Experimental Study on Influence of ITZ around Aggregate on Cl- Diffusivity of Concrete
Nobuaki OTSUKI, Takahiro NISHIDA, Pitiwat WATTANACHAI and Kyoku Chin
Abstract:The purpose of present paper is to study the influence of the properties, such as thickness or Cl- diffusivity, of Interfacial Transition Zone (ITZ) between aggregate (fine and coarse aggregate) and cement paste. To accomplish this propose, the evaluation methods for determining the thickness and the Cl- diffusion coefficient of ITZ were developed. Subsequently, these methods were used in the investigation to assess the influence of aggregate size on the hickness and the Cl- diffusivity of ITZ formed. Moreover, the influence of ITZ formed around fine and coarse aggregate on the Cl- diffusivity in concrete was clarified using the data obtained by above methods. Key Words:Fine and coarse aggregate, ITZ, Cl- diffusivity, Aggregate size, Concrete