An 18-Month Analysis of Bond Strength of Hot-Dip Galvanized Reinforcing Steel B500SP and S235JR+AR to Chloride Contaminated Concrete
Autor: | M. Jaśniok, J. Kołodziej, Krzysztof Gromysz |
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Rok vydání: | 2020 |
Předmět: |
LPR
Materials science zinc coating HDG 0211 other engineering and technologies Rebar 020101 civil engineering 02 engineering and technology engineering.material Chloride lcsh:Technology chlorides Article 0201 civil engineering Corrosion law.invention Stress (mechanics) symbols.namesake reinforcing steel Coating law 021105 building & construction medicine pullout optical measurements General Materials Science 3D scanning Composite material lcsh:Microscopy lcsh:QC120-168.85 bond strength corrosion EIS lcsh:QH201-278.5 Bond strength lcsh:T Galvanization lcsh:TA1-2040 symbols engineering concrete lcsh:Descriptive and experimental mechanics Adhesive lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 medicine.drug |
Zdroj: | Materials Materials, Vol 14, Iss 747, p 747 (2021) Volume 14 Issue 4 |
ISSN: | 1996-1944 |
Popis: | This article describes the comparative analysis of tests on bond strength of hot-dip galvanized and black steel to concrete with and without chlorides. The bond effect was evaluated with six research methods: strength, electrochemical (measurements of potential, EIS and LPR), optical, and 3D scanning. The tests were conducted within a long period of 18 months on 48 test elements reinforced with smooth rebars ϕ8 mm from steel grade S235JR+AR and ribbed rebars ϕ8 mm and ϕ16 mm from steel grade B500SP. The main strength tests on the reinforcement bond to concrete were used to compare forces pulling out galvanized and black steel rebars from concrete. This comparative analysis was performed after 28, 180, and 540 days from the preparation of the elements. The electrochemical tests were performed to evaluate corrosion of steel rebars in concrete, particularly in chloride contaminated concrete. The behaviour of concrete elements while pulling out the rebar was observed using the system of digital cameras during the optical tests. As regards 3D scanning of ribbed rebars ϕ8 mm and ϕ16 mm, this method allowed the detailed identification of their complex geometry in terms of determining the polarization area to evaluate the corrosion rate of reinforcement in concrete. The test results indicated that the presence of zinc coating on rebars had an impact on the parameters of anchorage. In the case of ribbed rebars of 16 mm in diameter, the maximum values of adhesive stress and bond stiffness were reduced over time when compared to black steel rebars. Moreover, it was noticed that the stiffness of rebar anchorage in chloride contaminated concrete was considerably higher than in concrete without chlorides. |
Databáze: | OpenAIRE |
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