Effect of High Standard of Temperature on the Hardened Needled Concrete

Asmaa M. Ali

Abstract


Fibers are usually used to reinforce concrete. The study shows the using of needles for reinforcing high-strength concrete (60MPa) when the samples are exposed to temperatures (100°C and 400°C) with a percentage of needles (0%, 0.5% and 1%) compared with the conditions of room temperature (25°C). They study shows that the compressive strength decreases by about (0.94% and 17.6%) for (0% needle (steel fiber)) at 100°C and 400°C, respectively. The compressive strength decreases by about (1.7% and 15.9%) for (0.5% needle (steel fiber)) at100°C and 400°C, respectively. The compressive strength decreases by about (0.3% and 14.2%) for (1% needle (steel fiber)) at 100°C and 400°C, respectively. All the above-mentioned results are compared with cubes tested at room temperature (25°C). Based on the results of this work, the tensile strength decreases by about (0.49% and 6.65%) for (0% needle (steel fiber)) at 100°C and 400°C, respectively. The tensile strength decreases by about (0.73% and 6.1%) for (0.5% needle (steel fiber)) at 100°C and 400°C, respectively. The tensile strength decreases by about (0.24% and 5.54%) for (1% needle (steel fiber)) at 100°C and 400°C, respectively. All the above-mentioned results are compared with cubes tested at room temperature (25 °C). The flexural strength decreases by about (1.08% and 26%) for (0% needle (steel fiber)) at 100°C and 400°C, respectively. The flexural strength decreases by about (2.1% and 26.3%) for (0.5% needle (steel fiber)) at 100°C and 400°C, respectively. The flexural strength decreases by about (3.1% and 24.7%) for (1% needle (steel fiber)) at 100°C and 400°C, respectively. All the above-mentioned results are compared with cubes tested at room temperature (25°C).

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