Uticaj sadržaja amorfne faze na veličinu ispoljavanja fenomena vlažnog širenja kod opekarskih proizvoda

Abstract

Uticaj mineraloškog sastava na veličinu vlažnog širenja opekarskih sirovina razmatran je na primeru dve opekarske sirovine, jedne sa većim sadržajem zemnoalkalnih karbonata i druge sa manjim sadržajem zemnoalkalnih karbonata. Veličina vlažnog širenja je određena na laboratorijskim uzorcima opeka pečenih u temperaturnom intervalu od 950°C do 1050°C, neposredno po završenom pečenju i nakon hidrotermalnog tretmana u autoklavu. Utvrđeno je da veličina vlažnog širenja zavisi od prisustva ili odsustva zemnoalkalnih karbonata, temperature pečenja i pojave staklaste faze. Opekarska glina sa niskim sadržajem zemnoalkalnih karbonata u pečenom stanju pokazuju manju tendenciju ka vlažnom širenju i obrnuto. .

The influence of mineralogical composition of brick raw materials was considered on example of two brick raw materials out of which one was with greater content of earth-alkaline carbonates, while the other with smaller content of earth-alkaline carbonates. Magnitude of moisture expansion was determined in laboratory samples of bricks which were fired at a temperature range of 950°C do 1050°C, immediately upon completion of firing and upon hydrothermal treatment in autoclaves. It was found that the magnitude of moisture expansion depended on the presence or absence of earth-alkaline carbonates, firing temperature and amorphous - glassy phase. The fired brick clay with low content of earth-alkaline carbonates showed lower tendency to moisture expansion, and vice versa. .