Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature
The low-temperature crack of asphalt concrete is considered to be one of the main deteriorations in asphalt pavements. However, there have been few studies on the composite effects of the aggregate characteristics and fracturing modes on the low-temperature cracking of asphalt concrete. Hence, the e...
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| Format: | Article |
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MDPI AG
2019-08-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/12/17/2675 |
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| author | Yinshan Xu Yingjun Jiang Jinshun Xue Jiaolong Ren |
| author_facet | Yinshan Xu Yingjun Jiang Jinshun Xue Jiaolong Ren |
| author_sort | Yinshan Xu |
| collection | DOAJ |
| description | The low-temperature crack of asphalt concrete is considered to be one of the main deteriorations in asphalt pavements. However, there have been few studies on the composite effects of the aggregate characteristics and fracturing modes on the low-temperature cracking of asphalt concrete. Hence, the edge cracked semi-circular bend tests and the discrete element modeling approaches are combined to investigate the effect of the aggregate contents, aggregate morphological features and aggregate distributions on the fracture behavior of asphalt concrete in different fracturing modes at different temperatures. The results show that the fracture toughness and the crack extended time reduce with the increasing aggregate orientation and flatness and the decreased aggregate content. The effect of aggregate flatness is nonlinear, and its reduction trend grows gradually with the increasing flatness. The total number of failed contacts is reduced with the increasing aggregate orientation and flatness, particularly at 10 °C. The number of failed contacts that occurred in the aggregate−mastic interface in Quasi-Mode II fracturing is slightly higher than that in other fracturing modes. The aggregate distribution in the crack initiation zone greatly influenced the crack resistance, particularly at 10 °C. The research is beneficial to better understand the fracture mechanisms of asphalt concrete at low-temperature. |
| first_indexed | 2024-04-12T21:43:16Z |
| format | Article |
| id | doaj.art-599ee5b3ad984077b92f8190f1398c5f |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-12T21:43:16Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-599ee5b3ad984077b92f8190f1398c5f2022-12-22T03:15:43ZengMDPI AGMaterials1996-19442019-08-011217267510.3390/ma12172675ma12172675Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-TemperatureYinshan Xu0Yingjun Jiang1Jinshun Xue2Jiaolong Ren3School of Highway, Chang’an University, Xi’an 710064, Shaanxi, ChinaSchool of Highway, Chang’an University, Xi’an 710064, Shaanxi, ChinaSchool of Civil Engineering and Architecture, Hubei University of Arts and Science, Xiangyang 441053, Hubei, ChinaSchool of Civil and Architectural Engineering, Shandong University of Technology, Zibo 255000, Shandong, ChinaThe low-temperature crack of asphalt concrete is considered to be one of the main deteriorations in asphalt pavements. However, there have been few studies on the composite effects of the aggregate characteristics and fracturing modes on the low-temperature cracking of asphalt concrete. Hence, the edge cracked semi-circular bend tests and the discrete element modeling approaches are combined to investigate the effect of the aggregate contents, aggregate morphological features and aggregate distributions on the fracture behavior of asphalt concrete in different fracturing modes at different temperatures. The results show that the fracture toughness and the crack extended time reduce with the increasing aggregate orientation and flatness and the decreased aggregate content. The effect of aggregate flatness is nonlinear, and its reduction trend grows gradually with the increasing flatness. The total number of failed contacts is reduced with the increasing aggregate orientation and flatness, particularly at 10 °C. The number of failed contacts that occurred in the aggregate−mastic interface in Quasi-Mode II fracturing is slightly higher than that in other fracturing modes. The aggregate distribution in the crack initiation zone greatly influenced the crack resistance, particularly at 10 °C. The research is beneficial to better understand the fracture mechanisms of asphalt concrete at low-temperature.https://www.mdpi.com/1996-1944/12/17/2675asphalt concretefracture mechanismsmacroscopic and microscopiclow-temperaturefracturing modesaggregate characteristicsDEM |
| spellingShingle | Yinshan Xu Yingjun Jiang Jinshun Xue Jiaolong Ren Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature Materials asphalt concrete fracture mechanisms macroscopic and microscopic low-temperature fracturing modes aggregate characteristics DEM |
| title | Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature |
| title_full | Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature |
| title_fullStr | Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature |
| title_full_unstemmed | Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature |
| title_short | Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature |
| title_sort | investigating the effect of aggregate characteristics on the macroscopic and microscopic fracture mechanisms of asphalt concrete at low temperature |
| topic | asphalt concrete fracture mechanisms macroscopic and microscopic low-temperature fracturing modes aggregate characteristics DEM |
| url | https://www.mdpi.com/1996-1944/12/17/2675 |
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