Abstract
Efficient load transmission between concrete and steel reinforcement by bonding action is a key factor in the process of the design procedure of bar-reinforced concrete structures. To enhance the bond strength of steel/concrete composites, the impact of graphene nanoplatelets (GnP) on the bond stress and bond stress–slip response of deformed reinforcement bars, embedded in high-performance concrete (HPC), was investigated using bar pullout tests. In the current study, 36 samples were produced and examined. The main variables were the percentages of GnP, the steel reinforcement bar diameter, and embedded length. Bond behavior, failure mode, and bond stress-slip response were studied. Based on the experimental findings, the inclusion of GnP had a significant favorable influence on the bar-matrix interactions due to the bridging action of GnP as a nano reinforcement. For 0.02 wt.% of GnP, the bond strength was enhanced by more than 41.28% and 53.90% for steel bar diameters of 10 and 16 mm, respectively. The HPC-GnP mixture displayed a reduction in the initial slippage in comparison to the control sample. The test findings were compared to the prediction models created by other researchers and the ACI 408R-12 code.
Highlights
Concrete, the most widely used building material, has long been able to meet the growing needs of mankind
graphene nanoplatelets (GnP) enhanced the cohesiveness between the steel bar and concrete, resulting in a pullout force that was greater than the steel failure load
The bond stress behavior of high-performance concrete (HPC) containing GnP was investigated in the current study using 36 samples
Summary
The most widely used building material, has long been able to meet the growing needs of mankind. Previous studies have shown that bond stren of concrete around the bar, embedded length, reinforcement in the transverse direction that confines concrete, and the bar shape [6,7,8,9,10,11]. The compressive strength of the co concrete and steel is to study the evolution of the bond stress-slip typically achieved using conventional bar pullout tests [12]. Several researchers examined the bond strength of ness of concrete around the bar, embedded length, HSC and HPC. Chen et al [35] indicated that Graphene Oxide (GO) can improve the compressive strength, flexural strength, and elasticity modulus of concrete by 4.04–12.65%, 3.8–7.38%, and 3.92–10.97%, respectively. The parameters affecting the bond strength (i.e., bar diameter, embedded length of the bar, and the effect of different dosage percentages of GnP) were examined. The pullout test results were analyzed, and the reliability of available models was studied
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