Apart from portland cement, concrete might comprise other cementitious materials which includes fly ash, a squander byproduct from coal burning electric powered power vegetation; floor slag, a byproduct of iron and steel production; and silica fume, a waste byproduct from the manufacture of silicon or ferro-silicon metallic. Some cementitious resources https://judobelt91357.blogdigy.com/not-known-details-about-concrete-reinforced-house-54211771