Alkali-activated slags and glasses
- Pennsylvania State Univ., University Park, PA (United States)
Granulated blast-furnace slags and other glassy materials used in modern cementing systems typically are subject to slower hydration reaction. To overcome is disadvantage slags are used in combination with other more alkaline materials. Portland cement is the most common material, although now alkali and alkaline earth metal oxides chlorides, hydroxides, sulfates and occasionally silicates are also used as activators for slags, fly ashes and other amorphous materials. These alkali activated materials hydrate to form a C-S-H that is in many ways similar to the C-S-H found in ordinary Portland cement, but it exhibits a lower CaO/SiO{sub 2} ratio and more long-range order. The hydration is controlled by a combination of chemical and physical factors, resulting in a denser microstructure, generating lower permeability that characteristics of ordinary portland cement paste. This is very significant for controlling long term performance.
- OSTI ID:
- 214895
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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