CO2 utilization in concrete

Yixin Shao, Hilal El-Hassan

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)

Abstract

Flue gas carbon dioxide collected from cement kiln can be beneficially utilized in precast concrete production to reduce carbon emission, accelerate early strength, and improve durability of the products. It is accomplished through a carbonation curing of precast products at very early age. This paper summarizes a recent study on optimization of the reaction conditions at which carbon uptake can be maximized, performance of the products is competitive and the process can be implemented in large scale. It is found that initial curing plays a critical role in reaction efficiency. In reference to cement content, carbon uptake in 4-hour carbonation reaches 8 -12% by zero initial curing, 22% by 4 to 8 hours initial curing and 24% by 18 hours initial curing. CO2 curing process can replace steam to reduce embodied energy in concrete products, utilize sufficient amount of carbon dioxide in the vicinity of CO2 sources, and produce the final products with equivalent performance.

Original languageEnglish
Article numbere370
JournalSustainable Construction Materials and Technologies
Volume2013-August
Publication statusPublished - 2013
Externally publishedYes
Event3rd International Conference on Sustainable Construction Materials and Technologies, SCMT 2013 - Kyoto, Japan
Duration: Aug 18 2013Aug 21 2013

Keywords

  • CO2 uptake
  • CO2 utilization
  • Carbonation curing
  • Precast concrete

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Mechanics of Materials
  • Materials Science(all)

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