Abstract
Global warming will increase the rate of chloride ingress and the rate of steel corrosion of concrete structures. Furthermore, in coastal (atmospheric marine) zones, sea level rise will reduce the distance of concrete structures from the coast and increase the surface chloride content. This study proposes a probabilistic model for analyzing the effects of global warming and sea level rise on the service life of coastal concrete structures. First, in the corrosion initiation stage, an improved chloride diffusion model is proposed to determine chloride concentration. The Monte Carlo method is employed to calculate the service life in the corrosion initiation stage; Second, in the corrosion propagation stage, a numerical model is proposed to calculate the rate of corrosion, probability of corrosion cracking, and service life. Third, overall service life is determined as the sum of service life in the corrosion initiation and corrosion propagation stages. After considering the impacts of global warming and sea level rise, the analysis results show that for concrete structures having a service life of 50 years, the service life decreases by about 5%.
Highlights
Chloride-induced corrosion causes various negative effects on coastal concrete structures, such as reductions in the cross sectional area of steel rebar, reductions in loading resistance, and concrete cover cracking
The respective studies conducted by Chen and Mahadevan [6] and Vu and Stewart [7] do not consider the effect of global warming
To address the weak points of previous studies [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17], this study considers the effect of sea level rise on service life
Summary
Chloride-induced corrosion causes various negative effects on coastal concrete structures, such as reductions in the cross sectional area of steel rebar, reductions in loading resistance, and concrete cover cracking. Owing to global warming and sea level rise, the rates of chloride ingress and steel corrosion both increase, resulting in a decrease in the service life of the concrete structures. A CO2 emission reduction method at the construction stage was proposed These LCA frameworks [8,9,10,11] do not consider the effect of global warming on service life. A probabilistic model is proposed for evaluating the service life of coastal concrete structures resulting from global warming and sea level rise. The whole service life is determined as the sum of service life in the stages of corrosion initiation and corrosion propagation
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