In addition to portland cement, concrete may possibly have other cementitious resources which include fly ash, a waste byproduct from coal burning electric powered electric power crops; floor slag, a byproduct of iron and steel manufacturing; and silica fume, a squander byproduct through the manufacture of silicon or ferro-silicon metal. https://damienxtmfw.blogdomago.com/34627069/an-unbiased-view-of-reinforced-concrete-meaning