Massive volcanic glass: natural pozzolan in the West of São Paulo State

Authors

  • Tarcísio José Montanheiro Secretaria do Meio Ambiente do Estado de São Paulo; Instituto Geológico
  • Francisco de Assis Negri Secretaria do Meio Ambiente do Estado de São Paulo; Instituto Geológico
  • Valdecir de Assis Janasi Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Jorge Kazuo Yamamoto Universidade de São Paulo; Instituto de Geociências; Departamento de Geologia Sedimentar e Ambiental
  • Fabiana Pereira Vogado Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica

DOI:

https://doi.org/10.5327/Z1519-874X2011000100004

Keywords:

Volcanic glass, Serra Geral Formation, Pozzolan, Portland cement with additions

Abstract

Some occurrences of massive volcanic glass have been recorded in the western region of São 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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Published

2011-04-01

Issue

Vol. 11 No. 1 (2011)

Section

Articles

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How to Cite

Montanheiro, T. J., Negri, F. de A., Janasi, V. de A., Yamamoto, J. K., & Vogado, F. P. (2011). Massive volcanic glass: natural pozzolan in the West of São Paulo State . Geologia USP. Série Científica, 11(1), 59-74. https://doi.org/10.5327/Z1519-874X2011000100004