2017 Volume 71 Issue 1 Pages 177-184
The importance of maintenance and repair of existing concrete buildings has increased. Therefore, it is necessary to know the exact deterioration condition of a concrete building structure, so it is required to accurately measure the pore structure. As one of the measurement techniques, thermoporometry has been proposed. Thermoporometry does not need drying and applying high pressure to specimen during measurement, so there is little risk of damage to the cement paste. In this study, we measured some physical property（uniaxial compressive strength, ultrasonic velocity, electric conductivity, and chloride ion diffusion）and pore structure of OPC paste and fly ash cement paste. And we investigated the relationship between the physical properties and the pore structure measured by using thermoporometry and mercury intrusion porosimetry. As a result, the uniaxial compressive strength and the ultrasonic velocity can be estimated by using pore volume measured by thermoporometry and mercury intrusion porosimetry. Transport properties such as the electric conductivity and chloride ion diffusion could be estimated by separating each OPC paste and fly ash cement paste. And it was suggested that the diffusivity could be estimated by using the quantity of pore volume detected in the freezing process around －15℃ which is the connected capillary pore volume.
