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A platform for research: civil engineering, architecture and urbanism
Resistance to chemical and physiochemical degradation
The influence of silica fume (SF) on concrete resistance towards chemical and physiochemical degradation is dominated by the reduction of permeability by SF addition and the pozzolanic reaction consuming calcium hydroxide and forming extra binder. When SF is not used to obtain equal strength at higher w/cm than reference, but to obtain high performance concrete with lower w/cm including plasticisers, no durability problems are known. On the contrary, the application of SF in concrete reduces the intrusion of external water born aggressives like chlorides and sulphates and also reduces internal degradation mechanisms like alkali-aggregate reactions (AAR) and delayed ettringite formation (DEF). Carbonation rate is about equal to reference if w/cm < 0.6.
Resistance to chemical and physiochemical degradation
The influence of silica fume (SF) on concrete resistance towards chemical and physiochemical degradation is dominated by the reduction of permeability by SF addition and the pozzolanic reaction consuming calcium hydroxide and forming extra binder. When SF is not used to obtain equal strength at higher w/cm than reference, but to obtain high performance concrete with lower w/cm including plasticisers, no durability problems are known. On the contrary, the application of SF in concrete reduces the intrusion of external water born aggressives like chlorides and sulphates and also reduces internal degradation mechanisms like alkali-aggregate reactions (AAR) and delayed ettringite formation (DEF). Carbonation rate is about equal to reference if w/cm < 0.6.
Resistance to chemical and physiochemical degradation
Chemische und physikalisch-chemische Beständigkeit von Beton
Justnes, H. (author)
2002
6 Seiten, 4 Bilder, 18 Quellen
Conference paper
English
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