Effect of Carbonation Mixing on CO₂ Uptake and Strength Gain in Concrete

Abstract Concrete is well known for its capacity to sequester carbon dioxide (CO₂) through carbonation curing. If carbonation mixing can be used to introduce CO₂ during concrete mixing, the process is able to enhance the carbon capture and storage capacity of concrete and makes the technology available to both precast and cast-in-place concretes. This paper studies the effect of carbonation mixing on CO₂ uptake and strength gain of cement paste, which is the key carbon-reactive ingredient in concrete. Three mixing methods were investigated: (1) normal air mixing, (2) carbonation mixing, and (3) hybrid mixing with carbonation mixing first, followed by normal air mixing. Two curing methods, air curing and carbonation curing, were also studied to examine the effect of carbonation mixing on curing. It was found that carbonation mixing could increase the CO₂ uptake but decrease the strength gain. The reduction in strength by carbonation mixing was caused by the formation of carbonate coating on cement particles. The property can be improved if air mixing is introduced right after carbonation mixing.

• Record URL:
  https://doi.org/10.1061/(ASCE)MT.1943-5533.0002031
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08991561
• Supplemental Notes:
  • © 2017 American Society of Civil Engineers.
• Authors:
  • He, Zhen
  • Li, Zhen
  • Shao, Yixin
• Publication Date: 2017-10

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 04017176
• Serial:
  • Journal of Materials in Civil Engineering
  • Volume: 29
  • Issue Number: 10
  • Publisher: American Society of Civil Engineers
  • ISSN: 0899-1561
  • EISSN: 1943-5533
  • Serial URL: http://ascelibrary.org/journal/jmcee7

Subject/Index Terms

• TRT Terms: Carbon dioxide; Carbonation; Cast in place concrete; Concrete curing; Concrete mixing; Precast concrete; Strength of materials
• Subject Areas: Highways; Materials; Operations and Traffic Management; Pavements;

Filing Info

• Accession Number: 01642142
• Record Type: Publication
• Files: TRIS, ASCE
• Created Date: Jul 8 2017 3:02PM