Microstructure and strength properties of mortar containing waste ceramic nanoparticles

Abstract

This study investigated the effects of waste ceramic powder on both the mechanical and microstructural properties of mortar. The study explored the utilization of Al2O3–SiO2 nanoparticles in mortar as cement replacement. Four mixes containing ceramic nanoparticles (0, 20, 40, and 60%) were prepared. The mortar specimens were tested for compressive strength. The role of ceramic waste powder was investigated through the analysis of microstructure in terms of scanning electron microscopy, X-ray diffraction, thermogravimetric analysis, and differential thermal analysis. The results revealed that the replacement of Al2O3–SiO2 nanoparticles to the mortar matrix had significantly enhanced the compressive strength. At 90 days, the compressive strength was in the range of 44.7–58.8 MPa. The results were validated through a microstructure test. The mortar with 40% of ceramic replacement showed better performance in terms of C-S-H production from active siliceous containing excessive calcium hydroxide content.