The humidity response law in concrete in the natural environment

Based on the saturation vapor pressure equation,the relation between the relative humidity and the water vapor density was investigated.The humidity change laws of the natural environment and the concrete were also studied.By analyzing the humidity change law,the natural environment humidity action spectrum and the concrete humidity response spectrum models were deduced.The results show that the natural environment humidity action spectrum and the concrete humidity response spectrum models can be used to describe the humidity change law.With the time,the relative humidity curve of the natural environment displays as cyclical fluctuation.Conversely,the relative humidity in concrete displays as linear change.Comparing with the relative humidity,the water vapor density can be wonderfully used to describe the humidity change under different condition.