TY - JOUR
T1 - Fractional characteristics of coal fly ash for beneficial use
AU - Zhu, Zhenwei
AU - Wang, Xiqing
AU - Dai, Sheng
AU - Huang, Baoshan
AU - He, Qiang
PY - 2013/1
Y1 - 2013/1
N2 - As a primary by-product of coal combustion produced in large quantities, coal fly ash is a material receiving considerable interest for potential large-scale engineering applications. However, the beneficial use of coal fly ash in concrete production and contaminant removal, which have divergent constraints to sorption capacity, requires a more complete understanding of the surface and sorptive characteristics of fly ash. A systematic analysis of fly ash particle size fractions established linkages between particle size, particle morphology, unburned carbon content, surface area, and sorption capacity. Unburned carbon was enriched in fly ash fractions of the largest particle sizes and associated with irregularly shaped particles. Further, most of the surface area and sorption capacity of fly ash could be attributed to unburned carbon. More importantly, unburned carbon content, specific surface area, and methylene blue sorption capacity were shown to strongly correlate to one another, providing a potentially quantitative basis for understanding the surface properties of fly ash and developing more effective process options to enhance the fly ash sorption behavior desirable for specific engineering applications.
AB - As a primary by-product of coal combustion produced in large quantities, coal fly ash is a material receiving considerable interest for potential large-scale engineering applications. However, the beneficial use of coal fly ash in concrete production and contaminant removal, which have divergent constraints to sorption capacity, requires a more complete understanding of the surface and sorptive characteristics of fly ash. A systematic analysis of fly ash particle size fractions established linkages between particle size, particle morphology, unburned carbon content, surface area, and sorption capacity. Unburned carbon was enriched in fly ash fractions of the largest particle sizes and associated with irregularly shaped particles. Further, most of the surface area and sorption capacity of fly ash could be attributed to unburned carbon. More importantly, unburned carbon content, specific surface area, and methylene blue sorption capacity were shown to strongly correlate to one another, providing a potentially quantitative basis for understanding the surface properties of fly ash and developing more effective process options to enhance the fly ash sorption behavior desirable for specific engineering applications.
KW - Fly ash
KW - Particle size distribution
KW - Sorption
KW - Surface properties
UR - http://www.scopus.com/inward/record.url?scp=84876708875&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)MT.1943-5533.0000550
DO - 10.1061/(ASCE)MT.1943-5533.0000550
M3 - Article
AN - SCOPUS:84876708875
SN - 0899-1561
VL - 25
SP - 63
EP - 69
JO - Journal of Materials in Civil Engineering
JF - Journal of Materials in Civil Engineering
IS - 1
ER -