International Science and Technology Journal

Fibers glass are tiny white filaments (18 micron) long (12 microns) diameter, His Advantages is reduced Plastic Shrinkage Cracks ,Reduced Water & Chemical Permeability , Increased Abrasion Properties ,Improved Freeze/Thaw Resistance and Increased Impact Resistance. One of these forces encountered by concrete is tension ,It is known the concrete resistance to tension is very little compared with its resistance to compression because of its brittleness. Still, the tension has great importance which should be taken in consideration when designing some constructional elements such as slabs and beams. Accordingly, the aim of this research is studying deflection of the concrete beams with fiber glass together with studying the effect of the substance on the collapsing load, The fiber glass is mixed with the concrete at little rates. Four concrete beams with dimensions (70,20,10 cm) in two kinds of concrete; one of them is normal concrete for control, and the other was mixed with fiber glass. Fibers was put in the costing mould at different depths of the bottom level of the beams at distances of 1/3,1/2,1/1 of the beam depth , All the beams were exposed to bending teste, At the end of the study, It was clear that fiber glass had an important role in improving the concrete material as it increases the hardness of the concrete, and delayed the collapse of the beams as the area of fiber glass in the tensile area.