Morteza Chekani Azar - Student of the Bachelor degree of Azad University of Maragheh, member of scientific association of civil engineering
Iraj Sedghivash - Student of the Bachelor degree of Azad University of Maragheh, member of scientific association of civil engineering
Amin Hesami - Student of the Bachelor degree of Azad University of Maragheh, member of scientific association of civil engineering

By ever-increasing of concrete structures, identifying pozzolans that improves mechanical properties of concrete is in high importance. Thus, performing wide investigational projects on different concrete constituents in recent years caused appearance of concretes which not only provides resistance, but other properties such as durability, impermeability, efficiency, and durability against factors like fire, has make basic changes on it role and application. In this paper, after brief explanation of concrete, we have description on history of pozzolanic materials, usage of overplus materials, such as microsilica, animal manure, etc, cause environmental pollutions. Also, chemical andphysical characteristics of nanosilica and microsilica, and definition on slag types and fly ash has been mentioned

pozzolans, concrete, microsilica, animal manure ash