Pore-forming additives in glass-clay composition

Abstract

The aim of the present research was to evaluate the influence of pore-forming additives on the composition of glass ceramics from glass waste with a gasifier, which allows production of lightweight materials with minimum weight. Gasifiers used in the research were charcoal, anthracite and soot. All samples were made from a composition consisting of glass, clay and a gasifier. Compression, water absorption tests, volume expansion measurements and SEM for the best test sample have been performed for the specimen with different compositions. Overall glass waste was used in an amount from 83.00% to 90.32%, clay from 9.158% to 12.00% and the gasifier from 0.179% to 5.00% of the total amount of the composition with 10.00% of water amount of total composition weight. The range of the temperature used to perform the evaluation was from 800 °C to 900 °C. The time span for heating in an oven was in the range of 60 to 120 minutes. The best results received from all samples were with the glass-clay composition with soot as a gasifier. The range of results received for volume weight was from 232.13 kg·m-3 to 472.48 kg·m-3, compression strength from 0.45 MPa to 0.77 MPa, and volume expansion from 3.04 to 4.18 times. The water absorption results have been received with a high percentage and a conclusion about that amount. A conclusion about the factors influencing the pore-forming using different gasifiers has been made. A conclusion about the crystallisation phase in the production of samples has been made by evaluating SEM results.