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Behaviour of ultra high strength concrete at high temperatures
This paper reports results of experimental investigations concerning high temperature behaviour of four ultra high strength concrete mixtures. Two series were made with coarser diabase aggregates (max grain size 3 mm - 6 mm), two only with fine quartz powder (max qrain size 0 125 mm - 0 6 mm). Three series were heat treated at 90 deg C for 48 hours and three series contained PP-fibres (polypropylene fibres). Their cylinder (diameter 70 mm, h = 195 mm) strength was in between 160 N/mm2 and 180 N/mm2. The studies comprised investigations of mechanical properties, behaviour and tests like stress-strain-relations, thermal strain, transient creep strain and restraint tests. Attention was also paid to the chemical and physical background of their alterations due to heating and investigations by aid of simultaneous thermal analysis, dilatometry and Hg-porosimetry were performed. The investigated materials showed very similar behaviour, partly it was comparable with the behaviour of high strength concrete. Specimens containing PP-fibres suffered no spalling during heating
Behaviour of ultra high strength concrete at high temperatures
This paper reports results of experimental investigations concerning high temperature behaviour of four ultra high strength concrete mixtures. Two series were made with coarser diabase aggregates (max grain size 3 mm - 6 mm), two only with fine quartz powder (max qrain size 0 125 mm - 0 6 mm). Three series were heat treated at 90 deg C for 48 hours and three series contained PP-fibres (polypropylene fibres). Their cylinder (diameter 70 mm, h = 195 mm) strength was in between 160 N/mm2 and 180 N/mm2. The studies comprised investigations of mechanical properties, behaviour and tests like stress-strain-relations, thermal strain, transient creep strain and restraint tests. Attention was also paid to the chemical and physical background of their alterations due to heating and investigations by aid of simultaneous thermal analysis, dilatometry and Hg-porosimetry were performed. The investigated materials showed very similar behaviour, partly it was comparable with the behaviour of high strength concrete. Specimens containing PP-fibres suffered no spalling during heating
Behaviour of ultra high strength concrete at high temperatures
Hochtemperaturverhalten von Ultrahochleistungsbetonen
Diederichs, Ulrich (author) / Mertzsch, Olaf (author)
2008
8 Seiten, 7 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
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