Resumo

CABRERA LUNA, K.; ESCALANTE GARCIA, J. I.; NIEVES MENDOZA, D.  e  MALDONADO BANDALA, E. E.. Compressive strength and microstructure of concretes manufactured with supersulfated cement based on materials of volcanic origin exposed to a sulfate environment. Rev. ALCONPAT [online]. 2019, vol.9, n.1, pp.106-116.  Epub 29-Set-2020. ISSN 2007-6835.  https://doi.org/10.21041/ra.v9i1.374.

This paper presents the results of concretes manufactured with supersulfated cement (SSC) based on volcanic materials. The concretes were cured under two regimes, one for 24 h at 25 °C and another for 22 h at 60 °C and then at 25 °C. The specimens were exposed to two conditions: dry laboratory conditions and immersed in a solution with 3.5% CaSO4 at 25 °C for up to 180 days. After 180 days, the concrete with a cementitious compound of 5%An-10%PC-10%CaO-75%PM reached a compressive strength of 46 MPa exposed to CaSO4 solution and of 44 MPa in dry laboratory conditions. The microstructure was analyzed by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction, which showed that the main hydration products are C-S-H and ettringite.

Palavras-chave : supersulfated concrete; pumice; compressive strength; sulfate environment.

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