Identification of damage mechanisms during splitting test on SFP at different temperatures based on acoustic emission

While as a jointless cementitious asphalt material, semi-flexible pavement material (SFP) behaves well in rutting resistance, cracking has been a major barrier in its application promotion. Although many material modifications have been proved effective to improve SFP’s performance to some degree, it is still unclear what the crack mechanism is and whether it is similar in asphalt concrete until now. Thus, splitting test was conducted on SFP at three different temperatures (−10 °C, 10 °C and 25 °C) to investigate SFP’s damage process. Acoustic Emission (AE) technique was employed at the same time to collect signals from various of damage sources. An unsupervised method, k-means, was used to classify AE data. The X-ray scanning images of the samples after fracture were observed to assist in cluster identification, together with the images of the fracture cross sections. Three damage mechanism clusters were identified as skeletal aggregate moving friction, together with cement cracking, asphalt cohesive damage and debonding. The result reveals that SFP cracks more easily at 25 °C. There is a temperature effect in the damage process of SFP: the damage mode shifts from main macro-crack to distributed meso-cracks, as well as from interface debonding, aggregate cracking to asphalt/cement damage. Besides, the absolute energy development of each cluster indicates that damage in cement caused by uncoordinated deformation contributes much to capability loss in SFP at 25 °C.

• Record URL:
  • https://doi.org/10.1016/j.conbuildmat.2020.121391
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S095006182033395X
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
• Supplemental Notes:
  • © 2020 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Cai, Xing
  • Shi, Chenguang
  • Chen, Xianhua
  • Yang, Jun
  • 0000-0001-8407-8427
• Publication Date: 2021-2-8

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Pagination: 121391
• Serial:
  • Construction and Building Materials
  • Volume: 270
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0950-0618
  • Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1

Subject/Index Terms

• TRT Terms: Acoustic emission tests; Cracking; Flexible pavements; Pattern recognition systems; Paving materials; Temperature
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01761030
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 22 2020 9:36AM