In this paper, the flexural behavior of Reinforced Concrete (RC) slabs containing recycled glass powder (GP) and steel fibers was experimentally investigated. Seven various concrete mixes were made with different replacement ratios of GP as a replacement for cement by weight. Also, seven RC slabs were investigated to study the effect of: different replacement ratios of GP (0%, 10%, and 20%), the addition of steel fibers (0%, 0.5%, and 1%) with constant replacement of GP by 10%, the slab thickness (100 mm and 120 mm), and the ratio of longitudinal reinforcement (0.61% and 0.86%). The compressive and splitting strengths of concrete mixes containing 10% GP as cement replacement 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 conventional concrete. The tested RC 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 loads and cracking loads (14.7 % and 5.9% respectively). Experimental results also 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. The addition of steel fibers with concrete containing GP improved the performance, toughness, and stiffness of RC slabs. The load-deflection curves, load-steel strain relationships, stiffness, ductility, and toughness are plotted and calculated. Finally, a comparison between the results of the experiment and the provisions of different design codes was performed. |
