Comparative study of probabilistic modeling approaches for chloride ingress in concrete structures with macro‐cracks

Schultheiß, Annika Lidwina; Patel, Ravi A.; Vogel, Michael; Dehn, Frank

doi:10.1002/suco.202200069

Cited by 8 publications

(17 citation statements)

References 43 publications

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“…The width of PSC of concrete influences the long‐term performance due to the degree of penetrability of harmful substances 29 . This highly determines the corrosion of reinforced concrete when chloride and salt content easily penetrate through larger crack widths 67 . Figure 14 reveals the mean and maximum crack widths of concrete specimens that were exposed to the PSC environment from the image processing.…”

Section: Resultsmentioning

confidence: 99%

Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Arulmoly

Konthesingha

Nanayakkara

2022

Structural Concrete

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Manufactured sand (MS) has been started utilizing as an alternative in constructions due to the escalated demand for river sand (RS). The microfine aggregate (MFA) is a salient constituent in manufactured sand, which is a crushed reactive form of parent rocks having particles less than 0.075 mm. This paper presents the effects of varying microfine aggregate levels on bleeding, plastic shrinkage cracking (PSC) and compressive strength of MS made concrete. Two types of MS were utilized: MS from Hornblende‐Gneiss rock (MH) and MS from Charnockite rock (MC) and the MFA level was ranged from 0% to 12% at 3% increments and the reference concrete was prepared with RS alone. With the MFA levels, the bleeding of MS concretes was reduced where, at 0% MFA level the maximum bleeding rates were observed for MC (1.63 kg/m2) and MH (0.84 kg/m2) concretes. PSC results were analyzed from an image processing technique, which revealed an increasing trend of mean and maximum crack widths, crack length and crack area with the MFA levels. At 0% MFA, the mean crack width of MC (0.19 mm) and MH (0.17 mm) concretes manifested marginally similar to RS concrete (0.17 mm). The decreasing bleeding with the MFA levels can be attributed to the increasing severity to PSC. Moreover, the optimum 28 days compressive strength of MC (57.5 MPa) and MH (56.1 MPa) concretes was achieved at 3% MFA level which are higher than RS concrete (51.5 MPa). Consequently, the MFA level should be limited to 3% for better plastic and hardened performance of MS made concrete.

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Section: Resultsmentioning

confidence: 99%

Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Arulmoly

Konthesingha

Nanayakkara

2022

Structural Concrete

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“…It should also be noted that the model herein considered for chloride penetration does not consider cracking in concrete. More information related to different approaches on how to extend chloride ingress equations in cracked concrete is presented, applied, and discussed in reference 36.…”

Section: Long‐term Shear Strength Prediction Considering Corrosion Da...mentioning

confidence: 99%

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Frontera

Cladera

2022

Structural Concrete

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Corrosion of stirrups (generally with small diameters and concrete covers) significantly affects the shear strength of reinforced concrete elements. As shear failures may lead to brittle collapses, hence the need to avoid them during structures' entire service life. The Compression Chord Capacity Model (CCCM), a shear mechanical model, was recently extended to predict the strength of corrosion-damaged beams by identifying the model parameters that could be most affected by steel corrosion. In this paper, the CCCM is combined with two material deterioration models included in the new Spanish Structural Code, and considers carbonation of concrete or chloride ions, to predict long-term shear strength evolution. Finally, a parametric analysis is carried out to explore the effect of the most influential parameters on shear strength degradation according to the used models and depending on different exposure classes.

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“…Here, the resistance of the crack against chloride ingress is neglected. Schultheiß et al [11] conducted a comprehensive comparison between various engineering approaches that can be employed when dealing with cracked concrete. It was concluded, that the prediction result was strongly dependent on the model used.…”

Section: Introductionmentioning

confidence: 99%

“…Several approaches which extend erf-solution to account for cracks when predicting chloride ingress can be found in the literature. In this study, principally we distinguish between such engineering approaches and numerical approaches, which both can be used for service life predictions [11].…”

Section: Introductionmentioning

confidence: 99%

Probabilistic service life prediction of cracked concrete using numerical and engineering models

L. Schultheiß,

Patel,

Dehn

2023

ce papers

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Chloride ingress induced depassivation of reinforcing steel leading to corrosion is a major durability concern for concrete structures. The influence of the presence of cracks commonly occurring in concrete structures on chloride ingress should be accounted to improve the accuracy of service life predictions. This study investigates the depassivation probability of the reinforcement in both cracked and uncracked concrete using both analytical and 1D numerical models. The probabilistic service life prediction is realized using the Monte Carlo simulation to incorporate the uncertainty and variability in the input variables. For uncracked concrete the result of the numerical model agreed well with the fib chloride model. For cracked concrete, the numerical simulation suggests that the optimal engineering approach to account for cracks in a service life analysis is the adaptation of crack depth. Although, the approach could lead to an overestimation of chloride concentration because the 1D numerical simulation did not consider lateral diffusion in cracked concrete.

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Comparative study of probabilistic modeling approaches for chloride ingress in concrete structures with macro‐cracks

Cited by 8 publications

References 43 publications

Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Plastic settlement and hardened state assessments of manufactured sand made concrete for varying microfine levels

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Probabilistic service life prediction of cracked concrete using numerical and engineering models

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