Abstract
This study presents an experimental program conducted to investigate the bond strength of FRP bars in recycled-aggregate concrete compared to the one in normal-aggregate concrete for the improved evaluation of results. The experimental program contains thirty six specimens tested using direct pull-out test. In this study, glass, carbon and basalt FRP bars are used with 12 mm diameter and bar bond lengths of 5d, where d is the bar diameter. The FRP bars are casted in different recycled-aggregate concrete strengths of 30, 45 and 60 MPa. The behaviour of bars in normal-aggregate concrete strength of 30 MPa is used as a benchmark and its behaviour is compared with the ones in the recycled-aggregate concrete. The impact of the concrete strength considered is identified based on the gain in the bond behaviour. The experimental results demonstrate the prospect of the recycled aggregates applied as an alternative to normal aggregates in the FRP reinforced concrete. In addition, the use of the recycled aggregate increases the bearing friction behaviour between the FRP bars and concrete.
Highlights
Sustainability has become one of the key parameters in the construction industry
The latter study investigated the bond strength results of BFRP bars in the recycled-aggregate concrete without benchmarking the bond strength results in the normal-aggregate concrete
The results are analysed based on the influence of the concrete strength, types of concrete, and the type of the Fibre reinforced polymer (FRP) bar
Summary
Sustainability has become one of the key parameters in the construction industry. Coarse aggregates constitute around 65% by weight of a non-air entrained concrete, while cement occupies only 16% to 18% of the concrete mix by weight. Evaluating the bond of FRP bars in recycled aggregate is an essential requirement for reinforced concrete structures. There are limited studies which were carried out to investigate the performance of the recycled-aggregate concrete in FRP reinforced members. Two research studies in the available literature addressed the bond behaviour between the recycled-aggregate concrete and GFRP bars [2] and BFRP bars >3@. This study attempts to address the bond behaviour of FRP bars in the recycled-aggregate concrete using direct pull-out test. The findings from this research study are expected to increase the understanding of the bond behavior towards the recycled-aggregate concrete and its consideration in concrete design codes. Designers will be able to avoid the bar pull-out failure and to develop the full capacity of recycled-aggregate concrete members reinforced with FRP bars
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