Akademik Veri Yönetim Sistemi
Ankara International Congress on Scientific Research - VII, Ankara, Türkiye, 2 - 04 Aralık 2022, ss.521-529, (Tam Metin Bildiri)
The exposure of elevated temperature to the concrete structures is one of the most destructive
process that effects their stability and durability during service life. Therefore, it is important
to assess the strength of concrete exposed to high temperature effect. Within this scope, the fiber reinforced self-compacting concrete (SCC) samples were exposed
to elevated temperatures up to 750°C with the increment of 250°C in this study. Besides, the
effect of incorporation of polypropylene (PP) fiber and micro steel fiber on elevated
temperature behaviour of macro steel fiber reinforced SCC (MA-FRSCC) were investigated.
PP and micro steel fiber were utilized as binary blend of macro steel fiber. Thus, three mixes
were designed; SCC with only macro steel fiber, SCC with binary fiber hybridization of
macro steel fiber and PP as well as SCC with binary fiber hybridization of macro and micro
steel fiber. The hardened properties including compressive (fc), splitting tensile (fct) and
flexural strengths (ff) of the samples were determined both at the room temperature of 25°C
and after the exposure of 250°C, 500°C and 750°C temperatures. The strengths of these
samples were compared with the residual strength values obtained exposing the samples to the
target temperatures. Test results showed that the use of micro steel fiber as binary with macro
steel fiber improved the residual fc and fct with regards to the use of only macro steel fiber
while it decreased the residual ff values. On the other hand, the incorporation of PP with
macro steel fiber caused a reduction in the residual fc but it enhanced both the residual fct and
ff of the samples compared to the use of single macro steel fiber. Moreover, after being
exposed to 750°C, approximately 32% of fc and fct of samples was retained while this value
was found as 25% for ff. It was also found that although the use of different type of fibers
showed different effects on the residual strengths, the residual strength values of all fiber
reinforced SCC samples were found as so close to each other at 750°C.