Abstract
The pore surface potential affects the diffusion coefficient of ion in concrete. It is important for durability assessment of construction to forecast ion transport quantitatively. Therefore, the authors forcused on zeta potential which can be approximative value of the pore surface potential. The purpose of this study is to evaluate the effects of the ion composition of pore solution, the amounts and kinds of hydration products, and solution temperature on the zeta potential of the hardened cementitious materials.
In this study,（1）the effects of zeta potential were investigated by varying the solution temperature,（2）Zeta potential of hardened materials were estimated by using each solution simulating the pore solution of hardened materials, and integtrating the amounts, specific surface area and zeta potential of each hydration product which constitutes the hardened materials.
As the result,（1）the effects of zeta potential were investigated by varying the solution temperature. Changes in zeta potential with solution temperature were mainly due to changes in calcium ion concentration of liquid phase.（2）the calculated values of the zeta potential of hardened cementitious materials using mineral admixture were lower than experimental results. Then, the improvement of estimation accuracy was observed by considering C-A-S-H and calcium aluminate hydrate. Consequently, the zeta potential of hardened materials can be estimated in consideration of the zeta potential of each hydration.
