Abstract—An experimental work was carried out to produce six mixes Self Compact Concrete with weight ratio [fine/coarse] aggregate ≈1.0, three with steel fiber, and the other without. This research study the effect of using lightweight aggregate in concrete as an alternative to normal weight aggregate, depends on the basis of volumetric fractions (Porcelinite coarse aggregate replacing the natural river gravel as a Mix2 ) and (Porcelinite fine aggregate replacing the sand as a Mix3) on the mechanical properties (Compressive Strength, Splitting Tensile Strength and Unit weight (density)). In addition the effect of these replacements on mechanical properties of concrete with steel fiber-volume fraction (Vf)=0.8% (MixF2 and MixF3) was studied. It is generally found that Mix2 and Mix3 lead to a decrease in compression, tensile strength and Unit weight (density) in comparison to reference Mix (Mix1, normal weight aggregate), However the percentage of decreasing of Mix2 on compression, tensile strength was found to be higher than the percentage of decreasing of Mix3. On the other hand this work studied the effect of adding steel fiber - volume fraction (Vf) on mechanical properties of two mixes groups [mix1, mix2 and mix3] and [mixF1, mixF2 and mixF3] having steel fiber -volume fraction of 0.0%, 0.8%, respectively and found that the tensile strength was increased significantly with adding steel fiber while the compressive strength and unit weight (density) was slightly increased. 

Index Terms—lightweight concrete, porcelinite, self compact concrete, steel fiber, mechanical properties

Cite: Ahmed S.D. AL-Ridha, "The Influence of Size of Lightweight Aggregate on the Mechanical Properties of Self-Compacting Concrete With and Without Steel Fiber," International Journal of Structural and Civil Engineering Research, Vol. 3, No. 1, pp. 54-68, February 2014.