.

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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Asphalt concrete, Falling Weight Deflectometer (FWD), moisture, temperature, tensile strain
in
International Journal of Pavement Engineering
volume
22
issue
13
pages
1711 - 1719
publisher
Taylor & Francis
external identifiers
  • scopus:85078495937
ISSN
1029-8436
DOI
10.1080/10298436.2020.1715404
language
English
LU publication?
yes
id
6d654eeb-96a9-4aeb-bd9b-c592b30f5126
date added to LUP
2020-02-10 13:03:11
date last changed
2022-04-18 20:26:18
@article{6d654eeb-96a9-4aeb-bd9b-c592b30f5126,
  abstract     = {{<p>Moisture in unbound layers and temperature in asphalt layers affect the structural response of pavements, such as the tensile strain at the bottom of asphalt concrete layers. Previous studies have proposed relationships for estimating tensile strain at the bottom of an asphalt layer from Falling Weight Deflectometer (FWD) surface deflection measurements. These relationships have been developed based on theoretical calculations of strains and surface deflections. The main objective of this study was to evaluate these relationships using measured FWD deflections and tensile strains at the bottom of asphalt concrete layers. Three instrumented test structures were considered in the study. FWD and strain measurements were conducted at varying groundwater levels in the subgrade and temperatures in the asphalt concrete layers. The results revealed that the relationships have poor agreement with measured strains. A new relationship is proposed that incorporates the volumetric water content in the subgrade and the temperature in the asphalt layers in addition to the surface FWD deflections.</p>}},
  author       = {{Sulejmani, Pajtim and Said, Safwat and Agardh, Sven and Ahmed, Abubeker}},
  issn         = {{1029-8436}},
  keywords     = {{Asphalt concrete; Falling Weight Deflectometer (FWD); moisture; temperature; tensile strain}},
  language     = {{eng}},
  number       = {{13}},
  pages        = {{1711--1719}},
  publisher    = {{Taylor & Francis}},
  series       = {{International Journal of Pavement Engineering}},
  title        = {{Impact of temperature and moisture on the tensile strain of asphalt concrete layers}},
  url          = {{http://dx.doi.org/10.1080/10298436.2020.1715404}},
  doi          = {{10.1080/10298436.2020.1715404}},
  volume       = {{22}},
  year         = {{2021}},
}