Besides portland cement, concrete might include other cementitious components which include fly ash, a waste byproduct from coal burning electrical electricity crops; floor slag, a byproduct of iron and steel producing; and silica fume, a waste byproduct in the manufacture of silicon or ferro-silicon metallic. Some cementitious materials are similar https://franciscodzskb.blogrelation.com/42077063/the-best-side-of-concrete-reinforced-stone