期刊
BUILDINGS
卷 12, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/buildings12020107
关键词
chloride diffusion; superficial chloride; non-constant diffusivity; convection area; concrete irregularities
资金
- European Regional Development Fund (ERDF) through INTERREG Atlantic Area Program [EAPA_826/2018]
The attack of chloride ions is a crucial factor affecting the durability of reinforced concrete. Traditional research methods have limitations in estimating chloride concentration and structural lifetime accurately. This paper proposes a multifactorial and multiphase model that considers multiple factors and incorporates time in the modeling.
The attack of chloride ions is one of the most important factors affecting reinforced concrete (RC) durability. Chloride ingress into concrete is usually studied by assuming constant diffusivity and constant surface chloride concentration. However, these two approximations could badly estimate the chloride concentration in RC structures and then the lifetime assessment. Several factors influence the chloride concentration and ingress mechanisms in the convection area. In this paper, a new multifactorial and multiphase model to account for some effects on chloride surface concentrations in the convection zone is proposed. 136 values have been collected to identify the position and the chloride concentration in the border between the diffusion and convection zones. In addition, a time-dependent multifactorial diffusivity is considered. Diffusivity, which is the key parameter of the mechanical diffusion accounts in this paper for the water/cement ratio, chloride binding, temperature, concrete age, internal humidity, concrete deformation, and damage. The surface chloride model considers environment humidity, temperature, superficial concrete irregularities, and convection area of concrete. Advanced numerical solutions have been carried out to consider space and time dependencies in the model. Results show that the error function-based solutions could underestimate the chloride concentration C for periods < 10 years and for concrete depths > 4.0 cm in comparison with the proposed model.
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