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Sustainability 2017, 9(1), 157; doi:10.3390/su9010157

Effect of Climate Change on Service Life of High Volume Fly Ash Concrete Subjected to Carbonation—A Korean Case Study

College of Engineering, Department of Architectural Engineering, Kangwon National University, Chuncheon-Si 24341, Korea
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Academic Editor: Yong Han Ahn
Received: 18 December 2016 / Revised: 12 January 2017 / Accepted: 18 January 2017 / Published: 21 January 2017
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Abstract

The increase in CO2 concentrations and global warming will increase the carbonation depth of concrete. Furthermore, temperature rise will increase the rate of corrosion of steel rebar after carbonation. On the other hand, compared with normal concrete, high volume fly ash (HVFA) concrete is more vulnerable to carbonation-induced corrosion. Carbonation durability design with climate change is crucial to the rational use of HVFA concrete. This study presents a probabilistic approach that predicts the service life of HVFA concrete structures subjected to carbonation-induced corrosion resulting from increasing CO2 concentrations and temperatures. First, in the corrosion initiation stage, a hydration-carbonation integration model is used to evaluate the contents of the carbonatable material, porosity, and carbonation depth of HVFA concrete. The Monte Carlo method is adopted to determine the probability of corrosion initiation. Second, in the corrosion propagation stage, an updated model is proposed to evaluate the rate of corrosion, degree of corrosion for cover cracking of concrete, and probability of corrosion cracking. Third, the whole service life is determined considering both corrosion initiation stage and corrosion propagation stage. The analysis results show that climate change creates a significant impact on the service life of durable concrete. View Full-Text
Keywords: high volume fly ash; concrete structures; carbonation; climate change; model high volume fly ash; concrete structures; carbonation; climate change; model
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Park, K.-B.; Wang, X.-Y. Effect of Climate Change on Service Life of High Volume Fly Ash Concrete Subjected to Carbonation—A Korean Case Study. Sustainability 2017, 9, 157.

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