HYDRATE COMPOSITION ANALYSIS AND MICRO STRUCTURE CHARACTERISTICS OF PORTLAND CEMENT-BLAST FURNACE SLAG SYSTEM

Abstract

  Using several types of Portland cement and blast furnace slag (BFS), composition of hydration products and micro structure characteristics of Portland cement-BFS system were studied. Hydration of blastfurnace cement shows nonlinear behavior of development for gel water with hydrate precipitate, C-S-H produced from BFS hydration at later age has larger amount of gel water. It is quite different tendency in the case of Portland cement hydration. From the modified microstructure development model, gel porosity of C-S-H has increasing as a function of hydration degree of BFS. The proposed model can well predict the strength development of blastfurnace cement.