Abstract
Rutting is a major distress occurring in the service life of the asphalt pavement, especially in hot weather areas. A laboratory-produced specimen is widely used for rutting performance evaluation which may not be completely represented by the field situation. The objective of this study is to evaluate the rutting performance of field specimens from the Chongqing highway by utilizing the Hamburg wheel-tracking test (HWTT) and dynamic modulus test. Different test conditions were conducted on the HWTT by investigation of the actual local weather condition. The results showed that rutting depth was different under different test conditions, and 10000 loading cycles were recommended as the maximum loading cycles. Particularly, several factors that influence the rutting depth were investigated, and the specimen height of 6 cm is more appropriate for the HWTT. Additionally, different test conditions were proposed as the HWTT test condition for different asphalt concrete (AC) layers in the Chongqing area. Rutting contribution of each AC layer to the pavement structure was analyzed. Moreover, the dynamic modulus at 54.4°C, 5 Hz and 54.4°C, 1 Hz could effectively represent the rutting performance of the asphalt mixture, and the dynamic modulus test is recommended for the rutting performance evaluation of the full-thickness AC layer.
Highlights
Due to the increasing traffic volume and extreme weather condition, rutting is one of the most common distress types in the asphalt pavement, which decreases the driving comfort and the pavement service life
Based on the aforementioned studies, field specimens with various thicknesses and different test conditions are considered and the Hamburg wheel-tracking test (HWTT) and dynamic modulus test are utilized as the test methods. e primary objective of this study is to evaluate the rutting performance of different asphalt concrete (AC) layers through the HWTT and dynamic modulus test by utilizing in-service field specimens from Chongqing. e reasonable test condition of the HWTT to evaluate the rutting performance is recommended for the Chongqing area. us, the influence of the compaction degree, AC layer thickness, mixture type, and test condition on the rutting performance is investigated, and the rutting depth contribution of each layer is calculated under 65°C in the dry condition
Specimen Information. e cores from the field were fabricated into different specimens, which were the top asphalt layer (T), middle asphalt layer (M), bottom asphalt layer (B), top and middle asphalt layers (TM), and middle and bottom asphalt layers (MB), respectively. e structure of the specimen is as illustrated in Figure 2. e information of specimens is shown in Table 2, where groups 1 to 9 are used for the HWTT and group 10 is used for the dynamic modulus test
Summary
Due to the increasing traffic volume and extreme weather condition, rutting is one of the most common distress types in the asphalt pavement, which decreases the driving comfort and the pavement service life. E wheel-tracking test is a very common method to evaluate the rutting performance of the asphalt mixture in China and abroad [6,7,8]. E Hamburg wheel-tracking test (HWTT) is utilized to assess the rutting performance of the asphalt mixture with different additives at various contents [13]. According to literature studies [18, 21], both the HWTT and dynamic modulus (E∗) tests are feasible tests for evaluating the rutting performance of the laboratory and field asphalt mixture specimens. E primary objective of this study is to evaluate the rutting performance of different AC layers through the HWTT and dynamic modulus test by utilizing in-service field specimens from Chongqing. By incorporating the test results with the HWTT, the dynamic modulus threshold value of a good rutting performance is proposed for the Chongqing area
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