Revision of JIS A 6207 "Silica fume for use in concrete"

概要

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Japanese Industrial Standard (JIS) A 6207 "Silica fume for use in concrete" was revised in May 2011. The major revisions are as follows. 1) The loss on ignition of dry silica fume shall be less than 4.0%. 2) W/B for the test of activity index shall be 30%. In Japan, silica fume is primarily used for ultra-high-strength concrete. Therefore, W/B for the test of activity index set in W/B which is near to the general mixture proportion of ultra-high-strength concrete. In addition, the findings of silica fume quality (including content of trace elements and water-soluble trace elements) in Japan and abroad, the findings of overseas standards, and study results of chemical analysis by x-ray fluorescence are listed.