Statistical analysis of the carbonation coefficient in open air concrete structures

Monteiro, I.; Branco, Fernando A.; Brito, Jorge de; Neves, R.

doi:10.1016/j.conbuildmat.2011.10.028

Cited by 113 publications

(62 citation statements)

References 12 publications

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“…According to Indian standards (IS 456:2000), the concrete cover to be used in Bangalore is 30 mm since the structures are exposed to moderate exposure condition. This is in agreement with the findings that for 60-years designed service life structure in moderate environment shall have at least 30 mm concrete cover to protect steel reinforcement from early corrosion initiation (Monteiro et al, 2012). According to Monteiro model, the average carbonation coefficient in good concrete exposed to moderate environment should be 3.73 mm /year0.5 in good concrete.…”

Section: Resultssupporting

confidence: 77%

“…The average carbonation coefficient in the structures surveyed is found to be 3.83mm/year 0.5 . This is 0.07mm/year 0.5 higher compared to carbonation coefficient of 3.76 mm/year 0.5 (Monteiro et al, 2012), In Fig. 4 the difference of carbonation coefficient in surveyed structures from Monteiro findings with the present study was due to poor quality of concrete to control the rate of carbonation but also it is an indication of high carbon dioxide concentration in the atmospheric environment in question.…”

Section: Figmentioning

confidence: 74%

“…Since the overall foundation tests were satisfactory hence settlement has no effect on cracks commonly observed on members of structures surveyed. The concrete cover ranged between (12-50) mm, more than 67% of the structures surveyed had concrete cover thickness less than 30mm and this is inadequate concrete cover to control the ingress of corrosive environment for long time (Monteiro et al, 2012).…”

Section: Figmentioning

confidence: 99%

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Carbonation-induced corrosion minimization in steel reinforced concrete structures

Abaho

2017

Int. j. adv. appl. sci

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The aim of the work was to find out the corrosion condition, cause and remedial solution for reinforced concrete structures located at non coastal regions. Concrete cover thickness ranged from 12cm to 50cm. Rebound hammer strength ranged from (12-28) N/mm2. The pH ranged between 8 and 12 but 85% of pH was below 10. Results show that for corrosion conditions more than 80% quai-situation value lay between (-0.420 and 0.380) VCSE which indicates high probability of corrosion of reinforcement. Real structures surveyed also indicated that they were devoid of maintenance schedules. Irrespective of structural member, survey data on analysis indicate an average carbonation coefficient (K) of 3.83mm/year 0.5 in concrete structure exposed to Bangalore atmosphere. Hence, the study indicates that regular maintenance schedules for reinforced concrete structures are essential with preventive approach. Carbonation induced corrosion was accelerated by 490ppm concentration of Carbon dioxide in the surrounding environment of the surveyed structures. It was facilitated by the deficiency in construction practices like inadequate concrete cover, high w/c ratio hence poor quality of concrete in general.

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Section: Resultssupporting

confidence: 77%

Section: Figmentioning

confidence: 74%

Section: Figmentioning

confidence: 99%

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Carbonation-induced corrosion minimization in steel reinforced concrete structures

Abaho

2017

Int. j. adv. appl. sci

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“…The following solutions based on literature are proposed to increase concrete carbonation resistance (Khunthongkeaw et al 2006;Fattuhi 1986;Monteiro et al 2015). When concrete structures are subject to carbonation, their performance degrades due to the corrosion of reinforcement bars.…”

Section: Solutions To the Concrete Carbonation Problemmentioning

confidence: 99%

Performance Based Evaluation of Carbonation Resistance of Concrete According to Various Curing Conditions from Climate Change Effect

Kim

Choi

Kim

et al. 2017

Int J Concr Struct Mater

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Recently, extreme climate change has been occurring globally not only in the simple form of temperature increases but also in a wide range of extreme climatic events, such as abnormal drought conditions and frequent typhoons. Among these various events, the greatest problem is found in global warming. The earth's temperature has risen since the period of rapid industrial growth in the 1970s, and global warming occurs at the local level of regions and cities as well as the national level. The greenhouse gases that influence global warming include various types of chemical components, such as carbon dioxide (CO 2 ), perfluorocarbons (PFCs), nitrous oxide (N 2 O), and methane (CH 4 ). In addition, climate change is extending the construction period of concrete structures. Whereby increasing related economic losses. Pushing through construction projects without considering climate change is leading to concrete quality deterioration, causing poor constructions and consequently resulting in humans casualties and property damage. In particular, atmospheric CO 2 generates calcium carbonate by reacting with concrete hydration products. This result is reinforcing bar corrosion and concrete durability reduction due to lowered alkalinity. Therefore, in this study, concrete durability performance with respect to carbonation resistance from curing conditions change due to wind speed and sunlight exposure time is evaluated. Based on concrete carbonation resistance data obtained using curing conditions of various wind speed and sunlight exposure time, performance based evaluation (PBE) is performed using the satisfaction curve (SC) developed from the carbonation resistance test results. Using the developed PBE of concrete performance, future concrete performance is predicted based on future climate scenario. Also, the concrete mix design solutions to the concrete performance degradation due to climate change effect is proposed.

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“…The most common model used by most of the researchers (e.g. mentioned before [6][7][8][9][10][11][12][13][14][15][16][17]) as a basic model that determines the depth of carbonation, x after the time of exposure, t can be expressed in the form:…”

Section: Carbonation Models 41 Traditional Approach To Mathematicalmentioning

confidence: 99%

Cost-effective design of reinforced concrete with use of self-terminated carbonation model

Woyciechowski

Sokołowska

2016

MATEC Web Conf.

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Abstract. According to Eurocodes EC0 and EC2 designing of concrete structure durable in terms of carbonation is assured by selection of suitable thickness of reinforcement concrete cover. The selection is done on the basis of structure category and concrete strength class, regardless of the concrete material composition or technological type, thus selected value is an estimation, often exaggerated. The paper presents elaborated "selfterminated carbonation model" that includes abovementioned factors and enables to indicate the maximal possible depth of carbonation. The model, in contrast to parabolic models published in the literature, is a hyperbolic function of carbonation depth in time. The paper explains why such model describes the phenomenon of carbonation better than others. The paper contains an example of calculation of the cover thickness using that model.

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Statistical analysis of the carbonation coefficient in open air concrete structures

Cited by 113 publications

References 12 publications

Carbonation-induced corrosion minimization in steel reinforced concrete structures

Carbonation-induced corrosion minimization in steel reinforced concrete structures

Performance Based Evaluation of Carbonation Resistance of Concrete According to Various Curing Conditions from Climate Change Effect

Cost-effective design of reinforced concrete with use of self-terminated carbonation model

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