Experimental and theoretical study of bond behaviour between FRP bar and high-volume fly ash-self-compacting concrete

Abstract

The combination of fibre-reinforced poly mer (FRP) and high-volume fly ash self-compacting concrete (HVFA-SCC) reinforced is expected to solve the problem of steel corrosion in traditional structures and develop sustainable infrastructures. Bond beha viour has a strong effect on serviceability of FRP reinforced concrete structures. To achieve the accep tance of this novel composite structures in practical construction and design, it is significantly important to investigate the bond behaviour of FRP reinforced HVFA-SCC. In this study, a series of pull-out tests were carried out to investigate the bond behaviour of HVFA-SCC reinforced by FRP bar, which included bond strength, bond-slip response, and failure mode. The investigated experimental variables were

Experimental Investigation and Artificial Neural Network Based Prediction of Bond Strength in Self-Compacting Geopolymer Concrete Reinforced with Basalt FRP Bars

“…It can be observed that at the same embedment length of 5 d b , BFRP behaved like steel bar, reporting almost 72% of the bond strength of steel. The higher bond strength exhibited by steel bars can be attributed to the higher axial stiffness and ribbed surface of the steel bars in comparison to the basalt FRP bars [3]. In this study, the 6-mm BFRP bars reported a lower bond strength, where the bars pulled out earlier due to the greater ultimate tensile strength of the bars in comparison with the bonding force between the bars and the surrounding concrete, as reported in a study by Wang et al [28].…”

“…It is significant to note that the predominant type of failure in this study is the pull-out failure of specimens. This can be attributed to the sufficiently thick concrete cover provided to the pull-out specimens [3].…”

“…Prior to the preparation of the cubic moulds, the basalt FRP bars were marked and fixed in the steel socket using a strong adhesive named HILTI RE500 for better grip in the socket, unlike the conventional cement grout method. The use of an epoxy adhesive of this kind will prevent the failure of FRP bars due to the gripping force of the clamps in the universal testing machine during testing [3]. The basalt FRP bars gripped in the steel socket tubes were left to dry for one week.…”

“…Therefore, it has become necessary to adopt alternate construction materials which are sustainable and durable at the same time. The use of sustainable geopolymer concrete in conjunction with fibre-reinforced polymer (FRP) bars ought to resolve the corrosion issues of traditional reinforced structures [3]. However, in order to achieve wider acceptance for this novel composite structure, it is necessary to investigate the serviceability properties of FRP-reinforced concrete structures, including factors such as deflections and crack widths [1,3].…”

“…The use of sustainable geopolymer concrete in conjunction with fibre-reinforced polymer (FRP) bars ought to resolve the corrosion issues of traditional reinforced structures [3]. However, in order to achieve wider acceptance for this novel composite structure, it is necessary to investigate the serviceability properties of FRP-reinforced concrete structures, including factors such as deflections and crack widths [1,3]. The formation of crack width and deflections is often governed by the reinforcement bar spacing and bond behaviour [4,5]; this necessitates the need for more studies on the bond behaviour of the newly developed composite.…”