It is well known that the moisture curing is serious influence on the strength development of concrete. In this study, the influence of moisture curing on the strength development of concrete is analyzed quantitatively. In the experiment, the strength development, the free water content and the bonding water were examined on the 3 strength level concrete in various humidity conditions. The results of this study are as follows; The content of free water in concrete is low in case of low humidity. The quantity of bonding water is low in case,of low moisture content. The strength development of concrete becomes small when the relative humidity become low. The mathematical model for the rate of hydration is established. The compressive strength could be calculated by the mathematical model.
