Shear behaviour of lightweight concrete beams strengthened with CFRP composite

Al-Allaf, MHF; Weekes, L; Augusthus Nelson, L

Abstract

This paper presents the experimental results obtained from lightweight and normal concrete beams with closed and U-shaped configurations of epoxy bonded Carbon FRP (CFRP) reinforcement in order to compare the shear resisting mechanisms between lightweight and normal concrete beams. The experimental results show that the CFRP can successfully be applied in the strengthening of lightweight concrete beams and the shear strength gained due to CFRP reinforcement for lightweight samples is less than the normal weight concrete samples while the mode of failures are the same. In contrast, diagonal shear cracks propagate through the lightweight aggregate compared to cracks around normal aggregate in the concrete matrix. Furthermore, the numerical study shows that the design guidelines to estimate the CFRP contribution, which do not differentiate the concrete types, overestimate the U-shaped CFRP contribution on lightweight concrete beams where the effective bond length of CFRP could not be achieved due to lower tensile strength of lightweight concrete.

Citation

Al-Allaf, M., Weekes, L., & Augusthus Nelson, L. (2019). Shear behaviour of lightweight concrete beams strengthened with CFRP composite. Magazine of Concrete Research, 71(18), 949-964. https://doi.org/10.1680/jmacr.17.00488

• Journal Article Type: Article
• Acceptance Date: May 18, 2018
• Online Publication Date: May 25, 2018
• Publication Date: Sep 1, 2019
• Deposit Date: May 29, 2018
• Publicly Available Date: May 25, 2019
• Journal: Magazine of Concrete Research
• Print ISSN: 0024-9831
• Electronic ISSN: 1751-763X
• Publisher: Thomas Telford
• Volume: 71
• Issue: 18
• Pages: 949-964
• DOI: https://doi.org/10.1680/jmacr.17.00488
• Publisher URL: https://www.icevirtuallibrary.com/doi/abs/10.1680/jmacr.17.00488
• Related Public URLs: https://www.icevirtuallibrary.com/toc/jmacr/0/0