Using post-cracking strength to determine flexural capacity of ultra-thin whitetopping (UTW) pavements

Utilizing fibrillated polypropylene fibers (FPP) in Ultra-thin whitetopping (UTW) has become increasingly popular to improve the flexural capacity of concrete slabs. The calculated flexural strength (i.e., modulus of rupture (MOR)) depends on the elastic formula of ASTM C78 does not illustrate the fiber’s benefits. Therefore, the concept of effective modulus of rupture (MOReff.) that is determined from the equivalent flexural strength ratio has been used to quantify the added flexural capacity of fibers on unreinforced concrete. The purpose of this study is to investigate the benefits of testing the FRC/asphalt composite beam on the flexural capacity of UTW. Three main parameters have been taken into consideration: FPP content, pavement thickness, and failure mode. Furthermore, comparison was made to verify the effectiveness of composite beams for flexural capacity. Six different cases of concrete beams and ten cases of FRC/asphalt composite beams were performed. The results of the composite beam showed that the flexural capacity was higher than the capacity of the concrete layer. In addition, using FPP in the composite beams improved the MOReff. The results also revealed that testing UTW under noncommon failure modes did not reflect the real flexural capacity of UTW. The required UTW thickness depends on the proposed flexural capacity of the composite beam being less than the required thickness that is calculated depends on the concrete beam.

• Record URL:
  • https://doi.org/10.1016/j.conbuildmat.2019.117831
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S0950061819332842
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
• Supplemental Notes:
  • © 2019 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Suksawang, Nakin
  • Alsabbagh, Ahmed
  • 0000-0001-6355-3532
  • Shaban, Alaa
  • Wtaife, Salam
• Publication Date: 2020-4-20

Language

• English

Media Info

• Media Type: Web
• Features: Figures; Photos; References; Tables;
• Serial:
  • Construction and Building Materials
  • Volume: 240
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0950-0618
  • Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1

Subject/Index Terms

• TRT Terms: Composite pavements; Fiber reinforced concrete; Flexural strength; Polymer fibers; Polypropylene; Whitetopping
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01728448
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 28 2020 9:46AM