globalchange  > 气候减缓与适应
DOI: 10.1016/j.jcou.2017.11.005
Scopus记录号: 2-s2.0-85035757801
论文题名:
Clinkering-free cementation by fly ash carbonation
作者: Wei Z.; Wang B.; Falzone G.; La Plante E.C.; Okoronkwo M.U.; She Z.; Oey T.; Balonis M.; Neithalath N.; Pilon L.; Sant G.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2018
卷: 23
起始页码: 117
结束页码: 127
语种: 英语
英文关键词: Cementation ; CO2 ; Concrete ; Fly ash ; Strength ; Upcycling
Scopus关键词: Byproducts ; Calcium ; Carbon dioxide ; Cementing (shafts) ; Cements ; Coal ash ; Coal combustion ; Compressive strength ; Concretes ; Fly ash ; Fuels ; Mobile agents ; Portland cement ; Processing ; Beneficial utilizations ; Cementation ; Clinkering reactions ; Industrial by-products ; Ordinary Portland cement ; Processing temperature ; Strength ; Upcycling ; Magnesium compounds
英文摘要: The production of ordinary portland cement (OPC) is a CO2 intensive process. Specifically, OPC clinkering reactions not only require substantial energy in the form of heat, but they also result in the release of CO2; i.e., from both the decarbonation of limestone and the combustion of fuel to provide heat. To create alternatives to this CO2 intensive process, this paper demonstrates a new route for clinkering-free cementation by the carbonation of fly ash; i.e., a by-product of coal combustion. It is shown that in moist environments and at sub-boiling temperatures, Ca-rich fly ashes react readily with gas-phase CO2 to produce robustly cemented solids. After seven days of exposure to vapor-phase CO2 at 75 °C, such formulations achieve a compressive strength of around 35 MPa and take-up 9% CO2 (i.e., by mass of fly ash solids). On the other hand, Ca-poor fly ashes due to their reduced alkalinity (i.e., low abundance of mobile Ca- or Mg-species), show limited potential for CO2 uptake and strength gain—although this deficiency can be somewhat addressed by the provision of supplemental/extrinsic Ca agents. The roles of CO2 concentration and processing temperature are discussed, and linked to the progress of reactions and the development of microstructure. The outcomes create new pathways for achieving clinkering-free cementation while enabling the beneficial utilization (“upcycling”) of emitted CO2 and fly ash; i.e., two abundant, but underutilized industrial by-products. © 2017 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112001
Appears in Collections:气候减缓与适应

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作者单位: Laboratory for the Chemistry of Construction Materials (LC2), Department of Civil and Environmental Engineering, University of California, Los Angeles, CA 90095, United States; Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, United States; University of California, Department of Mechanical and Aerospace Engineering, Los Angeles, CA 90095, United States; Institute for Technology Advancement, University of California, Los Angeles, CA 90095, United States; School of Sustainable Engineering and the Built-Environment, Arizona State University, Tempe, AZ 85287, United States; California Nanosystems Institute (CNSI), University of California, Los Angeles, CA 90095, United States

Recommended Citation:
Wei Z.,Wang B.,Falzone G.,et al. Clinkering-free cementation by fly ash carbonation[J]. Journal of CO2 Utilization,2018-01-01,23
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