The Use of Calcium Carbonate as a Foaming Agent of Glass Waste for Unconventional Manufacture of a Light Glass Foam with Adequate Mechanical Strength
Year: 2022
Type: article
Abstract: 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% CaCO3 and 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).
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4318246779