Flexural behaviour of hybrid fibre-reinforced recycled aggregate concrete beams with BFRP bars and steel-BFRP composite bars (SBCBs)
Year: 2024
Type: article
Abstract: Structural application of recycled aggregate concrete (RAC) remains limited due to its reduced strength, durability and ductility compared to natural aggregate concrete (NAC). To overcome these shortcomings, macro-basalt fibres and recycled macro-polypropylene fibres have recently been used to reinforce RAC. In this study, beams made from the developed hybrid fibre-reinforced recycled aggregate concrete (FRRAC) reinforced with basalt fibre-reinforced polymer (BFRP) bars or steel-BFRP composite bars (SBCBs) were fabricated and tested. The flexural performance of 11 beams (including 1 NAC, 5 RAC and 5 FRRAC) with steel, BFRP bars and SBCBs was assessed through a 4-point bending test. The assessed parameters included reinforcement types/ratios and the additional of hybrid fibres. Failure modes, load-deflection response, stress-strain curves, and ductility coefficients of displacement and energy absorption were analysed. BFRP bars and SBCBs significantly increased the beam failure loads by 61 % and 34 %, respectively, compared to steel reinforcement. Hybrid fibres increased the peak loads of BFRP and SBCB-reinforced RAC beams by 33 % and 19 %, respectively, with stiffness improvement by 24 % in BFRP-reinforced beams. Ductility coefficients nearly doubled for SBCB-reinforced beams with hybrid fibres. New empirical formulae were proposed to predict the load-deflection response of RAC and FRRAC beams reinforced with BFRP bars or SBCBs.
Source: Structures
Authors: Paing Htet, Wensu Chen, Zhijie Huang, Hong Hao
Institutions: Curtin University, Guangzhou University
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,160
Funder: Australian Research Council
OpenAlex ID: W4403483347