*Production of Sustainable Concrete by Using Challenging Environmentally Friendly Materials… DOI: http://dx.doi.org/10.5772/intechopen.99239*

fine powder formed by the external skeletons of these unicellular beings is extremely rich in silica, has high porosity and surface areas. It is usually commercialized after it has been subjected to the previous calcination to remove organic matter and its characteristics make it liable to be replacement materials of cement. Its application in concrete production is usually in a weight percentage of 10–20% over the cement binder weight.
