| Surface of FRP often shows various kinds of appearance changes through the exposure in the outdoor environment. In some cases, these appearance changes seem to be caused not only by deterioration but also by biological reasons such as mold. There are some previous reports that industrial materials are affected by mold; however, there are not so many studies of the present state of mold on the FRP use as a construction structural materials. The authors collected the examples of mold on FRP used in the outdoor environment, and the examples were categorized based on observation by the naked eye into four cases. Observations by digital and biological microscopes were also carried out for the each case. Observation results can explain that these cases were mainly caused by mold or microbe. Identification including the cultivation test is not finished for these cases, but it is planned in the future. |
