FIBER REINFORCED CONCRETE

Abstract

The increasing interest in the use of various fibre types to improve propetties of concrete led to this comparison study using both steel and polypropylene fibers . For steel fibers the parameters studied were steel fibre content,

silica fume content and sand /,gravel ratio . The test specimens were classified into different groups , in which a parameter was varied with the other two parameters were kept constant . The effect of such parameters on both fresh and hardened concrete properties were investigated . For polypropylene fibres the parameters studied were polypropylene

fibre len1:,1h , polypropylene fibre content , silica fume content , sand I gravel ratio and aspect ratio . The test specimens were classified into different t,Yfoups in which a parameter was varied and the other parameters were kept constant . The effect of such parameters on both

fresh ai1d hardened concrete propetties were investigated .

Also eight fibre reinforced concrete simply supported beam spectmens having under reinforced sections were tested in this work . The main parameters for these beams were the fibre type (steel - polypropylene) , thickness of the fibrous concrete layer cast in the beams tension zone . The effects of the given parameters on cracking load , ultimate load , deflections , strains and crack pattem were investigated . The important results were given in the conclusions . The impmiant recommendations and future studies are suggested .