Experimental investigation on the influence of partially stabilised nano-ZrO2 on the properties of prepared clay-based refractory mortar

Abstract Buildings subjected to elevated temperatures or thermal shock can be exposed to many changes in their properties, such as phase transformation and weight loss; therefore, the thermomechanical stability of mortars is essential to maintain their properties. In this work, different ratios of partially stabilised nano-zirconium oxide (ZrO2) were used as a partial replacement by weight of kaolin to prepare a refractory mortar. Five ratios (5, 7.5, 10, 12.5, and 15%) of ZrO2, as well as unfired kaolin, water, and internal lubricant (potassium silicate) were applied to increase the specimen’s cohesion. The results showed that ZrO2 additives are suitable to be used for the production of refractory mortar as a result of increased physical and mechanical strength.