Chloride diffusion assessment in RC structures considering the stress-strain state effects and crack width influences

Zacchei, Enrico; Nogueira, Caio Gorla

doi:10.1016/j.conbuildmat.2018.12.166

Cited by 31 publications

(18 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After that, the chloride concentration of concrete powder sample was also measured in compliance with the standard JTS/T 236-2019. The stress level μ can be used to describe the distribution of chloride ion diffusion caused by sustained stress [ 20 , 21 , 22 , 23 , 24 ].

where f c is the measured compressive strength of concrete.…”

Section: Experimental Programmentioning

confidence: 99%

Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress

et al. 2020

View full text Add to dashboard Cite

The existence of axial and lateral compressive stress affect the diffusion of chloride ions in concrete will lead to the performance degradation of concrete structure. This paper experimentally studied the chloride diffusivity properties of uniaxial and biaxial sustained compressive stress under one-dimensional chloride solution erosion. The influence of different sustained compressive stress states on chloride ion diffusivity is evaluated by testing chloride concentration in concrete. The experiment results show that the existence of sustained compressive stress does not always inhibit the diffusion of chloride ions in concrete, and the numerical value of sustained compressive stress level can affect the diffusion law of chloride ions in concrete. It is found that the chloride concentration decreases most when the lateral compressive stress level is close to 0.15 times the compressive strength of concrete. In addition, the sustained compressive stress has a significant effect on chloride ion diffusion of concrete with high water/cement ratio. Then, the chloride diffusion coefficient model under uniaxial and biaxial sustained compressive stress is established based on the apparent chloride diffusion coefficient. Finally, the results demonstrate that the chloride diffusion coefficient model is reasonable and feasible by comparing the experimental data in the opening literature with the calculated values from the developed model.

show abstract

where f c is the measured compressive strength of concrete.…”

Section: Experimental Programmentioning

confidence: 99%

Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Considering the initial and boundary conditions (Equation ( 2)) introduced by Collepardi [23,24], Equation (1) can be transformed into Equation (3), which provides an 3 of 14 analytical solution to describe the diffusion process. The equation considers the mechanical and physical aspects [25]:…”

Section: Basic Model For Service Life Predictionmentioning

confidence: 99%

“…where C is the chloride concentration (kg/m 3 ), t is the exposure period in the chloride environment (s), x is the distance from the surface (mm), D is the chloride diffusion coefficient (m 2 /s), C 0 is the initial chloride concentration existing in concrete (kg/m 3 ), C s is the chloride concentration on the surface of the structure (kg/m 3 ) and erf(*) is the Gaussian error function that is presented by Equation ( 4) which describes the evolution of the chloride diffusion front in the direction x at a time t [18,25].…”

Section: Basic Model For Service Life Predictionmentioning

confidence: 99%

“…In addition to its effect on the activation energy, temperature simultaneously influences the concentration of free chloride ions which can be converted from bound ions. Free chloride ions are mainly considered to be involved in corrosion instead of bound chloride [10,17,25,28]. The relationship among the total (C t ), bound (C b ) and free (C f ) chloride concentrations in the concrete medium can be expressed as follows [29,30]:…”

Section: Effects Of Temperaturementioning

confidence: 99%

See 1 more Smart Citation

Service Life Prediction and Lateral Bearing Capacity Analysis of Piles Considering Coupled Corrosion-Temperature Deterioration Processes

Chen

Shao

et al. 2021

JMSE

View full text Add to dashboard Cite

High temperatures can enhance the chloride diffusion coefficient and this poses a threat to reinforced concrete (RC) piles. This study intends to propose predictive models that can evaluate the service life and lateral bearing behaviour of reinforced concrete piles subjected to marine environments and varying temperatures. The models show that temperature can accelerate the diffusion rate of chloride and increase the concentration of free chloride in concrete. The distribution law of chloride concentration is obtained by considering the ageing effect as well. Deterministic and probabilistic models are proposed to assess the time to corrosion initiation and propagation. The stiffness degradation coefficient is introduced in the analysis of the lateral bearing capacity of RC piles. The results show that high temperature can decrease the service life of piles and the life spans obtained from deterministic and probabilistic methods are similar; however, the predictions of the latter are more conservative. Temperature can enhance the current density and boost corrosion products, which leads to pile cracking. The rust appearing on the steel surface would make the stiffness degradation coefficient drop sharply. The lateral bearing capacity analysis is conducted from the perspectives of shear force, displacement and bearing moment of the piles.

show abstract

“…Seismic hazard Poisson [49]. Bayesian [78] Probability of occurrence Corrosion Diffusion [79]. Reliability [70] Probability of failure Figure 2 shows the inter-combinations among the four sub-systems of the concrete arch-dams.…”

Section: Hazard Approach Scenariosmentioning

confidence: 99%

Reviewing Arch-Dams’ Building Risk Reduction Through a Sustainability–Safety Management Approach

Zacchei

Molina

2020

Sustainability

Self Cite

View full text Add to dashboard Cite

The importance of dams is rapidly increasing due to the impact of climate change on increasing hydrological process variability and on water planning and management need. This study tackles a review for the concrete arch-dams’ design process, from a dual sustainability/safety management approach. Sustainability is evaluated through a design optimization for dams´ stability and deformation analysis; safety is directly related to the reduction and consequences of failure risk. For that, several scenarios about stability and deformation, identifying desirable and undesirable actions, were estimated. More than 100 specific parameters regarding dam-reservoir-foundation-sediments system and their interactions have been collected. Also, a summary of mathematical modelling was made, and more than 100 references were summarized. The following consecutive steps, required to design engineering (why act?), maintenance (when to act) and operations activities (how to act), were evaluated: individuation of hazards, definition of failure potential and estimation of consequences (harm to people, assets and environment). Results are shown in terms of calculated data and relations: the area to model the dam–foundation interaction is around 3.0 Hd2, the system-damping ratio and vibration period is 8.5% and 0.39 s. Also, maximum elastic and elasto-plastic displacements are ~0.10–0.20 m. The failure probability for stability is 34%, whereas for deformation it is 29%.

show abstract

Chloride diffusion assessment in RC structures considering the stress-strain state effects and crack width influences

Cited by 31 publications

References 43 publications

Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress

Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress

Service Life Prediction and Lateral Bearing Capacity Analysis of Piles Considering Coupled Corrosion-Temperature Deterioration Processes

Reviewing Arch-Dams’ Building Risk Reduction Through a Sustainability–Safety Management Approach

Contact Info

Product

Resources

About