Besides portland cement, concrete might comprise other cementitious materials such as fly ash, a waste byproduct from coal burning electric powered electrical power plants; ground 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 materials https://todaybookmarks.com/story19892858/the-best-side-of-concrete-reinforced-stone