Abstract
The deck materials using the WPRC receive quite a few worn in outdoor walk environment, and it is thought that it becomes easy to be slippery. We changed a surface state and examined it to grasp that how performance decreased when deck materials were remarkable worn．The examination have done both with a method by JIS and the method by ASTM. As a result that when the surface became smooth, there was no difference in big sliding characteristics if the surface was in a dry state, and the surface became hard to be slippery when it was the water wet. In addition, it became easy to glide slightly when mud attached to the surface. But, in the case of the water wet, the tendency that was reverse to test method by JIS appeared by ASTM. We are going to continue to examine it in order to suggest the test method that is a real walk sense.
