Studies on changes in microstructure and thermal conductivity of cement mortar blended with refractory chemical at elevated temperature

摘要

The present study explores the influence of zirconium dioxide as refractory material in blended cements. Zirconium dioxide has been replaced by 2% and 4% by mass in fly ash blended cements. Mortar cube specimens were prepared and exposed to different level of temperature up to 800℃ for 2 hours and 4 hours, after 28 days curing. The specimens were tested for compressive strength after air cooling and were found to retain compressive strength. Microstructural studies were carried out through X-ray diffraction and SEM analysis. It was found that Gismondine and Afwillite formed at higher temperatures had influence on cement mortar.