Classification of Fly Ash According to Japan Industrial Standard, JIS A 6201-1999

摘要

The Japan Industrial Standard (JIS) of "Fly Ash for Use in Concrete, JIS A 6201, " was revised in 1999 in order to widen the utilizable amount of fly ash as a mineral admixture. The featured points in this revision were that; fly ash with high loss on ignition (LOI) ranging from 5.0% to 8.0% is specified as Class- Ⅲ , fly ash with low Blaine fineness ranging from 1500cm~2/g to 2500cm~2/g is specified as Class-Ⅳ, high quality fly ash with LOI less than 3.0% and Blaine fineness more than 5000cm~2/g was specified as Class-Ⅰ. Most of the fly ash qualified in JIS A 6201-1996 would be specified as Class-Ⅱ. Class-Ⅲ and Class-Ⅳ fly ash wouldn't meet the requirement of JIS A 6201-1996. This paper describes the background and the contents of the revision of JIS A 6201.