الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Radical new advancements are occurring in the cement sciences resulting in
a new generation of high performance self-compacting concrete (HPSCC).
HPSCC is characterized by high compressive strength and excellent durability
properties resulting in lighter structures and longer life. With advances in concrete
technology, HPSCC has become a new focus for researchers and the concrete
industry. Each new generation of this concrete is stronger than the previous, and
the applications of this super strong blend are endless. HPSCC is a modern
creation that is changing the way we look at construction; it is designed primarily
for use in large construction projects (pouring rates of about 1O,000m3/day) such
as those projects began to have presence in our middle east. Since fire represents
one of the most severe environmental conditions to which structures may be
subjected in their life time. Furthermore, there is still a lack in the understanding
the performance of HPSCC structures in real fires due to the severe lack of data
available in this field. Based on this fact this research aims to study the effect of
high elevated temperature and direct fire on the performance of HPSCC. This
study is conducted on three parts.
The first part of this study is carried out to study the effect of high
temperatures on the mechanical strengths of HPSCC. Four concrete mixes were
investigated. The first mix represented HPSCC without fibers. The second mix
represented HPSCC including steel fibers. The third mix represented HPSCC
including steel and micro-polypropylene fibers. The fourth mix represented
HPSCC including steel, polypropylene and polyolefin fibers. The average
compressive strength of the investigated concrete mix was 130 MPa. Compressive,
tensile and flexural strengths were measured at room temperature (RT) and after
exposure to high temperatures of 2000C, 4000C, 6000C and 7500C for 2 hours.
The residual unstressed test method is followed. Microscopic examination using
Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM).