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

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

Evaluation methods for porous asphalt pavement in service for fourteen years

“…The similar test was performed for Type E using wheel tracking test of Hokkaido University Type and we found maximum tensile strain at 45 C for one hour reached to 3.69 % using ARAMIS system and this value corresponds to the width of crack of 0.555 mm using ARAMIS system and micro focus CT scanner [16]. The crack may be occurred at smaller tensile strain, because the minimum width of crack in Type E was 0.185 mm using micro focus CT scanner.…”

Performance evaluation of high-elastic asphalt mixture containing deicing agent Mafilon

“…The wheel tracking test has been employed by many researchers to evaluate the rutting resistance of asphalt mixtures [20][21][22]. The test specimen is a slab prepared by a roller compactor with a length and width of 300 mm and a thickness of 50 mm.…”

Experimental Study on the High‐Temperature Shear Performance of Asphalt Mixtures

“…Jiang et al [4] examined the permanent deformation characteristics of asphalt mixtures under multiple repeated loads. Moriyoshi et al [5] investigated the strain distribution law inside asphalt mixtures at high temperatures through rutting tests. Karami et al [6] analyzed the permanent deformation of asphalt pavement mixtures through dynamic creep tests.…”