Field assessment of the relationship between natural and accelerated concrete carbonation resistance

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

doi:10.1016/j.cemconcomp.2013.04.006

Cited by 107 publications

(48 citation statements)

References 24 publications

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“…The carbonation depth measured on mixture C5 produced with higher w/c ratio was almost twice the one performed by mixtures C1 and C3 (Table 6). Increased vulnerability of blended cement concretes produced with higher w/c ratios is in accordance of findings of other researches [5,6].…”

Section: Carbonation Depthsupporting

confidence: 80%

Influence of cement type on carbonation of concrete mixtures

et al. 2018

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Abstract. This research aims to investigate the influence of cement type to carbonation. For this purpose mixtures of four different cement mortars and eight different concretes that have been prepared with four different cements were left exposed for one year in open air in northern Greece. Results indicate that the type of cement influences the carbonation rate. Concrete mixtures produced according to the definitions of EN 206 standard perform lower service life against carbonation induced corrosion if the choice of the cement type is not carefully examined.

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Section: Carbonation Depthsupporting

confidence: 80%

Influence of cement type on carbonation of concrete mixtures

et al. 2018

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“…Correlation coefficients (R 2 ) for regressions between accelerated versus natural carbonation exhibit an intermediate correlation of 0.6. Neves et al [10] have also observed a reasonable correlation between carbonation coefficients for natural and accelerated exposures, but with a significantly higher accelerated carbonation coefficient due to their exposure to a 5 % CO 2 environment. Conversely, as shown in Fig.…”

Section: Resultsmentioning

confidence: 91%

“…Thus, it was of interest to investigate their effect on another primary concrete degradation process, carbonation. A secondary interest of the present study was to investigate any relationships between the performances of concretes exposed to either accelerated or natural carbonation environments [10].…”

Section: Introductionmentioning

confidence: 99%

Accelerated and natural carbonation of concretes with internal curing and shrinkage/viscosity modifiers

et al. 2014

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In many parts of the world, corrosion of reinforcing steel in concrete induced by carbonation of the concrete continues to be a major durability concern. This paper investigates the accelerated and natural carbonation resistance of a set of seven concretes, specifically evaluating the effects of internal curing and/or shrinkage/viscosity modifiers on carbonation resistance. In addition to five different ordinary portland cement (OPC) concretes, two concretes containing 20 % of a Class F fly ash as replacement for cement on a mass basis are also evaluated. For all seven concrete mixtures, a good correlation between accelerated (lab) and natural (field) measured carbonation coefficients is observed. Conversely, there is less correlation observed between the specimens' carbonation resistance and their respective 28 days compressive strengths, with the mixtures containing the shrinkage/viscosity modifier specifically exhibiting an anomalous behavior of higher carbonation resistance at lower strength levels. For both the accelerated and natural exposures, the lowest carbonation coefficients are obtained for two mixtures, one containing the shrinkage/viscosity modifier added in the mixing water and the other containing a solution of the same admixture used to pre-wet fine lightweight aggregate. Additionally, the fly ash mixtures exhibited a significantly higher carbonation coefficient in both exposures than their corresponding OPC concretes.

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“…Neves et al [13] studied the influence of age and environmental conditions on the ratio of accelerated and natural carbonation coefficients and concluded that only the environmental conditions have an influence on the ratio. Authors [13] have suggested that when CO2 concentrations differ slightly from 5% in accelerated carbonation resistance testing, a correction of the acceleration factor (slope of accelerated and natural carbonation coefficients) by the square root of accelerated carbon dioxide concentrations ratio is used.…”

Section: Introductionmentioning

confidence: 99%

“…Authors [13] have suggested that when CO2 concentrations differ slightly from 5% in accelerated carbonation resistance testing, a correction of the acceleration factor (slope of accelerated and natural carbonation coefficients) by the square root of accelerated carbon dioxide concentrations ratio is used. Cheng, et al [14] has conducted a study on the depth of carbonation for accelerated carbonated concrete and found that the pH values using phenolphthalein indicator are generally 9 and 7.5 for 50% and 100% degree of carbonation, respectively.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Accelerated Carbonation on Properties of Concrete

Hussain

Bhunia

Singh

2016

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Abstract. This study deals with the effect of carbonation on the mechanical properties such as compressive strength, flexural strength and durability like depth of carbonation and volume of permeable voids of the concrete cast using ordinary Portland cement over a time period of up to 1 year. To study the behavior of carbonation front of concrete in presence of varying water content, water binder ratios of 0.35, 0.50 and 0.65 are chosen. It is observed that the volume of permeable voids of concrete has decreased, with an increase in compressive strength, flexural strength, and depth of carbonation as the number of days of exposure of concrete specimen to high carbon dioxide increased. Keywords:Compressive strength, depth of carbonation, flexural strength and volume of voids.

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Field assessment of the relationship between natural and accelerated concrete carbonation resistance

Cited by 107 publications

References 24 publications

Influence of cement type on carbonation of concrete mixtures

Influence of cement type on carbonation of concrete mixtures

Accelerated and natural carbonation of concretes with internal curing and shrinkage/viscosity modifiers

An Experimental Investigation of Accelerated Carbonation on Properties of Concrete

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