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Mechanical behavior of fibre reinforced high performance concrete after exposure to high temperatures
A research Program was carried out on the mechanical behavior of high performance concrete (HPC) reinforced either with steel or polypropylene fibres and subject to a range of high temperatures and cooling regimes. The mechanical properties studied were compressive, flexural, splitting tensile strengths and dynamic modulus of elasticity. The effect of the fibres on restraining the deterioration of mechanical properties of the HPC and the mechanisms were investigated. The influence of the fibres on the probability of spalling was discussed. The pore structure measured by means of mercury intrusion porosimetry was studied to determine the changes occurred in the micro-structure of HPC after exposure to high temperatures. Test results showed that the thoroughly saturated HPC specimens did not spall at a heating rate of 5 to 7 deg C per minute. It was also testified that thermal shock was not a predominant factor to cause spalling of the HPC. HPC reinforced with steel fibre had higher residual properties than those without fibre. This indicates that steel fibre was expected to be beneficial to the fire resistance of HPC elements. The polypropylene fibre used to prevent spalling of HPC did not lead to a reduction in the mechanical properties of the HPC even after it was evaporated at high temperatures.
Mechanical behavior of fibre reinforced high performance concrete after exposure to high temperatures
A research Program was carried out on the mechanical behavior of high performance concrete (HPC) reinforced either with steel or polypropylene fibres and subject to a range of high temperatures and cooling regimes. The mechanical properties studied were compressive, flexural, splitting tensile strengths and dynamic modulus of elasticity. The effect of the fibres on restraining the deterioration of mechanical properties of the HPC and the mechanisms were investigated. The influence of the fibres on the probability of spalling was discussed. The pore structure measured by means of mercury intrusion porosimetry was studied to determine the changes occurred in the micro-structure of HPC after exposure to high temperatures. Test results showed that the thoroughly saturated HPC specimens did not spall at a heating rate of 5 to 7 deg C per minute. It was also testified that thermal shock was not a predominant factor to cause spalling of the HPC. HPC reinforced with steel fibre had higher residual properties than those without fibre. This indicates that steel fibre was expected to be beneficial to the fire resistance of HPC elements. The polypropylene fibre used to prevent spalling of HPC did not lead to a reduction in the mechanical properties of the HPC even after it was evaporated at high temperatures.
Mechanical behavior of fibre reinforced high performance concrete after exposure to high temperatures
Mechanisches Verhalten von faserverstärktem Hochleistungsbeton nach Hochtemperaturauslagerung
Sammy Yin Nin Chan (author) / Xin Luo (author) / Sun, Wei (author)
2000
9 Seiten, 9 Bilder, 1 Tabelle, 14 Quellen
Conference paper
English
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