Research on Expanded Clay Aggregates Breakdown of Lightweight Asphalt Concrete

Effects of aggregates fragmentation on performance of lightweight asphalt concrete are studied in this paper. The Marshall mixture design method was used to determine the optimum asphalt content of lightweight SMA-13 (LSMA-13). Gyratory compaction test was taken to simulate aggregates crushing. British Pendulum Tester, sand patch method, rutting test, indirect tensile strength test, freeze-thaw splitting test and soaked Marshall stability test were adopted to study the effects of aggregates fragmentation on friction, high temperature stability, low temperature crack resistance and moisture susceptibility of LSMA-13, respectively. The results show that lightweight aggregates have little effects on the fragmentation of basalt aggregates whose particle size is larger than that of lightweight aggregates, but can prevent the basalt aggregates whose particle size is smaller than that of lightweight aggregates from breaking. The number of gyrations and the replacement percentage of lightweight aggregates have negative effects on the aggregates fragmentation index (AFI) of LSMA-13. LSMA-13 have good skid resistance and the effects of aggregates fragmentation on friction of lightweight asphalt concrete are not obvious. The larger the AFI value is, the smaller the dynamic stability (DS) is. And when AFI is larger than 6%, DS of LSMA-13 is smaller than DS criteria (3000mm -1). 6% can be used as the AFI criterion of LSMA-13 for pavement engineering. Moreover, the effects of aggregates fragmentation on low temperature crack resistance of LSMA-13 are not obvious. The replacement percentage of lightweight aggregates of LSMA-13 has negative effect on its low temperature crack resistance. And the aggregates fragmentation of LSMA-13 has positive effect on its moisture susceptibility. LSMA-13 are not recommended to be applied in cold regions engineering, but are recommended to be applied in rainy regions engineering.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures. Alternate title: Research on Aggregates Fragmentation of Lightweight Asphalt Concrete
• Authors:
  • Zhang, Meng
  • Qian, Zheng-dong
  • Zhou, Ya-dong
  • Zhang, Xiang-fei
• Conference:
  • Transportation Research Board 97th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2018-1-7 to 2018-1-11
• Date: 2018

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 9p

Subject/Index Terms

• TRT Terms: Asphalt concrete; Cracking of asphalt concrete pavements; Expanded clay aggregates; Lightweight concrete; Moisture damage; Pavement performance
• Uncontrolled Terms: Fragmentation
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01660857
• Record Type: Publication
• Report/Paper Numbers: 18-00522
• Files: TRIS, TRB, ATRI
• Created Date: Feb 22 2018 9:16AM