Investigating the characteristics of cement mortar comprising nano-silica additives Available to Purchase

Construction building materials is considered the superlative environment for reutilizing waste materials. Thus, the choice of sustainable powders classifies a vital method to design a new characteristic for construction materials. The present research focus on the impact of using nano silica additives, at three contents (2, 4, 6) % by the cement weight. Important properties as, direct tensile strengths besides compressive strengths were studied at 7 and 28 ages. In general, the results exhibited the optimistic influences of used nano-silica on fresh and mechanical characteristics. The compressive strength of mortar comprising (2, 4, 6) % of nano silica improved to (20, 43.6, 59) % at 28 day respectively. As well, tensile strength enhanced by percentages of (17.5, 35, 43.3) % at 28 days respectively compared to unmodified cement mortar. The dry density of cement mortar contained nano silica increased (0.5, 0.86, 1.5) % at 28 day aged with the adding of nano-silica content respectively. While the porosity and water absorption percent were decreased with addition of nano-silica content of (11.16, 17.4, 22.85) and (12.83, 19.36, 27.25) % at 28 day respectively as compared to unmodified cement mortar.