Durability of Concrete Made With Alkali-Activated Slag


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Title: Durability of Concrete Made With Alkali-Activated Slag

Author(s): K. Byfors, G. Klingstedt, V. Lehtonen, H. Pyy, and L. Romben

Publication: Special Publication

Volume: 114


Appears on pages(s): 1429-1466

Keywords: activators; alkalies; concrete durability; freezing; microstructure; reinforcing steels; salts; slag cements; strength; Materials Research

Date: 5/1/1989

Durability properties of concrete and mortar based on a special type of alkali-activated slag called F-cement have been studied. The microstructure was found to possess a high occurrence of microcracks that had an obvious influence on the flexural strength and rate of carbonation. The rate of chloride-ion diffusion was about 30 times lower than in the portland cement concrete. Salt scaling was found to depend solely on the water-to-binder ratio and is independent of the air content. Early freezing takes place when the strength exceeds 5 MPa, and F-mortar shows high chemical resistance against solutions of sodium, calcium, and magnesium chloride.