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A study on the surface modification of artificial lightweight aggregates by using bottom ash from coal power plant  

Ryu, Yug-Wang (Department of Materials Engineering, Kyonggi University)
Kim, Yoo-Taek (Department of Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.19, no.4, 2009 , pp. 208-213 More about this Journal
Abstract
Artificial lightweight aggregates were produced by using bottom ashes and dredged soils from coal power plant. The amount of glassy phases on the aggregate surfaces, specific gravities, absorption rates, and observations of cross-sectional surfaces were compared according to the compositions, sintering temperatures, and the amount of coating. It is concluded that surface modification by 10 % $CaCO_3$ coating on the aggregate surfaces enhances the properties of aggregates as follows: Specific gravities were controlled by depressing formation of large pores in the aggregates. Sticking phenomena among aggregates during the sintering process was drastically decreased by reducing glassy phases on the aggregate surfaces. Pumping problems during the application of ready-mix concretes containing lightweight aggregates having high value of absorption rates could be solved by reducing the absorption rate.
Keywords
Aggregates; Bottom ash; $CaCO_3$; Coating;
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Times Cited By KSCI : 1  (Citation Analysis)
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