Effect of crack opening on carbon dioxide penetration in cracked mortar samples

Alahmad, S.; Toumi, Ahmed; Verdier, Jérôme; François, Raoul

doi:10.1617/s11527-008-9402-x

Cited by 50 publications

(49 citation statements)

References 14 publications

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“…The concrete is fully carbonated when the pH value has a pH of 8.0-9.5, as shown in Figure 13. This is in agreement with previous test results [19,44]. The in-situ inspection results indicate that the rebar would begin to corrode when the carbonation depth failed to reach its surface.…”

Section: The Ph Of Concrete Cover For Corrosion Initiationsupporting

confidence: 92%

“…The concrete is fully carbonated when the pH value has a pH of 8.0-9.5, as shown in Figure 13. This is in agreement with previous test results [19,44]. To obtain the critical pH of the fully carbonated zone, the same analysis procedure as that completed for Sample C1 in Section 3.3 was used to analyze other cracked samples with severe corrosion.…”

Section: The Ph Of Concrete Cover For Corrosion Initiationsupporting

confidence: 84%

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Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction

Liu¹,

Niu²,

Li³

et al. 2018

Applied Sciences

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Featured Application: The work presented in this paper is suitable for application to the evaluation of existing reinforced concrete structures in buildings, brides, and tunnels.Abstract: This paper presents an in-situ inspection and experimental investigation on the pore solution pH of concrete cover for the corrosion initiation of rebars under a long-term natural carbonation reaction. A 77-year-old steel mill was inspected, and 35 concrete column cover samples were collected to test the pH of the pore solution and phase compositions layer by layer. The variation in pH and phase compositions of the concrete along the cover depth was studied. The in-situ inspection results indicate that the rebar embedded in concrete had begun to corrode when the carbonation depth was almost less than one-third of the cover depth. The corrosion initiation of rebars embedded in concrete can occur when the pH is between 11.3 and 12.1. The pore solution pH test results and X-ray diffraction (XRD) analysis indicated that there is a semi-carbonated zone between the fully carbonated zone and the rebar. The pH of a fully carbonated zone is in a range of 8.0-9.5, and the pH of a semi-carbonated zone is between 9.5 and 12.1.

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Section: The Ph Of Concrete Cover For Corrosion Initiationsupporting

confidence: 92%

Section: The Ph Of Concrete Cover For Corrosion Initiationsupporting

confidence: 84%

Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction

Liu¹,

Niu²,

Li³

et al. 2018

Applied Sciences

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“…It was shown in [6] that the carbonation of the steel/mortar interface occurs regardless of the pre-crack opening. Therefore, carbon dioxide is able to penetrate through load-induced damage at the steel/mortar interface whatever the crack opening is.…”

Section: Measuring the Steel/mortar Interface Damagementioning

confidence: 99%

“…Despite the big amount of cracking protocols of cementitious materials that could be found in the literature, none of them respond to the above mentioned requirements. For example, The expansive core method [4], [6] leads to a totally damaged steel/mortar interface. Cracking by compression tests [7] as well as freezing/defreezing cracking methods [8] generate diffusive cracks.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical characterisation of load-induced damage in reinforced concrete members

Ghantous¹,

Millard²,

Poyet³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Abstract:The durability of the cooling towers of nuclear power plants (NPP) is an up-to-date issue: some of them can be affected by some cracks. Cracks formation is accompanied by some damages at the steel-concrete interface. These load-induced damages accelerate the diffusion of atmospheric carbon dioxide in the concrete and along the damaged steel-concrete interface. Carbonation at the interface induces steel corrosion which could cause the development of further cracks in the structure, thus, threaten its durability. To understand the effect of cracking, both in terms of corrosion initiation and propagation, an accurate experimental procedure leading to cracks and steel-interface damage representative of those existing on the cooling towers should be found. The objective of this paper is to characterize numerically and experimentally the damage induced at steel/concrete interface by the applied load during three point bending test. This would be determinant parameter for carbonation and then corrosion in RC structures as cooling towers of NPP.

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“…[11] Cracks in concrete act as preferential channels for the penetration of different types of potentially aggressive agents; such as water, chloride ions, and carbon dioxide, which are responsible for the corrosion. [12] Therefore, studies on cracked reinforced concrete for corrosion resistance are essential. A few works were reported on the corrosion behavior of cracked concrete with blended cement system.…”

Section: Introductionmentioning

confidence: 99%

Effect of relative levels of mineral admixtures on corrosion resistance of cracked ternary cement blend concrete

Mala

Mullick

Jain

et al. 2013

Journal of Sustainable Cement-Based Materials

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2014) Effect of relative levels of mineral admixtures on corrosion resistance of cracked ternary cement blend concrete, Journal of Sustainable Cement-Based Materials, 3:1, 24-46, In recent years, emphasis has shifted from using high strength material to highly durable material, to fulfill the demands of sustainable construction. Concrete made with ternary blend of ordinary Portland cement (OPC), silica fume (SF), and fly ash (FA) is a judicious choice before the construction industry for obtaining highly durable concrete. This paper reports the effect of replacement of OPC by FA (20, 30, 40, and 50% replacement of OPC) and/or SF (7 and 10%) on the mechanical and durability properties at w/ b ratio of 0.3 and 0.4. The influence of crack and crack width on half-cell potential (HCP) measurement, conducted on uncracked and cracked specimens, was studied, which showed that ternary cement blend concrete was superior to OPC concrete even in cracked condition. As crack width increases, the HCP readings tend to be more negative, indicating higher probability of corrosion activity.

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Effect of crack opening on carbon dioxide penetration in cracked mortar samples

Cited by 50 publications

References 14 publications

Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction

Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction

Experimental and numerical characterisation of load-induced damage in reinforced concrete members

Effect of relative levels of mineral admixtures on corrosion resistance of cracked ternary cement blend concrete

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