Flexural behavior of seawater sea-sand coral concrete–UHPC composite beams reinforced with BFRP bars

Zhiqiang Dong, Gang Wu, Hong Zhu, Xiao Ling Zhao, Yang Wei, Hao Qian

Research output: Journal article publicationJournal articleAcademic researchpeer-review

63 Citations (Scopus)


A new type of cost-efficient concrete beam that is suitable for island environments, namely, a seawater sea-sand coral concrete (Coral-SWSSC)–ultrahigh-performance concrete (UHPC) composite beam reinforced with basalt fiber-reinforced polymer (BFRP) bars, was proposed in this paper. In these beams, the top 1/8 of the Coral-SWSSC was replaced with UHPC, and both the longitudinal bars and the stirrups were BFRP reinforcements. In addition, a new type of BFRP-wrapped steel tube (BWST) was placed in the tension zone of the beams as additional tensile reinforcement to further increase the performance. The test results showed that compared with the pure BFRP bar-reinforced Coral-SWSSC beams, the new hybrid beams exhibited much better comprehensive bending performance. The ultimate bending capacity, ultimate displacement, and energy consumption were effectively improved by adopting the UHPC replacement layer alone, and the flexural stiffness was improved significantly by adopting the BWST alone. However, when the UHPC replacement layer and the BWST were adopted simultaneously, the abovementioned performance metrics were all improved. The new hybrid beam proposed in this paper has good future application prospects in remote island environments.

Original languageEnglish
Article number120279
JournalConstruction and Building Materials
Publication statusPublished - 30 Dec 2020
Externally publishedYes


  • Basalt fiber-reinforced polymer (BFRP)
  • BFRP-wrapped steel tube (BWST)
  • Flexural behavior
  • Seawater sea-sand coral concrete (Coral-SWSSC)
  • Ultrahigh-performance concrete (UHPC)

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science


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