TY - JOUR
T1 - Superior CO2 uptake and enhanced compressive strength for carbonation curing of cement-based materials via flue gas
AU - LIU, Lixi
AU - LIU, Yilun
AU - TIAN, Xiaogeng
AU - CHEN, Xi
PY - 2022/9/5
Y1 - 2022/9/5
N2 - Carbonation curing of cement-based materials is an important pathway for CO2 utilization and sequestration. Most previous studies focused on pure CO2 carbonation curing. In this work, we demonstrate superior CO2 uptake and enhanced compressive strength with flue gas (20% CO2 concentration) carbonation curing. The flue gas carbonation rate is smaller at the beginning of curing, but the CO2 uptake and compressive strength are larger than that of pure CO2 curing at 12 h carbonation. Moreover, the growth rate of the post hydration strength is inversely proportional to the CO2 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 CO2 is discussed from a microscopic perspective. The higher carbonation capacity of lower concentration CO2 in cement carbonation curing may inspire new pathways in carbonation management. © 2022 Elsevier Ltd
AB - Carbonation curing of cement-based materials is an important pathway for CO2 utilization and sequestration. Most previous studies focused on pure CO2 carbonation curing. In this work, we demonstrate superior CO2 uptake and enhanced compressive strength with flue gas (20% CO2 concentration) carbonation curing. The flue gas carbonation rate is smaller at the beginning of curing, but the CO2 uptake and compressive strength are larger than that of pure CO2 curing at 12 h carbonation. Moreover, the growth rate of the post hydration strength is inversely proportional to the CO2 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 CO2 is discussed from a microscopic perspective. The higher carbonation capacity of lower concentration CO2 in cement carbonation curing may inspire new pathways in carbonation management. © 2022 Elsevier Ltd
KW - Carbonation curing
KW - Carbonation curing mechanism
KW - Cement-based materials
KW - Flue gas CO2
UR - http://www.scopus.com/inward/record.url?scp=85134610748&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2022.128364
DO - 10.1016/j.conbuildmat.2022.128364
M3 - Journal Article (refereed)
SN - 0950-0618
VL - 346
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 128364
ER -