Analysis of correlation between real degradation data and a carbonation model for concrete structures

Benı́tez, Pablo; Rodrigues, Fernanda; Talukdar, Sudip; Gavilán, Sergio; Varum, Humberto; Spacone, Enrico

doi:10.1016/j.cemconcomp.2018.09.019

Cited by 22 publications

(15 citation statements)

References 48 publications

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“…Corrosion caused by concrete carbonation in the concrete cover usually results from the impact of the carbon dioxide in the air, as well as changes of the ambient temperature and humidity [26,27]. In reinforced concrete structures, the concrete (if sufficiently waterproofed and made with appropriate and properly mixed ingredients) provides basic and also the most efficient protection of the reinforcement [monograph].…”

Section: Corrosion Henomenamentioning

confidence: 99%

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Raczkiewicz

Kossakowski

2019

Applied Sciences

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Sprayed fiber-reinforced concrete is used in construction for the execution and repair of reinforced concrete elements. It is believed that the addition of steel fibers is most effective, due to their parameters and low costs. Some researchers, however, suggest that the addition of steel fibers can contribute to the initiation of corrosion of the main reinforcement. In consideration of the differences of opinion on the corrosion resistance of sprayed fiber-reinforced concrete, it has become necessary to analyze this issue. The article presents comparative studies of corrosion assessments of the main reinforcement in specimens made of ordinary concrete and concrete with steel fibers. The tests were performed using a semi non-destructive galvanostatic pulse method, which allows location of the areas of corrosion and estimation of the reinforcement corrosion activity. In order to initiate the corrosion processes the specimens were subjected to freezing cycles in NaCl solution. In addition, the shrinkage and compressive strength of specimens were measured, and the observation of specimen structure under a scanning microscope was performed. It was found that galvanostatic pulse method allowed estimation of the reinforcement corrosion progress. The corrosion of the main reinforcement in steel fiber reinforced concrete specimens was less advanced than in the specimens without fibers.

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Section: Corrosion Henomenamentioning

confidence: 99%

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Raczkiewicz

Kossakowski

2019

Applied Sciences

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“…The concrete compression strength test was carried out in lined with the carbonation testing day. Higher compression values have been associated with lower carbonation rate in the previous studies (Benítez et al , 2019). Also, the incorporation of shells in concretes is known to affect the compression values.…”

Section: Experimental Programmentioning

confidence: 53%

“…It should only last that long if 30 mm cover is used but still, not without a flaw. According to Benítez et al (2019), the corrosion of the reinforcement bars may have already begun even if the carbonation depth is still about 5 mm away from them. This 5 mm distance is what is called as the pre-carbonation zone in which carries the same effect as the fully carbonated zone due to the lowering of the concrete’s pH value.…”

Section: Resultsmentioning

confidence: 99%

Carbonation of concrete containing mussel (Perna viridis) shell ash

Hussin

Othman

Ibrahim

2019

JEDT

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Purpose This paper aims to investigate the use of calcined mussel shell (CMS) ash–cement mix in concrete that is found to increase the concrete resistance against carbonation. Design/methodology/approach The deposited ash from the calcination of the mussel shells at 1000°C was used to replace the ordinary Portland cement at 5 and 7 per cent of the cement weight. The test results from the control concrete specimens were compared to the test results from the experimental concrete specimens to analyse the effects due to the said replacements. Carbonation was carried out naturally in the environment where the concentration of the carbon dioxide gas was at 0.03 per cent, the relative humidity of 65 per cent and the temperature of 27°C for a maximum period of 120 days. Measurement of carbonation depth was taken in accordance to the BS EN 13295: 2004. The carbonation resistance of the concrete was assessed based on the degree of compliance with the common design life requirement of 50 years. The filler effect from the CMS was verified using the capillary absorption test (ASTM C1585: 2013) and the electron microscope. Findings Experimental concrete specimens containing 5 and 7 per cent of the CMS ash demonstrated better carbonation resistance compared to the control concrete specimens with a minimum attainable design life of 56 years which can reach a maximum of 62 years. Capillary absorption test results indicated that the concrete pores have been effected by the said filler effect and visual observation from the electron microscope confirmed, solidifying the statement. Originality/value The CMS ash is proven to contribute to the concrete’s resistance against carbonation. Also, the CMS ash is synthesized from waste materials which have contributed to the application of the green material in the concrete technology.

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“…Carbon dioxide (CO 2 ) in the atmosphere can penetrate it and react, in the presence of moisture, with calcium hydroxide (CH). This diffusion of CO 2 within the concrete porosity is one of the most common aggressive agents to structures in urban environments (Khunthongkeaw, Tangtermsirikul and Leelawat, 2006;Tan et al, 2008;Omikrine-Metalssi and Aït-Mokhtar, 2009; Tutikian e Helene, 2011; Omikrine-Metalssi et al, 2012;Benítez et al, 2019).…”

Section: Engenharia Civilmentioning

confidence: 99%

Proposal of a method for service life prediction of a concrete structure: a case study

2020

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This article presents a method for service life prediction of concrete structures. The proposed method aims to estimate the performance of a concrete structure through its permeability to carbon dioxide penetration, in order to verify its accordance to Brazilian standards. This case study is based on an inspection made in an educational building in the city of Porto Alegre, Rio Grande do Sul, Brazil. Through carbon dioxide penetration, non-destructive and partial destructive tests, an estimated service life design for the concrete structure was elaborated. These tests were carried out in the parking lot because there is a greater vulnerability of the structure in terms of concentration of vehicles and lack of finishing, such as mortars or paints. The tests carried out showed that the selected concrete pieces were carbonated from 2.9 to 4.4 mm deep, a situation whose prognosis suggests a superior performance in accordance with the parameters set in ABNT NBR 15575:2013.

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Analysis of correlation between real degradation data and a carbonation model for concrete structures

Cited by 22 publications

References 48 publications

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Electrochemical Diagnostics of Sprayed Fiber-Reinforced Concrete Corrosion

Carbonation of concrete containing mussel (Perna viridis) shell ash

Proposal of a method for service life prediction of a concrete structure: a case study

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