Abstract
Cement paste specimens with different types of cement were prepared under the different drying conditions and the porosities were measured by the mercury porosimetry. The relations between the compressive strength and the static modulus of elasticity of the specimens were measured and the relations with the porosity were applied to Ryshkevich's and Springs's equations. These equations were good applicability to the experimental results. And, in comparison with the results of Gilkey, the rate of increase of the compressive strength of air-cured specimen after immersing water became larger. The mechanical properties of concrete with various type of cement can be determined by their porosities of the cement paste, which has of practical importance.