TY - JOUR
T1 - Use of CO2 curing to enhance the properties of cold bonded lightweight aggregates (CBLAs) produced with concrete slurry waste (CSW) and fine incineration bottom ash (IBA)
AU - Tang, Pei
AU - Xuan, Dongxing
AU - Cheng, Hiu Wun
AU - Poon, Chi Sun
AU - Tsang, Daniel C.W.
N1 - Funding Information:
The authors wish to thank the Innovation and Technology Support Programme ( ITS-002-17FP ), the Hong Kong Research Grants Council General Research Fund ( PolyU152144/17E and PolyU15223517 ) and the Hong Kong Polytechnic University for funding support. We would also like to thank Dr. Jiangshan Li (The Hong Kong Polytechnic University) for his assistance in sourcing the IBA used in this study.
Publisher Copyright:
© 2019 Elsevier B.V.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/1/5
Y1 - 2020/1/5
N2 - In this study, concrete slurry waste (CSW) obtained from ready-mixed concrete plants was recycled as a fresh cementitious binder and used together with municipal solid waste incineration (MSWI) fine bottom ash (IBA) from waste-to-energy plants to produce cold bonded lightweight aggregates (CBLAs) by using a pelletizing technique. The influence of different curing methods on the properties of the produced CBLAs were experimentally investigated, including moist curing, steam curing, and accelerated CO2 curing at 0.1 bar and flow-through CO2 curing under ambient pressure. The results showed that CBLAs obtained by steam curing at 60 °C had the highest pellet strength, and the CO2 cured samples had the lowest water absorption values. CO2 curing with a pressure of 0.1 bar promoted a better pellet strength. The CO2 curing method can sequestrate 3.5–4.1% (by mass of pellets) of CO2, which can serve as a sustainable CO2 sequestration process to produce CBLAs.
AB - In this study, concrete slurry waste (CSW) obtained from ready-mixed concrete plants was recycled as a fresh cementitious binder and used together with municipal solid waste incineration (MSWI) fine bottom ash (IBA) from waste-to-energy plants to produce cold bonded lightweight aggregates (CBLAs) by using a pelletizing technique. The influence of different curing methods on the properties of the produced CBLAs were experimentally investigated, including moist curing, steam curing, and accelerated CO2 curing at 0.1 bar and flow-through CO2 curing under ambient pressure. The results showed that CBLAs obtained by steam curing at 60 °C had the highest pellet strength, and the CO2 cured samples had the lowest water absorption values. CO2 curing with a pressure of 0.1 bar promoted a better pellet strength. The CO2 curing method can sequestrate 3.5–4.1% (by mass of pellets) of CO2, which can serve as a sustainable CO2 sequestration process to produce CBLAs.
KW - Accelerated CO curing
KW - Cold bonded lightweight aggregates
KW - Integral recycling
KW - Solid wastes
UR - http://www.scopus.com/inward/record.url?scp=85070405532&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.120951
DO - 10.1016/j.jhazmat.2019.120951
M3 - Journal article
AN - SCOPUS:85070405532
VL - 381
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
SN - 0304-3894
M1 - 120951
ER -
