This paper investigates the effect of recycled gravel obtained from low (Gl) or medium (Gm) concrete grade on fresh property of concrete (slump), mechanical properties (compressive-splitting tensile strength) and mass transport properties BCAA (ISAT-sorptivity) of concrete containing dolomite as a natural coarse aggregate.Concrete specimens were prepared with cement, water, sand and dolomite admixed with recycled gravel.The percentage of recycled gravel/dolomite was 0:100, 25:75, 50:50 and 75:25 at w/c = 0.
50, 0.55 and 0.60.
The effect of silica fume and bonding admixture at w/c = 0.55 on concrete properties were also considered.The results indicated that, increasing the percentage of recycled gravel/dolomite led to decreasing the slump.
All mechanical properties of concrete discussed were inversely affected by increasing percentage of recycled gravel/dolomite from low and medium concrete.Adding 10% SF or bonding admixture increased the mechanical Graduation Cap Topper properties of concrete.Mass transport properties of concrete (ISAT-sorptivity) were enhanced by decreasing the percentage of recycled gravel/dolomite.
The optimum percentage of recycled gravel/dolomite = 25%.Keywords: Recycled gravel, Concrete, Silica fume, Compressive strength, Mass transport.