Corrosion initiation in cracked fibre reinforced concrete: Influence of crack width, fibre type and loading conditions

Berrocal, Carlos Gil; Löfgren, Ingemar; Lundgren, Karin; Tang, Luping

doi:10.1016/j.corsci.2015.05.021

Cited by 87 publications

(39 citation statements)

References 26 publications

(3 reference statements)

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“…Therefore, fibre reinforcement could reduce the ingress of moisture and other detrimental agents into cracked concrete, e.g. Cl -, and thus potentially delay initiation of reinforcement corrosion in structures exposed to chloride environments [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…Over the past years, several studies investigating the durability of steel fibre reinforced concrete (SFRC) have reported that the addition of steel fibres to the concrete resulted in a significant decrease of the electrical resistivity when measured under alternating current (AC) at different fixed frequencies [13,[20][21][22][23][24]. Contrary to what it could be anticipated, experimental investigations on the influence of steel fibres on corrosion of conventional reinforcement revealed that in addition to a certain delay of corrosion initiation [13,14,25], the corrosion rate of reinforcement, measured using polarisation techniques, was not affected by the incorporation of steel fibres [25][26][27][28]. The latter observation could be explained by the short length and disperse nature of the fibres throughout the concrete matrix, which would require the existence of an unrealistically high electric field to enable current conduction through them, as experimentally shown by Solgaard et al [29].…”

Section: Introductionmentioning

confidence: 99%

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Electrical resistivity measurements in steel fibre reinforced cementitious materials

Berrocal

Hornbostel

Geiker

et al. 2018

Cement and Concrete Composites

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This paper reports results from experiments aimed at better understanding the influence of fibre dosage and fibre geometry on the AC frequency needed to determine the DC resistivity of cementitious materials containing steel fibres. Impedance spectroscopy and DC galvanodynamic measurements were performed on mortar prisms with varying fibre reinforcement to determine the matrix resistivity (related to ionic current within the pore solution) and composite resistivity (accounting for both ionic current and electronic current through the fibres). The results showed that adding steel fibres did not significantly affect the DC nor the AC matrix resistivity of the mortar prisms. However, the steel fibres yielded a drastic reduction of the frequency associated to the AC matrix resistivity from ~1 kHz in plain mortar to ~1 Hz in steel fibre reinforced mortar. These findings revealed the need to adequately adjust the frequency in AC resistivity measurements of steel fibre reinforced cementitious materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical resistivity measurements in steel fibre reinforced cementitious materials

Berrocal

Hornbostel

Geiker

et al. 2018

Cement and Concrete Composites

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“…It should be noted that the denser microstructure of concrete made with silica fume played a major role in the reduction of crack depth. Through the reaction of existing amorphous silica in silica fume with calcium hydroxide, which is a production of cement hydration, secondary gel (C‐S‐H) formed and led to densification of microstructure, reduction of permeability, and the enhancement of compressive strength (see Figure ) . Improvement in the microstructure mitigated crack depth and provided better protection for rebar.…”

Section: Test Results and The Proposed Modelmentioning

confidence: 99%

Modeling of chloride ions penetration in cracked concrete structures exposed to marine environments

Ramezanianpour

Ghoreishian

Ahmadi³

et al. 2018

Structural Concrete

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The degradation caused by corrosion of rebar in concrete structures is one of the most important issues to attract the attention of researchers focused on concrete durability. Penetration of chloride ions into concrete is one of the factors that can contribute to corrosion of rebar and consequently the strength of concrete structures as well as serviceability reduction. In this study, an experimental model was proposed to predict penetration of chloride ions into cracked concrete by performing non‐destructive tests. Tests were performed after 48‐months exposure of all samples to a harsh marine environment. For studying the influence of load‐induced cracks on the rebar corrosion, cracked and uncracked beams were tested. Results of this study demonstrated that by the increment of the crack width, corrosion of reinforcement increased and as a result, the probability of degradation of reinforced concrete beams increased accordingly. Furthermore, by the increment of crack width, their depth also increased which caused enhancement of crack depth on the rebar and easier access of chloride ions to the rebar.

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“…Especially for structures which are exposed to a marine environment or de-icing salts, the presence of cracks provides accelerated pathways for chlorides to enter the concrete matrix [1][2][3][4]. This then leads to an accelerated onset of reinforcement corrosion and further deterioration [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Perpendicular-to-crack chloride ingress in cracked and autonomously healed concrete

et al. 2018

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Cracks in reinforced concrete structures exposed to a marine environment or de-icing salts can cause major durability issues due do accelerated ingress of chloride ions. In this study, the influence of autonomous crack healing by means of encapsulated polyurethane on the chloride ingress perpendicular to cracks was evaluated. This was done quantitatively by determining perpendicular-to-crack chloride profiles by means of profile grinding followed by potentiometric titration and qualitatively through visualization of the chloride penetration front by means of the AgNO3 spray method. The resulting chloride profiles showed that the healing mechanism was able to reduce the chloride concentrations in the direct vicinity of the crack to a large extent and to reduce the perpendicular-to-crack chloride penetration, especially further away from the exposed surface. Visualization of the chloride penetration front showed some variation in crack healing. For some healed samples almost no additional chloride ingress was found compared to uncracked samples, others showed a slightly enhanced ingress at the crack location but less perpendicular-to-crack chloride penetration compared to untreated cracked samples. Generally, the reduced amount of chlorides present in the concrete matrix due to crack healing will enhance the durability and service life of concrete structures.

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Corrosion initiation in cracked fibre reinforced concrete: Influence of crack width, fibre type and loading conditions

Cited by 87 publications

References 26 publications

Electrical resistivity measurements in steel fibre reinforced cementitious materials

Electrical resistivity measurements in steel fibre reinforced cementitious materials

Modeling of chloride ions penetration in cracked concrete structures exposed to marine environments

Perpendicular-to-crack chloride ingress in cracked and autonomously healed concrete

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