Three-fold benefits of using CO₂ to cure seawater sea sand concrete
METADATA ONLY
Loading...
Author / Producer
Date
2023-10-19
Publication Type
Journal Article
ETH Bibliography
yes
Citations
Altmetric
METADATA ONLY
Data
Rights / License
Abstract
Excessive CO2 curing of concrete may significantly increase the risk of steel corrosion, which limits the application of this technology in reinforced concrete. Considering the substantial potential advantages of seawater sea sand concrete (SWSSC) structures reinforced by fiber reinforced polymer (FRP) bars in coastal infrastructure, FRP-SWSSC is proposed to capture CO2 by means of carbonation curing in this study. The effects of long-term CO2 curing on the compressive strength, pore structure, interfacial transition zone, CO2 uptake and pH of SWSSC were examined. It is found that CO2 curing can achieve an increase of approximately 25% in both 28-d and 56-d compressive strengths of SWSSC. Additionally, the porosity experiences a reduction of approximately 3%. The increased carbonation depth and higher CO2 uptake in CO2-cured SWSSC lead to significantly greater CO2 storage. Even after 28 days of additional water curing, the pH of CO2-cured SWSSC remains below 9, thus preventing any damage caused by the high pH environment to the mechanical properties and microstructure of embedded FRP bars. Therefore, CO2 curing of FRP-SWSSC offers three-fold great benefits: (1) improved SWSSC performance, (2) increased CO2 storage amount, and (3) reduced adverse effects of high alkaline concrete pore solution on embedded FRP bars.
Permanent link
Publication status
published
Editor
Book title
Journal / series
Volume
401
Pages / Article No.
132868
Publisher
Elsevier
Event
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Civil engineering; Climate change; CO₂ curing; Seawater sea sand concrete; Fiber reinforced polymer bars; Three-fold benefits
Organisational unit
09593 - Angst, Ueli / Angst, Ueli