Abstract
The applicability of fly ash recently used in Japan was evaluated in this paper. The characteristics of 45 batches of fly ashes obtained in Japan in 2007 are evaluated and the results show that there were large differences in physical characteristics due to the degree of grinding of the coal and the chemical composition of coal ash. The recently evaluatiion method of fly ash in Japan is not considered to be suitable by change of methylene blue color because the chemical characteristics of Ph and ORP (oxidation reduction potential) are defferent in each fly ashes. The results of the measurement of air-entraining content in mortar show that there was a tendency when the air-entraining capability reduced with the increase of the Igloss value, the brain specific surface area value, and the BET specific surface area value. The adsorption character of the air-entraining agent can be expressed approximately by the BET adsorption formula. There was a good correlation between the air-entraining content and the BET specific surface area of fly ash, cement and fine aggregate. The high purity of limestone crushed sand with a low specific surface area is suitable for accurately evaluation for higher specific surface area of fly ash.
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