Iron disintegration of air-cooled blast-furnace slag

2 Iron disintegration of air-cooled blast-furnace slag 

This test is used on crushed air-cooled blast-furnace slags for determining their sensitivity to disintegration as a consequence of iron and manganese sulfide hydrolysis. 

According to CEN EN 1744-1 (2009), paragraph 19.2, the disintegration of iron occurs by ageing in a humid atmosphere, in rain or more rapidly in water. It is observed by examination of slag particles that have been immersed in water. 

Thirty slag particles of size 40 to 150 mm are immersed in water at 20 C 2°C for 2 days. If one or two particles crack or disintegrate, the test is repeated for another 30 particles. If a particle cracked or disintegrated again, the slag does not pass the test. 

More details and information about the test are given in CEN EN 1744-1 (2009). 

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Dicalcium silicate and iron disintegration of air-cooled blast-furnace slag (CEN EN 1744-1 2012, paragraphs 19.1 and 19.2)... 

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