Abstract
Carbonation curing of cement-based materials is an important pathway for CO 2 utilization and sequestration. Most previous studies focused on pure CO 2 carbonation curing. In this work, we demonstrate superior CO 2 uptake and enhanced compressive strength with flue gas (20% CO 2 concentration) carbonation curing. The flue gas carbonation rate is smaller at the beginning of curing, but the CO 2 uptake and compressive strength are larger than that of pure CO 2 curing at 12 h carbonation. Moreover, the growth rate of the post hydration strength is inversely proportional to the CO 2 uptake, but under proper combination of carbonation and hydration curing, the 28d strength of the flue gas carbonated specimen can be higher than that of the hydration specimen. The carbonation curing mechanism for the flue gas and pure CO 2 is discussed from a microscopic perspective. The higher carbonation capacity of lower concentration CO 2 in cement carbonation curing may inspire new pathways in carbonation management.
| Original language | English |
|---|---|
| Article number | 128364 |
| Journal | Construction and Building Materials |
| Volume | 346 |
| DOIs | |
| Publication status | Published - 5 Sept 2022 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2022 Elsevier Ltd
Funding
This work was supported by the Key Science and Technology Innovation Engineering Project of Shandong Province of China (2019JZZY010301). X.C. acknowledges support from the Earth Engineering Center and Center for Advanced Materials for Energy and Environment at Columbia University, United States.
Keywords
- Carbonation curing
- Carbonation curing mechanism
- Cement-based materials
- Flue gas CO