engleski

3D SIMULATION OF CEMENT PASTE AGING DUE TO REACTIVE TRANSPORT

The relationship between pore structure and transport properties of cementitious materials is a crucial point to run properly in models that couple transport and chemistry. During transport the local microstructure of cement-based material is changing due to the dissolution effect and/or interaction of the diffusing ions with the solid phase. Up to now, the effect of aging on microstructure and evolution of its properties, in three dimensions, was studied only by dissolution of certain phases at random locations. In this paper we present a 3D reactive-transport model and results of leaching-induced aging simulations performed on virtual cementitious microstructures generated by the Hymostruc model. The outputs are the morphology of the aged 3D microstructure together with aged properties characterized by a fuzzy state of each voxel at different times. This allows simulating the evolution of properties as a function of time as well as a function of the location within the microstructure.

3D reactive-transport; pore-scale model; cement based materials; Ca leaching.

Keynote lecture of the session E. Transport