Influence of Fine Aggregate Grading on Some Properties of Self–Compacting Concrete

Abstract

Self compacting concrete ( SCC ) can be classified as high – performance concrete .It does not require to be vibrated to achieve full compaction. This offers many benefits and advantages over conventional concrete. The main object of this work was to investigate the properties of SCC produced by locally available materials and to evaluate the effect of grading of fine aggregate ( Coarse Grading CG , Medium Grading MG, and Fine Grading FG ) with fineness modulus ranging from (1.9 to 2.7) on some properties of SCC. To achieve this aim, three different mixes of SCC were designed and tested. The used cement content was ( 350 kg/m³), the powder content material ( cement + limestone dust) maintained constant (500 kg/m³ ) and the water/powder content ratio was ( 0.34). To determine the workability, different test methods were adopted as slump flow, J-ring, and L –box tests. It is found the workability of all studied mixes is good, with slump flow diameter greater than or equal to (600 mm), and flow times ranging between (3 and 7.5)sec. while the step of blocking ranges between (0 and 1)mm. The mechanical properties of hardened SCC mixes are also assessed. (compressive strength, splitting tensile strength, modulus of rupture, static modulus of elasticity, and density).