Abstract
Phenolic resin-based BFRP (P-BFRP) composites has been demonstrated to be superior to the commercial ones when being exposed to high temperature, while their strengthening effect for reinforced concrete (RC) components at ambient temperature has not been investigated. In this paper, exploration was conducted and experimental studies were mainly carried out on the flexural performance of reinforced concrete (RC) beams strengthened with P-BFRP rebars, including epoxy- (E-BFRP) and vinyl-based BFRP (V-BFRP) rebars as a comparison. Crucial characteristics of strengthened beams, especially strain variation of BFRP rebars, were analyzed, and flexural capacities were also calculated. The results showed that P-BFRP rebars can achieve a slightly better strengthening effect compared to commercial BFRP rebars. All BFRP rebars saw a less increase in strains at glue-strengthening zones, but an obvious change from cracking to failing at grouting-strengthening zone. The bonding scheme including both grouting and epoxy glue was reasonable, and sufficient to contribute a reliable anchorage to the BFRP rebars. The calculation in ACI 440.2R-08 was conservative in predicting the ultimate load capacity of the strengthened beam, while the trend of variation can be reasonably estimated. P-BFRP rebars were more effective in the case of higher concrete strength, or lower steel reinforcement ratio.
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