How to Make Refractory Concret By MarcSculpteur in DesignArt1,31662Introduction: How to Make Refractory Concret By MarcSculpteurYoutube CHANNEL ! Subscribe ..Follow More by the author: About: French art sculptor / Artist & Youtuber More About MarcSculpteur »Refractory concret can be done mixing ciment with pozzolan. The mix is used for kiln or fondery.