Carbonation of concrete: the role of CO2 concentration, relative humidity and CO2 buffer capacity

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• 作者：Andreas Leemann ; Fabrizio Moro
• 刊名：Materials and Structures
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：50
• 期：1
• 全文大小：648 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

In this study, the effect of CO₂ concentration and ambient relative humidity (RH) on accelerated and natural carbonation of 18 concrete mixtures produced with nine different cement types is investigated. Increasing the CO₂ concentration from 0.045 to 1 and 4 % at 57 % RH does not alter the relative carbonation resistance between the concrete mixtures. The increase of RH from 57 to 70 and 80 % RH at 4 % CO₂ shows a water-to-cement ratio and cement-specific effect that affects the relative carbonation resistance between the concrete mixtures. The carbonation resistance at 4 % CO₂ and 57 % RH allows assessing the carbonation resistance of concrete in sheltered and with restrictions in unsheltered outdoor exposure. The carbonation resistance below 70 % RH is mainly governed by the CO₂ buffer capacity. However, in the accelerated tests at 80 % RH and in the unsheltered outdoor exposure capillary condensation is of increased importance.KeywordsCarbonationCO₂ concentrationRelative humidityBlended cementConcrete