Abstract
There are some methods to exfoliate and remove compulsorily the surface of concrete and a building stone. However, the method for obtaining certain width and depth is limited further. And since a method is outdoor work, it needs to be a movable means. Also it is desirable to be not compulsory heavy labor but non-contact, and for it to be able to operate by remote control by demolition work, especially. As one trial for that purpose, the method of laser processing is appropriate. For example, the breakwater of the coastline and huge structures which were polluted with radioactivity, they are not easy to demolish, to remove and to make land flat. When removing the surface of the concrete polluted by radioactivity, the whole big structures made by concrete may not need to be completely removed from the land. Furthermore, it may be able to use again only by removing the surface portion. And establishment of the technology is hurried.
