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A platform for research: civil engineering, architecture and urbanism
Frost and frost-deicing salt resistance of supersulphated cement concrete
The present paper reports on investigations made into a cement very rich in granulated blast-furnace slag (>75% granulated blast-furnace slag) and chemically activated by sulphates: supersulphated cement. The frost and frost-deicing salt resistance of supersulphated cement concrete is very low. Tests have shown that just as with blast-furnace cement concrete the carbonation of supersulphated cement concrete leads to a coarser microstructure and to the formation of metastable CaCO3 modifications. Due to the strong tendency of ettringite towards carbonation the rate of carbonation is, however, even higher than that of blast-furnace cement concrete. Various ways of improving the frost-deicing salt resistance, such as the improvement of curing, the reduction of the water-to-cement ratio, the use of a curing agent as well as the use of draining formwork material have been explored. The required improvement of the frost-deicing salt resistance could only be achieved by means of the draining formwork material.
Frost and frost-deicing salt resistance of supersulphated cement concrete
The present paper reports on investigations made into a cement very rich in granulated blast-furnace slag (>75% granulated blast-furnace slag) and chemically activated by sulphates: supersulphated cement. The frost and frost-deicing salt resistance of supersulphated cement concrete is very low. Tests have shown that just as with blast-furnace cement concrete the carbonation of supersulphated cement concrete leads to a coarser microstructure and to the formation of metastable CaCO3 modifications. Due to the strong tendency of ettringite towards carbonation the rate of carbonation is, however, even higher than that of blast-furnace cement concrete. Various ways of improving the frost-deicing salt resistance, such as the improvement of curing, the reduction of the water-to-cement ratio, the use of a curing agent as well as the use of draining formwork material have been explored. The required improvement of the frost-deicing salt resistance could only be achieved by means of the draining formwork material.
Frost and frost-deicing salt resistance of supersulphated cement concrete
Knaack, U. (author) / Stark, J. (author)
1997
7 Seiten, 4 Bilder, 1 Tabelle, 5 Quellen
Conference paper
English
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