Study on fracture characteristics of recycled aggregates asphalt concrete

Recycled aggregate (RA) is a product of construction and demolition wastes, and RA particle presents low strength and adhesion with asphalt mortar compared with natural aggregate. With the aim of studying fracture characteristics of recycled aggregate asphalt concrete (RAAC), the influence of RA on interfacial zone failure should be evaluated. In this paper, RAAC with different RA percentages and gradations were prepared, and a semi-circular bending test (SCB) was employed to assess the fracture behavior of RAAC specimens. Meanwhile, strain distributions during the fracture process were measured by digital image correlation (DIC). To understand the influence of RA on fracture characteristics of RAAC, the microstructural finite element models (FEM) were established, in which natural aggregate and RA particles were reconstructed, respectively. Zero-thickness cohesive zone elements (CZM) were inserted into continuum elements so that the failure of the interface zone between asphalt mortar with different aggregate particles could be investigated. Results indicate that RA presents a significant impact on the fracture response of the asphalt mixture, and the fracture resistance of RAAC attenuates significantly as the RA percentage exceeds 50%. The aggregate-asphalt mortar interface is the first choice in competing fracture paths inside RAAC. The cement mortar-asphalt mortar interface (CAI) exhibited more significant damage than the bulk fracture within the asphalt mortar (AMI) and natural aggregate-mortar interface (NAI). Also, the damage proportion of CMI increases with RA percentage and the maximum nominal particle size of RAAC. This study shows FEM considering different types of interfacial zone provides an effective method to evaluate the fracture characteristics of RAAC.

• Record URL:
  • https://doi.org/10.1016/j.conbuildmat.2024.135431
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S0950061824005725
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
• Supplemental Notes:
  • © 2024 Published by Elsevier Ltd. Abstract reprinted with permission of Elsevier.
• Authors:
  • Hu, Jing
  • Zhao, Weixiang
  • 0009-0009-1785-4196
  • Liu, Pengfei
  • 0000-0001-5983-7305
  • Huang, Qibo
  • Luo, Sang
• Publication Date: 2024-3-15

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 135431
• Serial:
  • Construction and Building Materials
  • Volume: 419
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0950-0618
  • Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1

Subject/Index Terms

• TRT Terms: Asphalt concrete; Concrete aggregates; Fracture properties; Interfaces; Recycled materials
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01912075
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 18 2024 5:19PM