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Strain distribution in asphalt mixtures during the wheel tracking test at high temperatures

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Title: Strain distribution in asphalt mixtures during the wheel tracking test at high temperatures
Authors: Moriyoshi, Akihiro Browse this author →KAKEN DB
Takahashi, Naoyuki Browse this author
Ikeda, Osamu Browse this author
Kawashima, Masato Browse this author
Akabane, Takahiko Browse this author
Keywords: Asphalt mixture
Wheel tracking test
High temperature
Tensile strain
Shear stain
Micro-focus computerized tomography (CT) scanner
ARAMIS system
Issue Date: Mar-2013
Publisher: Elsevier
Journal Title: Construction and Building Materials
Volume: 40
Start Page: 1128
End Page: 1135
Publisher DOI: 10.1016/j.conbuildmat.2012.11.040
Abstract: In general rutting in asphalt pavements occurs at high temperatures and cracks occur at cold temperatures. It has been believed that longitudinal cracks mainly arise due to the shear of moving wheels at high temperatures. This research performed wheel tracking tests at 45 C on asphalt samples in holders which at one end consists of transparent glass. The distribution of the tensile and shear strains using the ARAMIS System for gathering data of the exposed end (30 5 cm) of the specimens visible through the transparent glass was measured. Thereafter, specimens (5 8 2.5 cm) cut from large specimen (5 30 30 cm) for CT scanner. The width of crack was also analyzed by CT scanner in three dimensional. It was found that the rutting depth in all specimens after 1 h (2400 wheel passes) at 45 C was smaller than 1 mm, but that the tensile strains in all specimens at 1 hour were 25,000 10 6 (2.5%) or larger and a strain of 3.69% which corresponds to a longitudinal crack width of 0.555 mm by CT analysis and ARAMIS system. It was also found that the cracks at the high temperature under the moving wheels were mainly caused by the tensile strain rather than shear strain and the load spreadability in mixtures depends upon the type of mixture and properties of asphalt. It is concluded that both methods are useful to evaluate the damage of mixture.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 森吉 昭博

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