Abstract
Rock wool has sprayed, in order to give firesafety to an Steel columns and beams. Asbestos had been used as one of materials of sprayed rock wool.Since the wet sprayed rock wool is precise and hard, it was not able to apply the conventional containment construction method. We developed encapsulants for wet sprayed asbestos in 2004. The durability of that has been examined over about ten years after it. We did one air erosion examination every year during the first three years and for the last three years. It was checked that encapsulants for wet sprayed asbesutos which we developed, maintains the function to controls asbestos even if it will pass in ten years.
