چكيده به لاتين
In the present study, the effects of a Nano-composite on the mechanical, durability and transfer properties of mortars containing Zeolite and Pumice is discussed. This Nano-composite is obtained by the sedimentation of Nano-SiO2 (NS) particles of Tetraortho silicate (TEOS) hydrolysis on Graphene oxide (GO) Nano-sheets. The NS&GO Nano-composite properties were investigated by Ultraviolet–visible spectroscopy (UV-Vis), Energy-dispersive X-ray spectroscopy (EDS), Transmission Electron Microscopy (TEM) and Map analysis, all of which indicate a better distribution of NS in the presence of GO. Also, 12 mortars mixed designs were considered to compare the single and hybrid effects of NS and GO. Following the mechanical evaluation of mortars, compressive and tensile strength were measured at 7, 28 and 90 days of age. The calculation Length Change of Mortars, Scanning Electron Microscopy (SEM) and quantitative and qualitative analysis of X-ray diffraction (XRD) after 24 weeks, exposure to a solution containing 5% Sodium sulfate were considered. The resistance to chloride ion penetration was evaluated by rapid chloride migration (RCM) test and helium gas porosity. Over the control design of 28 days, ZNS&GO mortar that contained 0.02% GO, 0.5% SiO2 and 15% zeolite (by mass of cement) had the best results in compressive and tensile strength with 34.0% and 68.0% improvements, respectively. Also, compared to the control mortar, after 90 days, the chloride migration coefficient and helium gas porosimeter results was improved by 67.0% and 53.8%, respectively. In addition, the performance of ZNS&GO mortar against sulfate attack in terms of Ettringite reduction percentage was evaluated acceptable. Using mortars containing Nano-particles and natural pozzolans can greatly reduce corrosion in concrete. Additionally, Nano hybrid materials through nucleation and natural pozzolans through pozzolanic properties improved the mechanical and transfer properties of mortars.
