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Effect Of High Standard Of Temperature On The Hardened Needled Concrete

Submitted2012-04-04
Last Update2012-04-04
TitleEffect Of High Standard Of Temperature On The Hardened Needled Concrete
Author(s)Author #1
Author title:
Name: Asmaa M. Ali
Org: Assistant Lecturer, Al-Mustansiriya University, College of Engineering, Civil Engineering Department, Iraq, Baghdad.
Country:
Email: asumahdi2@yahoo.com

Other Author(s)
Contact AuthorAuthor #1
Alt Email: asumahdi2@yahoo.com
Telephone:
KeywordsSteel fiber, Hardened concrete, High strength, Elevated temperature.
AbstractFibers 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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