EFFECTS OF ELEVATED TEMPERATURE AND RE-CURING ON THE PROPERTIES OF MORTARS CONTAINING INDUSTRIAL WASTE MATERIALS

Behavior of mortars with and without silica fume (SF), containing green ceramic powder (GCP) and marble dust (MD) under the conditions of pre-fire and post-fire was investigated. In addition, influence of re-curing on the mechanical properties and permeability of fire-damaged high-strength mortars was studied. For this purpose, mortars subjected to 800 °C were water-cured for 7 days after air-cooling. In order to determine the physical, mechanical and permeability properties of mortars, the bulk density, water absorption, porosity, flexural and compressive strength, capillary water absorption tests were conducted and optical microscope analyses were also performed. Results showed that mortars with MD had the highest strength values and the lowest permeability for normal and post-fire conditions, however, mortars with GCP showed the best performance among other mortars after re-curing. This can be attributed to the siliceous composition of GCP regarding the vulnerability at high temperature and suitability in C-S-H re-formation when re-curing. Water-curing contributed to re-hydration and self healing, resulting in strength re-gain and porosity recovery which was also observed by microstructural evaluation.