TY - JOUR
T1 - Preparation and carbonation hardening of low calcium CO2 sequestration materials from waste concrete powder and calcium carbide slag
AU - Liu, Songhui
AU - Rong, Pengjie
AU - Zhang, Cheng
AU - Lu, Jian Xin
AU - Guan, Xuemao
AU - Shi, Caijun
AU - Zhu, Jianping
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China ( 52108208 , U1905216 ), the China building materials federation ( 20221JBGS03-11 ), the Science and technology project of Henan Province ( 211110231400 , 212102310559 , 212102310564 , 222300420167 , 22A430022 ), the Opening Project of State Key Laboratory of Green Building Materials ( 2021GBM06 ), the foundation of Henan Polytechnic University ( J2023-6 , T2023-5 , B2020-11 ) and the Henan Outstanding Foreign Scientists' Workroom ( GZS2021003 ).
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/8
Y1 - 2023/8
N2 - A series of new low calcium CO2 sequestration cementitious materials (LCC) with different Ca/Si ratios were prepared by sintering waste concrete fine powder (WCP) and calcium carbide slag (CCS) at different ratios. Their carbonation reaction activity, carbonation hardening properties, phase assemblages, and microstructure were systematically characterized. The results showed that when the WCP: CCS ratio was 70:30, the compressive strength of LCC reached 38 MPa after carbonation for 24h. With the decrease in the WCP: CCS ratio, the carbonation activity of LCC increased significantly. When the WCP: CCS ratio was 45:55, the compressive strength was increased to 109 MPa. Microstructure tests showed that the minerals of LCC gradually changed from CS and C2AS to C3S2 and C2S. After carbonation, unreacted clinker particles, crystalline CaCO3 and highly polymerized silica formed a dense microstructure, and the impurities of Mg element in the LCC triggered the formation of aragonite.
AB - A series of new low calcium CO2 sequestration cementitious materials (LCC) with different Ca/Si ratios were prepared by sintering waste concrete fine powder (WCP) and calcium carbide slag (CCS) at different ratios. Their carbonation reaction activity, carbonation hardening properties, phase assemblages, and microstructure were systematically characterized. The results showed that when the WCP: CCS ratio was 70:30, the compressive strength of LCC reached 38 MPa after carbonation for 24h. With the decrease in the WCP: CCS ratio, the carbonation activity of LCC increased significantly. When the WCP: CCS ratio was 45:55, the compressive strength was increased to 109 MPa. Microstructure tests showed that the minerals of LCC gradually changed from CS and C2AS to C3S2 and C2S. After carbonation, unreacted clinker particles, crystalline CaCO3 and highly polymerized silica formed a dense microstructure, and the impurities of Mg element in the LCC triggered the formation of aragonite.
KW - Calcium carbide slag
KW - Carbonation
KW - CO sequestration
KW - Low calcium cementitious material
KW - Waste concrete powder
UR - http://www.scopus.com/inward/record.url?scp=85160281136&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2023.105151
DO - 10.1016/j.cemconcomp.2023.105151
M3 - Journal article
AN - SCOPUS:85160281136
SN - 0958-9465
VL - 141
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 105151
ER -