Effect of cracking and healing on chloride transport in OPC concrete

Jacobsen, Stefan; Marchand, J.; Boisvert, Luc

doi:10.1016/0008-8846(96)00072-5

Cited by 165 publications

(96 citation statements)

References 8 publications

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“…Therefore, the findings of this study are not expected to be substantially influenced by this approximation since the effect of the added microcracks would be far greater than that of the ITZ. Indeed, the order of magnitude increase in transport property simulated in this study is well within the range of those reported in the literature [Jacobsen et al 1996;Djerbi et al, 2008;Wong et al, 2009;Kamali-Bernard and Bernard, 2009;Wu et al, 2015] Ideally our simulated results would be compared with experimental measurements. However, the availability of such experimental data that are suitable for direct comparison is at best scarce and probably non-existent.…”

Section: Discussionsupporting

confidence: 87%

“…Many previous studies have examined the influence of cracks on mass transport properties of concrete such as the work of Jacobsen et al [1996], Wang et al [1997], Gerald et al [1997,2000], Aldea et al [1999], Kamali-Bernard and Bernard [2009], Picandet et al [2009], Grassl et al [2010], Jang et al [2011], Akhavan et al [2012] and Djerbi et al [2008Djerbi et al [ , 2013. However, the majority of the available studies relate to large (> 0.1 mm) traversing cracks that go through the entire thickness of the sample.…”

Section: Introductionmentioning

confidence: 99%

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Simulating the effect of microcracks on the diffusivity and permeability of concrete using a three-dimensional model

Abyaneh

Wong

Buenfeld

2016

Computational Materials Science

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Concrete inevitably contains microcracks, but their significance on transport properties and long-term durability is not well established. This is because of difficulties in isolating and evaluating the effect of microcracks whether by laboratory experiments or computer simulations, owing to their complex heterogeneous nature. In this paper, a three-dimensional numerical approach to simulate mass transport properties of concrete containing microcracks is presented. The approach is based on finite-element method and adopts aligned meshing to improve computational efficiency. The mesostructure of concrete is represented by aggregate particles that are surface meshed by triangulation and porous cement paste matrix that are discretised with tetrahedral elements. Microcracks are incorporated as interface elements at the aggregate-paste interface or at the cement paste matrix spanning neighbouring aggregate particles. The main advantage of this approach is that the smallest microcracks can be simulated independent of the discretisation size. The model was first validated by comparing the simulations to available analytical solutions. Then, the diffusivity and permeability of a range of concretes containing different amounts of microcracking with increasing complexities were simulated. The results are analysed and discussed in terms of the effect of microcrack type (bond, matrix), volume fraction, width, specific surface area and degree of percolation on transport properties.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Simulating the effect of microcracks on the diffusivity and permeability of concrete using a three-dimensional model

Abyaneh

Wong

Buenfeld

2016

Computational Materials Science

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“…And 409 recently, a similar crack width magnitude order was also observed by using the SEM technology 410 (Yang et al 2006). Therefore, in this study, the width of FTC-induced cracks will be determined 411 based on experimental data obtained by Jacobsen et al (1996). 412 In addition to the crack width, observation with SEM reveals that after freeze-thaw exposure, 413 cracks mostly occur in the interface between cement paste and aggregate (Jacobsen et al 1995;414 1996; Yang et al 2006).…”

mentioning

confidence: 66%

Mesoscale Modeling of Chloride Penetration in Unsaturated Concrete Damaged by Freeze-Thaw Cycling

Wang

Ueda

2014

J. Mater. Civ. Eng.

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For concrete structures exposed to frost attack, cracks or microcracks induced by 5 freeze-thaw cycling can format interconnecting flow paths and allow more water or chloride ions to 6 penetrate into the bulk concrete. It will subsequently facilitate further deterioration of concrete 7 structures and accelerate the corrosion of embedded reinforced steel bars. Moreover, in reality most 8 concrete structures are rarely fully saturated, so that chloride transportation in unsaturated concrete 9 must be studied with respect to the water moving process in order to cover the real existing service 10 conditions. In the current work, a numerical simulation method based on the mesoscale composite

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“…It implys that, narrower cracks heal in the natural marine environment after long-term exposed [9]. In addition, if at the flexural crack to be expected to corrosion firstly appears, the phenomenon a self-healing [10] will occurred due to slow down of chlorides migration generated from the crack filling by the corrosion products [11], and corrosion activity will be decreased [12]. This tends to prove that for longitudinal corrosion cracks, there is no self-healing as in the case of flexural cracks [13].…”

Section: Visual Observationmentioning

confidence: 98%

Prestress Loss and Bending Capacity of Pre-cracked 40 Year-Old PC Beams Exposed to Marine Environment

Dasar

Irmawaty

Hamada

et al. 2016

MATEC Web of Conferences

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Abstract. Six prestressed concrete beams (PC beam) were used for evaluation, consist of four post-tension beams (PC-O) and two pre-tension beams (PC-R). In order to investigate the effect of crack on prestress loss and bending capacity after long-term exposed, prestressed concrete beams were pre-crack and then exposed to marine environment. Experimental work was carried out to evaluate PC beams performance after long-term exposed. In addition, visual observations and load bearing capacity test was carried out. Furthermore, evaluation of prestress loss conducted using three-point loading bending test and the remaining tendon forces in the beam were determined using Crack Re-opening Method. The experimental results revealed that prestress loss was increased due to corrosion of strand/wire which affected by the pre-crack on the prestressed beams. Approximately a prestress loss around 26% and 30% was recorded for post-tension and pre-tension beams respectively.

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Effect of cracking and healing on chloride transport in OPC concrete

Cited by 165 publications

References 8 publications

Simulating the effect of microcracks on the diffusivity and permeability of concrete using a three-dimensional model

Simulating the effect of microcracks on the diffusivity and permeability of concrete using a three-dimensional model

Mesoscale Modeling of Chloride Penetration in Unsaturated Concrete Damaged by Freeze-Thaw Cycling

Prestress Loss and Bending Capacity of Pre-cracked 40 Year-Old PC Beams Exposed to Marine Environment

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