TY - JOUR
T1 - High-performance belite rich eco-cement synthesized from solid wastes
T2 - Raw feed design, sintering temperature optimization, and property analysis
AU - Lyu, Hanxiong
AU - Hao, Lucen
AU - Zhang, Shipeng
AU - Poon, Chi Sun
N1 - Funding Information:
We gratefully acknowledge the financial support of University Grants Committee Research Grants Council (15226022). The equipment supports from the University Research Facility on Chemical and Environmental Analysis (UCEA) at the Hong Kong Polytechnic University is also acknowledged.
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/12
Y1 - 2023/12
N2 - In this study, a high-performance eco-cement with excellent CO2 sequestration capacity was synthesized using municipal solid waste incineration bottom ash and recycled concrete fine. The influence of clinkering temperature on the clinkers was assessed by mechanical properties, mineralogy, and microstructure. Optimal sintering at 1100 °C for 1 hour yielded eco-cement rich in β-C2S (44.9%), demonstrating remarkable carbonation reactivity (CO2 uptake of 12.5%) and compressive strength (1-day strength of 113.7 MPa). The presence of carbonation products, including cubic-shaped calcite and low Ca/Si C-S-H, resulted in a densified microstructure contributing to exceptional strength. Furthermore, the eco-cement exhibited latent hydraulic behavior and recorded a 28-day strength of 136.9 MPa. Varying clinkering temperatures to 1000 °C and 1200 °C promoted the formation of γ-C2S and rankinite, respectively, which generated silica gel during carbonation curing and weakened the overall performance. Leaching assessments confirmed the eco-cement's reasonable merit as an alternative, high-performance, sustainable binder.
AB - In this study, a high-performance eco-cement with excellent CO2 sequestration capacity was synthesized using municipal solid waste incineration bottom ash and recycled concrete fine. The influence of clinkering temperature on the clinkers was assessed by mechanical properties, mineralogy, and microstructure. Optimal sintering at 1100 °C for 1 hour yielded eco-cement rich in β-C2S (44.9%), demonstrating remarkable carbonation reactivity (CO2 uptake of 12.5%) and compressive strength (1-day strength of 113.7 MPa). The presence of carbonation products, including cubic-shaped calcite and low Ca/Si C-S-H, resulted in a densified microstructure contributing to exceptional strength. Furthermore, the eco-cement exhibited latent hydraulic behavior and recorded a 28-day strength of 136.9 MPa. Varying clinkering temperatures to 1000 °C and 1200 °C promoted the formation of γ-C2S and rankinite, respectively, which generated silica gel during carbonation curing and weakened the overall performance. Leaching assessments confirmed the eco-cement's reasonable merit as an alternative, high-performance, sustainable binder.
KW - Carbonation curing
KW - Incineration bottom ash
KW - Mechanical performance
KW - Recycled concrete fine
KW - Sintering temperature
UR - http://www.scopus.com/inward/record.url?scp=85172297544&partnerID=8YFLogxK
U2 - 10.1016/j.resconrec.2023.107211
DO - 10.1016/j.resconrec.2023.107211
M3 - Journal article
AN - SCOPUS:85172297544
SN - 0921-3449
VL - 199
JO - Resources, Conservation and Recycling
JF - Resources, Conservation and Recycling
M1 - 107211
ER -