Abstract
Some occurrences of massive volcanic glass have been recorded in the western region of Sao Paulo State during geological mapping and prospecting and technological characterization of pozzolanic materials. The massive volcanic glass is associated with trachydacites from the Serra Geral Formation. The geometry of these layers has not been determined yet because they are covered by sediments. These rocks were identified as natural pozzolans because their active component, volcanic glass, reacted with lime forming a calcium silicate. The technological properties of the cement produced using such pozzolans were improved. Furthermore, the use of pozzolans reduces carbon dioxide emission and limestone extraction since pozzolans replace part of the portland clinker in the final product. This paper presents results of some studies on massive volcanic glass as an active component of pozzolans. In addition to that, this paper discusses the importance of this finding for construction industry and the great potential of pozzolanic materials, due to the considerable size of Serra Geral Formation in Brazil.
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