Assessing CO2 uptake of CO2-cured cement mortar through theoretical modeling and experimental validation

Lixi LIU, Yilun LIU, Buyun SU, Chao LIU, Xi CHEN

Research output: Journal PublicationsJournal Article (refereed)peer-review

1 Citation (Scopus)

Abstract

CO2 curing of cement-based materials is considered a promising carbon–neutral technology for large-scale storage of CO2, and CO2 uptake is the key parameter for evaluating CO2 storage capacity. This study assessed the CO2 uptake of cement mortar subjected to flue gas curing through theoretical modeling and experimental validation. It is found that the CO2 uptake for the high-concentration group is higher at early stages but becomes the same after sufficient curing, as the higher CO2 concentration accelerates the diffusion process but has little effect on the carbonation process. Meanwhile, although the initial CO2 uptake for the smaller specimens is larger, the difference gradually decreases with curing time after overall curing. Achieving overall curing is an effective way to ensure high carbonation rate and CO2 uptake. The CO2 uptake at overall curing increases with increasing specimen size or decreasing CO2 concentration. For fixed-depth CO2 curing, the CO2 uptake decreases significantly with increasing specimen size, while the curing time and carbonation degree change little. The findings of the present work will be beneficial to improve the CO2 storage capacity of cement-based materials and push forward the application of CO2 capture, utilization and storage (CCUS) technology in the construction industry. © 2023 Elsevier Ltd
Original languageEnglish
Article number131393
JournalConstruction and Building Materials
Volume383
Early online date14 Apr 2023
DOIs
Publication statusPublished - 20 Jun 2023
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported by the National Natural Science Foundation of China (Grant No. 12102289). The financial contribution is gratefully acknowledged.

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • CO curing
  • CO uptake
  • Flue gas
  • Theoretical modeling

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