Effect of fly ash and corrosion on bond behavior in reinforced concrete

Zhou, Qingsong; Lu, Chunhua; Wang, Wei; Wei, Shenghuai; Xi, Bangfa

doi:10.1002/suco.201900264

Cited by 9 publications

(4 citation statements)

References 25 publications

(51 reference statements)

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“…When the steel surface was in contact with sodium chloride, the oxidation reaction was taken place and the electrons were generated. To maintain the equilibrium, the electrons were consumed by the cathode unit of metal sheets which formed the hydrogen molecules [20,21]. Tese hydrogen molecules are surrounded near the surface of the steel bars and hold back the generation of electrons from the anode unit in which the state of the cathode is known as the polarized state.…”

Section: Degree Of Corrosionmentioning

confidence: 99%

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Mohana¹,

Selvaganesh²,

Issac³

et al. 2023

Advances in Materials Science and Engineering

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Corrosion in steel leads to the deterioration of reinforced concrete structures due to chemical reactions between steel and its surrounding atmosphere. In this paper, a novel anticorrosive powder was derived from the waste Printed Circuit Board (PCB) and manually coated on the steel rebar of the reinforced concrete specimen. The corrosion-resistant efficiency of the developed nano PCB-coating on the steel bars was studied by polarization, electrochemical impedance spectroscopy, and accelerated corrosion technique. Also, the applicability of the nano PCB-coated rebar as reinforcement in the concrete environment was investigated. From the results, it was observed that the nano PCB-coated specimens exhibited 3.5 times reduced rate of corrosion and lost only 46.15% strength and 52.5% diameter under the accelerated rate of 6 V after 48 hours. The presence of nano PCB powder improved the corrosion-resistant behaviour of the steel rebar by 1.65 times of the noncoated specimen. Also, the nano PCB-coating reduced the loss in residual yield strength of the corroded steel rebar by 32% lesser than the noncoated specimens and exhibited similar corrosion-resistant properties as that of the existing zinc coating. In addition to the corrosion resistance, the nano PCB-coated steel rebar exhibited almost similar adhesion with concrete as that of the commercial zinc coating which is 7% lower than uncoated steel rebars. It was inferred from this research work that the proposed anticorrosive coating prepared from the waste nano PCB powder showed better corrosion-resistant behaviour and reduced the overall cost of coating by 42%, which ensures economy and serviceability.

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Section: Degree Of Corrosionmentioning

confidence: 99%

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Mohana¹,

Selvaganesh²,

Issac³

et al. 2023

Advances in Materials Science and Engineering

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show abstract

“…where t is the time, s; x is the distance, m; and D is the diffusion coefficient, m 2 /s. Set the initial condition C(x, 0) = C 0 , the boundary condition C(0, t) = C s , and obtain the analytical solution of Fick's second law [30].…”

Section: Fick's Second Lawmentioning

confidence: 99%

Experimental Study and Numerical Analysis of Chloride Ion Diffusion in Hydrotalcite Concrete in Chloride Salt Environment

Zhou,

Cai,

2023

Materials

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Hydrotalcite, known as layered double hydroxides (LDHs), is a new type of admixture used to delay the corrosion of reinforcement. The aim of this study was to investigate the chloride ion diffusion behavior of C30 concrete with varying amounts of calcined hydrotalcite (0%, 2%, 4% and 6%) in a chloride salt environment. The NT-Build 443 test was adopted to characterize the one-dimensional accelerated chloride ion penetration of concrete. The distribution of chloride ion concentration in hydrotalcite concrete with different mix proportions immersed in sodium chloride solution for 30 days and 60 days was determined, and the chloride ion diffusion coefficient and surface chloride ion concentration were fitted based on Fick’s second law to establish the chloride ion diffusion model considering the influence of multiple factors. This model was validated using COMSOL Multiphysics finite element software. The results show that concrete mixed with LDHs can meet its compressive strength requirements and that the resistance of concrete with 2% calcined hydrotalcite to chloride ion penetration is the best with a 19.6% increase in the 30-day chloride ion penetration coefficient. The chloride ion diffusion process under chloride salt immersion conditions is in accordance with Fick’s second law. The chloride ion concentrations calculated with COMSOL software and the test results are in good agreement, which verifies the reliability of the chloride ion diffusion model.

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“…23 In recent years, a considerable amount of research on the bond performance of concrete and rebars has been conducted on coral-reef-sand concrete, recycled aggregate concrete, high-strength concrete, reactive powder concrete, steel fiber highstrength ceramsite concrete, retard-bonded prestressed concrete, and concrete under high temperature conditions. [23][24][25][26][27][28][29][30][31][32] In addition to the type of concrete, various other factors can affect the bond performance between concrete and rebars and have been extensively studied, 33,34 such as the anchorage length, resistance to splitting crack development provided by the concrete cover, 34,35 bar diameter, 36 rib geometry, 37 rebar corrosion and cracking widths, 38 interfacial fracture energy at the rebar-concrete interface, 39 confinement provided by transverse reinforcement, 40 and transverse compression and casting positions of concrete members. 41 The question of how the bond performance is affected by different types of iron tailing concrete (ITC) is an important basis for the application of ITC in engineering.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations of the bond strength between iron tailing concrete and steel bars

Chen,

Duan,

Yang

et al. 2023

Structural Concrete

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Fly ash, river sand, and ordinary gravel, which are used in concrete as the admixture, fine aggregate, and coarse aggregate, respectively, were replaced by iron tailing powder, sand, and gravel. The influence of the iron tailings on the bond properties between concrete and steel bar was studied by conducting pull‐out tests on 16 groups and 48 specimens. At a curing age of 90 days, the splitting tensile strength of the iron tailing powder concrete (ITPC) for strength grades C25 and C30 was the lowest and was only 71.8% and 66.6% of the splitting tensile strength for the corresponding strength grade of conventional concrete (CC). The lower splitting tensile strength of ITPC caused the bond strength between the concrete and steel bar to be lower than that between the CC and steel bar, with a maximum difference of 14.67%. The bond strength between the iron tailing powder–sand concrete (ITPSC) and steel bar was slightly worse than that between the CC and steel bar, with a maximum difference of 6.88%, and better than that between the ITPC and steel bar. The bond strength between the full iron tailing concrete and steel bar was better than those between the CC and steel bar and between the ITPSC and steel bar. In addition, the bond slip characteristics were investigated.

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Effect of fly ash and corrosion on bond behavior in reinforced concrete

Cited by 9 publications

References 25 publications

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Corrosion Resistant Coating from Nano Printed Circuit Board Powder for the Reinforced Concrete Structures

Experimental Study and Numerical Analysis of Chloride Ion Diffusion in Hydrotalcite Concrete in Chloride Salt Environment

Experimental investigations of the bond strength between iron tailing concrete and steel bars

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