Characterization of asphalt mixture using X-ray computed tomography scan technique after freeze-thaw cycle and microwave heating
Microwave heating technology could heal micro-cracks caused by freeze-thaw (F-T) cyclic damage. The main objectives were to recommend the optimum heating moment and evaluate the difference between two typical mixtures during F-T cycle and microwave heating based on microstructure. To this end, cyclic F-T split tests and microwave heating tests were conducted to determine the best heating moment. In addition, the internal structure was scanned using X-ray computed tomography and evaluated using digital image processing. The results indicated that the optimum timing to heal two different asphalt mixtures (AC-13 and OGFC-13) occurred when the degrees of moisture damage were 39.8% and 42.4%, respectively. AC-13 exhibited better heating uniformity, and OGFC-13 exhibited better heating transferring. Moreover, F-T damage and microwave heating could change the internal structure: three types of moisture damage were seen in the voids: pore generation, connections, and expansion; pore number, porosity, pore area, and equivalent diameter first increased after the F-T cycles and then decreased after microwave heating, but the effect for OGFC-13 was more obvious; The F-T cycles mainly increased the number of valid pores, and microwave healing mainly increased the number of invalid pores; The damage and healing process of AC-13 and OGFC-13 mainly occurred on the 0.15–1.18 mm and 0.15–4.75 mm pores. This research could contribute to maintenance cost savings and revelation of F-T damage and microwave healing mechanism.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
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Supplemental Notes:
- © 2022 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
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Authors:
- Zhang, Fan
- Cao, Yangsen
- Sha, Aimin
- Lou, Baowen
- Song, Ruimeng
- Hu, Xinkang
- Publication Date: 2022-9-5
Language
- English
Media Info
- Media Type: Web
- Features: Appendices; Photos; References; Tables;
- Pagination: 128435
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Serial:
- Construction and Building Materials
- Volume: 346
- 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 mixtures; Freeze thaw tests; Microwaves; Moisture damage; Tomography
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 01856707
- Record Type: Publication
- Files: TRIS
- Created Date: Aug 30 2022 9:18AM