Service life of reinforced structural lightweight aggregate concrete under chloride-induced corrosion

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• 作者：Sofia Real ; José Alexandre Bogas ; Beatriz Ferrer
• 关键词：Lightweight aggregate concrete ; Service life prediction ; Chloride migration ; Fly ash ; Silica fume ; Lime filler
• 刊名：Materials and Structures
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：50
• 期：2
• 全文大小：813 KB
• 刊物类别：Engineering
• 刊物主题：Structural Mechanics
  Theoretical and Applied Mechanics
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  Civil Engineering
  Building Materials
  
• 出版者：Springer Netherlands
• ISSN：1871-6873
• 卷排序：50

文摘

Knowledge of structural lightweight aggregate concrete (SLWAC) durability is still limited, but its potential durability is demonstrated by its good performance in existing structures. This paper focuses on chloride-induced corrosion of the reinforcement in SLWAC, which is one of the most frequent and serious causes of concrete deterioration. Based on a previous comprehensive experimental work, this study aims to predict the chloride-induced corrosion service life of SLWAC produced with different types of lightweight aggregate and types of binder. The service life prediction is based on a performance-based model suggested in the specification E465 (Concrete. Methodology for estimating the concrete performance properties allowing to comply with the design working life of the reinforced or prestressed concrete structures under the environmental exposures XC and XS. LNEC specification, Portugal 2005), considering a safety factor method. New abacuses are defined to predict the service life of uncracked SLWAC as a function of their chloride diffusion coefficient and concrete cover. Finally, limiting values of concrete composition are recommended for the most common uncracked normal weight concrete and SLWAC, for an intended service life of at least 50 years. This deemed to satisfy approach is extended for concrete with fly ash, silica fume and lime filler.