581-586<span style="font-size:9.0pt;mso-bidi-font-size:
12.0pt;font-family:" times="" new="" roman";mso-ansi-language:en-us"="" lang="EN-US">Behavior of
reinforced concrete is strongly affected by bonding between concrete and
reinforcing bar. It is well known that adherence among concrete and reinforcing
bar is remarkably influenced by several properties of reinforced concrete
including compressive strength, tensile strength and cover depth. On the other
hand, adherence of reinforcing bar is influenced from cross-sectional
dimension, embedment length, corrosion and curing conditions. Another
significant parameter which adversely affects bonding between concrete and reinforcing bar is high
temperature. Thereby, in this investigation, an experimental study is performed
to assess the effect of high temperatures on several properties of reinforced
concrete. Consequently, an attempt is made to establish correlations among the
determined parameters designating the bonding between concrete and
reinforcement bar. Additionally, image processing techniques are utilized to
quantify the morphological properties of cracks occurred. It is found that,
when temperature rises beyond 500oC, behavior of reinforced concrete
is dominated by bonding between concrete and reinforcing bar, rather than
individual mechanical properties of concrete and reinforcing bar.
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