Effects of coarse aggregates on chloride diffusion coefficients of concrete and interfacial transition zone under experimental drying-wetting cycles

Wang, Yuanzhan; Wu, Linjian; Wang, Yuchi; Liu, Chenxi; Li, Qingmei

doi:10.1016/j.conbuildmat.2018.07.049

Cited by 59 publications

(27 citation statements)

References 48 publications

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“…The chloride concentrations first increase and then decrease with increasing depth in the experimental specimens. The aforementioned variation laws of chloride diffusion concentrations are consistent with the conclusions reported by literatures [28,33]. In addition, the convection zone affected by drying-wetting cycles can be clearly observed in Figures 1 and 2.…”

Section: Chloride Concentration Profilessupporting

confidence: 91%

“…In most actual engineering projects, the properties of concrete materials are subject to deterioration and variation, particularly in marine environments. To satisfy economic, mechanical, and reliability requirements, VFCAs are usually approximately 40% within concrete composites [33]. The properties of aggregates are considered an important factor that affects the corrosion resistance and durability of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

“…The properties of aggregates are considered an important factor that affects the corrosion resistance and durability of concrete structures. Wang et al [33] probed the influence of VFCA on chloride ion distribution and diffusion behavior in concrete by means of an indoor drying-wetting cycle experiment. The chloride concentration and chloride diffusivity decreased with increasing VFCA, while the surface chloride concentration was not disturbed by the coarse aggregate.…”

Section: Introductionmentioning

confidence: 99%

“…The results demonstrated that as the proportion of larger aggregates increased in the mixture, the local porosity at the ITZ increased, and the overall durability of concrete decreased. Wang et al [33] elaborated the influence of the MSCA on the chloride diffusion behavior of concrete via an indoor drying-wetting cycle experiment. It was concluded that the chloride diffusion concentration increased with decreasing MSCA, and the surface chloride concentration had nothing to do with the coarse aggregate factor.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of Chloride Concentration Profiles in Concrete by the Consideration of Concrete Material Factors under Marine Tidal Environment

Liu

et al. 2022

JMSE

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The corrosion of reinforcement induced by chloride ions is one of the most significant causes of durability deterioration for reinforced concrete (RC) buildings. The concrete material factors, including the water-to-cement ratio (w/c) of concrete, as well as the content, shape, particle grading, and random distribution of coarse aggregate embedded in mortar, have a marked effect on chloride transport performance within concrete. However, comprehensive consideration for the effects of both w/c and coarse aggregate performances on chloride diffusion characteristics in concrete is scarce, especially regarding the chloride diffusion model of concrete. In this paper, an indoor exposure experiment exploring chloride ions intruding into mortar and concrete specimens with w/c = 0.4, 0.5 and 0.6 was carried out, in order to acquire the chloride diffusion parameters for concrete three-phases composites. Based on the numerical algorithm of random generation and placement of two-dimensional random convex polygon coarse aggregate, mesoscopic numerical models for concrete, considering various coarse aggregate contents as well as grading, were established. Using the numerical simulation method of finite element analysis for chloride transport in cement-based materials, which can replace some of the exposure tests, the influences of w/c, coarse aggregate content and grading on chloride diffusion performance in concrete mesoscopic models were systematically probed. According to the Fick’s second law, a chloride diffusion model by the consideration of w/c, volume fraction of coarse aggregate (VFCA), and maximum size of coarse aggregate (MSCA) was developed to assess the chloride concentration profiles in concrete under arbitrary w/c, coarse aggregate content, and coarse aggregate grading conditions. Certainly, the precision accuracy for this proposed chloride diffusion model was validated. The research results can provide theoretical support for chloride erosion behavior and structural durability assessment of concrete with different mix proportions.

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Section: Chloride Concentration Profilessupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling of Chloride Concentration Profiles in Concrete by the Consideration of Concrete Material Factors under Marine Tidal Environment

Liu

et al. 2022

JMSE

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“…Wu et al (2016) 10 -15 mm 5 -10 mm Paul et al (2016) 10 -15 mm 0 -5 mm Qi et al (2018) 2.5 -7.5 mm N.D. Y. Wang et al (2018) 2 -6 mm N.D. *Concrete was fully immersed throughout testing period without being subjected to drying phase. N.D. -Not determined in the study…”

Section: Literaturementioning

confidence: 99%

Deterioration of marine concrete exposed to wetting-drying action

Ting

Wong

Rahman

et al. 2021

Journal of Cleaner Production

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The adverse effects of hostile marine environment on concrete structure have inevitably resulted in huge economic loss and may contribute to catastrophic failure. Concrete is susceptible to weathering, particularly under wetting-drying action (WDA), although its current state of the art is well established. The diverse characteristics of WDA at different site locations have compromised the reliability of laboratory works. The objective of this study is to review the impact of WDA on concrete and to provide an overview of the research trend, aiming to identify the research gap. Concrete deterioration mechanisms in marine environment in respect of WDA are identified. The influential factors of WDA are analyzed. The physical and mechanical properties and corrosion resistance of concrete exposed to WDA are discussed. WDA aggravates concrete deterioration by hastening intrusion of inimical compounds such as chloride, sulphate and carbon dioxide. Chloride convection zone can be expanded by two to three times to cause a significant concrete cover loss. Physical damage of concrete starts with efflorescence staining, followed by mortar delamination, aggregate detachment and concrete spalling, leading to loss of mechanical properties. The use of mineral admixtures such as fly ash and silica fume improves concrete resistance against corrosion, but its refining effect may lead to over-accumulation of chloride, risking the long-term durability. Limited research works are identified on synergy between physical and chemical deteriorations, validation of simulated experiment, volume expansion, mass change and tensile strength of concrete.

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Peridynamic model for chloride diffusion–reaction in concrete reflecting mesostructure characteristic

Chen,

Gu,

Liu

et al. 2024

Int J Fract

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Effects of coarse aggregates on chloride diffusion coefficients of concrete and interfacial transition zone under experimental drying-wetting cycles

Cited by 59 publications

References 48 publications

Modelling of Chloride Concentration Profiles in Concrete by the Consideration of Concrete Material Factors under Marine Tidal Environment

Modelling of Chloride Concentration Profiles in Concrete by the Consideration of Concrete Material Factors under Marine Tidal Environment

Deterioration of marine concrete exposed to wetting-drying action

Peridynamic model for chloride diffusion–reaction in concrete reflecting mesostructure characteristic

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