Studies have been conducted in recent years using fibers, such as carbon fiber, aramid fiber, glass fiber, and vinylon, in place of steel bars for reinforcing concrete. Being encased in concrete, these fiber are exposed to a highly alkaline environment. It is therefore necessary to grasp the alkali resistance and acid resistance of continuous fiber bar, which consists of fibers and a binder (matrix), both of which are in many cases made of high polymer. In this study, we immersed continuous fiber bars in a mixture of Ca(OH)_2, KOH and NaOH at a high temperature of 80℃. As deterioration was observed in tension tests, the state of deterioration on the cross section of these continuous fiber bars was measured by an electron microscope and EDS to grasp the physical deterioration phenomenon.
