Hydration, Microstructure, and Chloride Diffusion of Slag-Cement Pastes and Mortars

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Title: Hydration, Microstructure, and Chloride Diffusion of Slag-Cement Pastes and Mortars

Author(s): Della M. Roy

Publication: Special Publication

Volume: 114

Issue:

Appears on pages(s): 1265-1282

Keywords: activation; blast furnace slag; chlorides; diffusion; hydration; microstructure; mortars (material); pastes; porosity; slag cements; Materials Research

Date: 5/1/1989

Abstract:
Cement pastes and mortars prepared with ASTM Type I cement and 50, 65, 70, and 85 percent granulated blast furnace slag have been investigated. The chloride diffusion rate and permeability of the pastes and mortars show pronounced decreases from the control portland cement pastes and mortars. The decreases are related to the refined microstructures. The pore structure of hardened slag-containing paste is dominated by the pores with radiums finer than 5 nm. But for neat cement paste, the majority of pores range from 5 to 20 nm. This difference in pore size distribution makes the pastes behave quite differently in diffusion and transport processes. The reduction of effective porosity makes the pastes blended with slag much more resistant to chloride diffusion.