A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A high strength fiber reinforce concrete (FRHPC) was presented. This concrete is used for special structural applications demanding high strengths, corrosion and fire resistance. The matrix has a very large content of microsilica and water/binder ratios of typically 0.16 and lower. The matrix is very ductile, so it is possible to utilise rebars much more effectively without having large cracks under service conditions. The high fiber content makes the HPC suitable for precast applications. Results on the durability and fire resistance of this class of concrete is presented in this paper. The durability is much better than that of conventional concrete and FRHPC has no freezing and thawing problems. Also carbonation proceeds at an extremely slow rate. The chloride resistance is also better and CRC can sustain much higher loads than conventional structures in reinforced concrete. A corrosion test was performed under load and the results were presented. AS CRC has a very low porosity research has also been performed with regard to its fire resistance and compared with conventional concrete. Both materials showed spalling, but the residual strength of the CRC was 24 MPA, whereas conventional concrete could be crumbled by hand one week after exposure to the fire. The fire resistance was also studied in dependence of drying. Young CRC specimens that had not been allowed to dry showed explosive spalling, whereas samples dried at 45 deg C or 80 deg C showed no spalling after 30 minutes of exposure to a standard fire.
A high strength fiber reinforce concrete (FRHPC) was presented. This concrete is used for special structural applications demanding high strengths, corrosion and fire resistance. The matrix has a very large content of microsilica and water/binder ratios of typically 0.16 and lower. The matrix is very ductile, so it is possible to utilise rebars much more effectively without having large cracks under service conditions. The high fiber content makes the HPC suitable for precast applications. Results on the durability and fire resistance of this class of concrete is presented in this paper. The durability is much better than that of conventional concrete and FRHPC has no freezing and thawing problems. Also carbonation proceeds at an extremely slow rate. The chloride resistance is also better and CRC can sustain much higher loads than conventional structures in reinforced concrete. A corrosion test was performed under load and the results were presented. AS CRC has a very low porosity research has also been performed with regard to its fire resistance and compared with conventional concrete. Both materials showed spalling, but the residual strength of the CRC was 24 MPA, whereas conventional concrete could be crumbled by hand one week after exposure to the fire. The fire resistance was also studied in dependence of drying. Young CRC specimens that had not been allowed to dry showed explosive spalling, whereas samples dried at 45 deg C or 80 deg C showed no spalling after 30 minutes of exposure to a standard fire.
Fibre reinforced high performance concrete for precast applications
Hochleistungs-Stahlbeton für Fertigteilanwendungen
Aarup, B. (author)
2000
6 Seiten, 2 Bilder, 5 Quellen
Conference paper
English
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