| Popis: |
The paper presents experimental results of manufacturing a glass foam of glass waste with excellent thermal insulation properties and simultaneously relatively high compressive strength. The foaming agent was calcium carbonate (CaCO3) and borax was used as a fluxing agent. The achievement of the objective involved finding an appropriate correlation between the foaming agent and the fluxing agent to obtain the desired characteristics. The research originality was the use of the own technique of predominantly direct microwave heating that ensures a high energy efficiency of the thermal process. The optimal foam sample was made with 1.1% CaCO3and 2% borax, by the heat treatment of glass waste at 825ºC. The foamed product characteristics were: apparent density of 0.18 g/cm3, porosity of 91%, thermal conductivity of 0.042 W/m·K and compressive strength of 2.6 MPa. The high energy efficiency of the heating technique led to a very low specific energy consumption (0.67 kWh/kg). |
