A double-cylinder model incorporating confinement effects for the analysis of corrosion-caused cover cracking in reinforced concrete structures

Su, R.K.L.; Zhang, Yanlong

doi:10.1016/j.corsci.2015.07.009

Cited by 46 publications

(22 citation statements)

References 45 publications

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“…To simulate the effect of concrete cracking due to the corrosion of reinforcement, a doublecylinder model [13] developed by the authors was employed. This model features: (1) incorporating residual tensile stress in cracked concrete, (2) considering the stiffness contribution from both reinforcement and corrosion products (i.e.…”

Section: The Analytical Modelmentioning

confidence: 99%

“…2c, with a cylinder radius equal to D/2+d 0 +c b,1 (c b,1 ≥c b,0 ), which is larger than or equal to that of the first model, is introduced. The required radius of the cylinder has been obtained by calibrating the computed time to cover cracking with the available experimental results [13].…”

Section: The Analytical Modelmentioning

confidence: 99%

“…In this study, critical expansive pressure and CCT capacity of corroded reinforcement concrete are determined by a newly developed double-cylinder model [13]. A generic relationship between CCT capacity and concrete cover in a bilinear form is proposed for the first time.…”

Section: Introductionmentioning

confidence: 99%

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Concrete cover tensile capacity of corroded reinforced concrete

Zhang

2017

Construction and Building Materials

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In this paper, the concrete cover tensile (CCT) capacity of cracked concrete caused by reinforcement corrosion is investigated. A newly developed double-cylinder model with the consideration of concrete confinement effects is used to evaluate the critical expansive pressure of the corrosion products necessary to cause unstable cover crack propagation in corroded reinforced concrete. After considering the critical pressures associated with wide ranges of tensile capacities of concrete, reinforcement diameters and cover thicknesses, an empirical critical expansion pressure function is determined by the least squares method. The CCT capacity of cracked concrete is obtained by considering the equilibrium of expansive pressure and concrete resistant tensile force at the limiting stage. A generic relationship between CCT capacity and concrete cover in a bilinear form, which is suitable for the design, analysis and modeling of the problems related to reinforcement bar corrosion induced and other internal expansion-caused cover cracking, is proposed for the first time. Parametric studies are conducted to investigate the effects of the tensile strength of concrete and cover thickness on the critical expansive pressure and CCT capacity.

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Section: The Analytical Modelmentioning

confidence: 99%

Section: The Analytical Modelmentioning

confidence: 99%

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Concrete cover tensile capacity of corroded reinforced concrete

Zhang

2017

Construction and Building Materials

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“…The formation of cracks provides a path through which the aggressive agents from the environment can easily penetrate and reach the reinforcement, accelerating the corrosion process. In this stage the corrosion products begin to fill the cracks, which then causes crack opening and propagation, spalling and delamination of the cover [10,11]. Figure 1 shows the three main stages of the corrosion process.…”

Section: Introductionmentioning

confidence: 99%

“…The aforementioned SEM and EDS were used to examine the penetration of the rust corrosion products found in the concrete. Lastly, the paper uses an analytical model based on the thick-walled cylinder approach [11] to reproduce the experimental results. The crack width is predicted by using a combination of wavelength dispersive spectroscopy along an analytical line that covers the interface and the radial displacement assessed by the gauges.…”

Section: Introductionmentioning

confidence: 99%

Influence of Pore Networking and Electric Current Density on the Crack Pattern in Reinforced Concrete Test Due to Pressure Rust Layer at Early Ages of an Accelerated Corrosion Test

Bazán

Reyes

Gálvez

2019

Preprint

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Research on early stages of corrosion of steel bars, together with the formation and development of cracks induced in the surrounding concrete and caused by chloride penetration, is relevant in improving the durability of reinforced concrete structures. This paper uses integration of the analytical models examined in the published literature, combined with experimental research in corrosion induced at the concrete/steel interface, in estimating the time-to-crack initiation of reinforced concrete subjected to corrosion. This work studies the influence of the porous network and electric current density on the cracking process at early ages. The experimental campaign was performed by using an accelerated corrosion test on a conventional concrete (CC) and a concrete with silica fume (SFC) by submitting them to a current density of 50μA/cm2 and 100μA/cm2. Examination performed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) provided both qualitative and quantitative information on the penetration of the rust layer in the surrounding concrete porous network. Strain gauges were used to measure corrosion-induced deformations between steel and concrete matrices, as well as the formation of corrosion-induced cracks. A good correlation between the rate of penetration of the rust products in the surrounding pores  and the delay of the cracking pressure in concrete was observed from the experimental results. This phenomenon is incorporated into the analytical model by using a reduction factor, which mainly depends on the pore size of the concrete. The crack width obtained exhibited a significant dependency on electric current density at the beginning of the test, depending mainly on the pore size of the concrete later.

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Infrared thermography detection of delamination in bottom of concrete bridge decks

Raja

Miramini

Duffield

et al. 2021

Structural Contr & Hlth

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Infrared thermography (IRT) has been widely used in detecting the subsurface delamination of bridge deck. However, IRT inspection on delamination zones of the bridge deck which have limited exposure to direct solar radiation (e.g., the bottom surface of the bridge deck) is rather challenging due to the relatively low thermal contrast (ΔT) development in these zones. Therefore, the purpose of this study is to conduct a series of experimental studies in conjunction with numerical modeling for investigating the effectiveness of IRT in delamination detection of bridge deck components which are normally not exposed to direct solar radiation. Specially, the effects of different environmental conditions, thickness of bridge deck, and defect characteristics on the absolute thermal contrast (ΔT) development were systematically investigated. The results show that IRT can effectively detect the subsurface delamination of concrete bridge deck located in regions that are not exposed to the direct solar radiation. In addition, the development of detectable thermal contrast (>0.5 C) is much dependent on the rate of change in ambient temperature with a suitable detection period between 8 am and 4 pm. Furthermore, it shows that the value of ΔT increases with the increase of bridge deck thickness and delamination size.

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A double-cylinder model incorporating confinement effects for the analysis of corrosion-caused cover cracking in reinforced concrete structures

Cited by 46 publications

References 45 publications

Concrete cover tensile capacity of corroded reinforced concrete

Concrete cover tensile capacity of corroded reinforced concrete

Influence of Pore Networking and Electric Current Density on the Crack Pattern in Reinforced Concrete Test Due to Pressure Rust Layer at Early Ages of an Accelerated Corrosion Test

Infrared thermography detection of delamination in bottom of concrete bridge decks

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