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After excavation by red blasting, red sandstone is rapidly weathered and disintegrated by the action of sunlight, the atmosphere, and especially rainwater. It is disintegrated from massive weathering to pieces. When there is rain or water, it is mechanically affected (automobile, Excavator) and manpower become slush-like, but the red sandstone that is reassembled after crushing has small bonding performance, and cannot be reversed from slush-like to lumpy and large.