Because of the massive environmentally unsustainable output from industrialization, concrete can benefit from
using glass powder (GP) as a cement replacement to achieve sustainability. This research addresses the experimental
results for seven reinforced concrete (RC) slabs containing recycled GP and steel fibers (SF) under
flexure. The experimental variables are the replacement ratios of GP by cement weight (0 %, 10 %, and 20 %),
the addition of SF (0 %, 0.5 %, and 1 %), slab thickness (100 mm and 120 mm), and the ratio of longitudinal
reinforcement (0.61 % and 0.86 %). The load–deflection curves, load-steel strain relationships, stiffness,
ductility, and toughness are plotted and calculated. Test results showed that the compressive and splitting
strengths of concrete mixes containing 10 % GP at 28 days increased by 4.7 % and 1.7 %, respectively, compared
to the conventional concrete. For the case of the 20 % addition of GP, the compressive and splitting strengths
decreased by 10.7 % and 5.9 %, respectively compared to the conventional concrete. Experimental results
indicated that utilizing GP as a substitute for cement by 10 % and 20 % shows an acceptable performance of RC
slabs and 10 % GP is the optimum replacement ratio that is suitable for use in concrete mixes. Slabs containing
10 % GP indicated an increase in the failure loads by 8.8 % and that has 20 % GP indicated insignificant reductions
in the failure and crack loads by 14.7 % and 5.9 % respectively. The addition of SF to concrete containing
GP improved the performance, toughness, and stiffness of RC slabs. Finally, a comparison between the
results of the experiment and the provisions of different design codes was performed and a good agreement has
been reported. The average value between the predicted and experimental load capacities was 0.99 with a
standard deviation of 0.10