In order to verify degradation with time for concrete wall of experimental building offered open during 31 years, the authors have investigated compressive strength, carbonation and moisture content with concrete core. As the result of several experiments, we confirmed that all compressive strengths of concrete core were higher than design strength Fc240kgf/cm2, carbonation speed for outside of walls was 2.58mm/√years, inside was 4.77mm/√years, and that the carbonation speed notably depended on moisture content of concrete surface in spite of outside or inside of concrete wall.
