Life performance of 40-year-old RC beams with different concrete covers and bar diameters in natural corrosion environments

Dasar, Amry; Patah, Dahlia; Hamada, Hiroyuki; Yamamoto, Daisuke; Sagawa, Yasutaka

doi:10.1016/j.istruc.2022.11.033

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…Many scholars have carried out researches on the reinforcement of reinforced concrete (RC) structures with different materials and technologies (Wakjira and Usama, 2019;Dasar et al, 2022;Massumi and Gholami, 2016) so as to meet the objective requirements of higher bearing capacity of engineering structures and solve the problems caused by construction quality, aging and corrosion of internal materials, external overload and cyclic load of existing structures (Shang et al, 2019;Motavalli et al, 2011;Kormanikova et al, 2021). At present, the commonly employed new reinforcement materials incorporate fiber-reinforced polymer (FRP) (Bodzak, 2019), ultra-high performance concrete (UHPC) (Zhang et al, 2020), textilereinforced concrete (TRC) (Rossi et al, 2022), textile-reinforced mortar (TRM) (Guo et al, 2022), etc.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Flexural behavior of RC beams reinforced by ECC layer and steel plate: numerical simulation

Liu,

Wang,

Xiao

2024

IJSI

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PurposeThe combination of an Engineered Cementitious Composite (ECC) layer and steel plate to reinforce RC beams (ESRB) is a new strengthening method. The ESRB was proposed based on the steel plate at the bottom of RC beams, aiming to solve the problem of over-reinforced RC beams and improve the bearing capacity of RC beams without affecting their ductility.Design/methodology/approachIn this paper, the finite element model of ESRB was established by ABAQUS. The results were compared with the experimental results of ESRB in previous studies and the reliability of the finite element model was verified. On this basis, parameters such as the width of the steel plate, thickness of the ECC layer, damage degree of the original beam and cross-sectional area of longitudinal tensile rebar were analyzed by the verified finite element model. Based on the load–deflection curve of ESRB, ESRB was discussed in terms of ultimate bearing capacity and ductility.FindingsThe results demonstrate that when the width of the steel plate increases, the ultimate load of ESRB increases to 133.22 kN by 11.58% as well as the ductility index increases to 2.39. With the increase of the damage degree of the original beam, the ultimate load of ESRB decreases by 23.7%–91.09 kN and the ductility index decreases to 1.90. With the enhancement of the cross-sectional area of longitudinal tensile rebar, the ultimate bearing capacity of ESRB increases to 126.75 kN by 6.2% and the ductility index elevates to 2.30. Finally, a calculation model for predicting the flexural capacity of ESRB is proposed. The calculated results of the model are in line with the experimental results.Originality/valueBased on the comparative analysis of the test results and numerical simulation results of 11 test beams, this investigation verified the accuracy and reliability of the finite element simulation from the aspects of load–deflection curve, characteristic load and failure mode. Furthermore, based on load–deflection curve, the effects of steel plate width, ECC layer thickness, damage degree of the original beam and cross-sectional area of longitudinal tensile rebar on the ultimate bearing capacity and ductility of ESRB were discussed. Finally, a simplified method was put forward to further verify the effectiveness of ESRB through analytical calculation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexural behavior of RC beams reinforced by ECC layer and steel plate: numerical simulation

Liu,

Wang,

Xiao

2024

IJSI

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“…Therefore, it is necessary to perform the accelerated corrosion test on prestressing steel bars at different levels of applied tensile stress. Since the corrosion rate of steel in atmospheric corrosion conditions is relatively slow [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], it is difficult to achieve the expected degree of corrosion in a short period of time. Therefore, electrochemical corrosion was used in the presented experimental measurements [32][33][34][35], which achieved a significant degree of corrosion in a relatively short time by analyzing the effect of corrosion on prestressing steel bars.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Prestressing Level of the Fully Threaded Anchor Bar on the Corrosion Rate

2023

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The article presents experimental research on the corrosion of prestressing steel bars with denotation CKT (fully threaded anchor bars), which are composed of high-quality prestressing steel of the grade Y 1050 (1050 MPa). The experiment was performed using an electrochemical accelerated test. The aspects of the electric current value influence, time dependence on the degree of corrosion, and especially the influence of the prestressing level in the prestressing steel bars on the degree of corrosion were observed and examined. The results of the experiment showed that if the sample was in a stressed state, its degree of corrosion increased. Specifically, for the maximal stress equal to 90% of the tensile strength, the corrosion degree was increased by approximately 7.3%, in comparison to the unstressed specimen. In this case, a 7.3% corrosion degree corresponds to a weight loss of 350 g. The theoretical degree of corrosion was calculated using Faraday’s Law, which allowed the prediction of a rough estimate of the corrosion degree obtained with known input data. The experimental results showed that there was no apparent difference in the corrosion morphology of the sample during the same time-dependent corrosion influence at the same prestressing level in the sample with the same electric current value.

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Investigation of the application scope of bond strength empirical formulas for various FRP bars in concrete: A case study utilizing the safety probability value with a large test dataset

Nam,

Hai,

Hai

et al. 2024

Case Studies in Construction Materials

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Life performance of 40-year-old RC beams with different concrete covers and bar diameters in natural corrosion environments

Cited by 6 publications

References 27 publications

Flexural behavior of RC beams reinforced by ECC layer and steel plate: numerical simulation

Flexural behavior of RC beams reinforced by ECC layer and steel plate: numerical simulation

The Influence of the Prestressing Level of the Fully Threaded Anchor Bar on the Corrosion Rate

Investigation of the application scope of bond strength empirical formulas for various FRP bars in concrete: A case study utilizing the safety probability value with a large test dataset

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