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Fiber reinforced high strength concrete: residual strength and pore structure subjected to high temperatures
The mechanical properties and Pore structure of fiber reinforced high strength concrete subjected to different high temperatures and cooling regimes were investigated. The results showed that the residual strength of high strength concrete with or without fibers worsened after exposure to high temperatures. Evident drop in compressive and splitting tensile strengths took place between 400 deg C and 600 deg C. However, the decline in flexural strength mainly took place before 400 deg C. Among the specimens, the concrete with 10% of silica fume, 25 % of fly ash and 1 % of steel fiber provided the highest residual strength and relative residual strength. Steel fibers played a significant role in preventing the worsening of the mechanical properties, particularly at the temperature from 400 deg C to 600 deg C. Thermal stress was not the key factor that caused the spalling or explosive spalling in high strength concrete under high temperatures. The re-curing brought recovery of the residual strength in the concretes damaged at high temperatures due to the remarkable improvement of the pore structure.
Fiber reinforced high strength concrete: residual strength and pore structure subjected to high temperatures
The mechanical properties and Pore structure of fiber reinforced high strength concrete subjected to different high temperatures and cooling regimes were investigated. The results showed that the residual strength of high strength concrete with or without fibers worsened after exposure to high temperatures. Evident drop in compressive and splitting tensile strengths took place between 400 deg C and 600 deg C. However, the decline in flexural strength mainly took place before 400 deg C. Among the specimens, the concrete with 10% of silica fume, 25 % of fly ash and 1 % of steel fiber provided the highest residual strength and relative residual strength. Steel fibers played a significant role in preventing the worsening of the mechanical properties, particularly at the temperature from 400 deg C to 600 deg C. Thermal stress was not the key factor that caused the spalling or explosive spalling in high strength concrete under high temperatures. The re-curing brought recovery of the residual strength in the concretes damaged at high temperatures due to the remarkable improvement of the pore structure.
Fiber reinforced high strength concrete: residual strength and pore structure subjected to high temperatures
Luo, X. (author) / Sun, W. (author) / Zhang, Y.M. (author) / Chan, S.Y.N. (author)
2003
13 Seiten, 10 Bilder, 1 Tabelle, 15 Quellen
Conference paper
English
| British Library Online Contents | 2004
Residual Strength of High-Performance Concrete Subjected to High Temperatures
| British Library Conference Proceedings | 1997