NEUTRALIZAÇÃO DO FOSFOGESSO COM CAL E A SUA INFLUÊNCIA NA HIDRATAÇÃO E NO DESEMPENHO MECÂNICO DE MATRIZES CIMENTÍCIAS

Authors

  • José S. ANDRADE NETO Universidade Federal do Rio Grande do Sul (UFRGS)
  • Jéssica D. BERSCH Universidade Federal do Rio Grande do Sul (UFRGS)
  • Thaís S. M. SILVA Universidade Federal do Rio Grande do Sul (UFRGS)
  • Erich D. RODRÍGUEZ Universidade Federal de Santa Maria (UFSM)
  • Seiiti SUZUKI INTERCEMENT
  • Ana Paula KIRCHHEIM Universidade Federal do Rio Grande do Sul (UFRGS)

Keywords:

Phosphogypsum, Neutralization, Portland cement, Hydration

Abstract

Phosphogypsum has the potential to be used as setting retarder for Portland cement, however P2O5 and F- in its composition delay cement hydration and reduce the mechanical performance of the matrix in the early ages. The objective of this study was to evaluate a simple process of neutralization (removal of impurities) of phosphogypsum through the mixture with hydrated lime. Cements were made with gypsum, phosphogypsum, and neutralized phosphogypsum. ICP-OES, isothermal calorimetry, and compressive strength tests were performed. It was observed that neutralization with lime reduced the concentration of impurities, reducing the delay in hydration and increasing the initial mechanical strengths.

Published

2023-08-10

How to Cite

ANDRADE NETO, J. S., BERSCH, J. D., SILVA, T. S. M., RODRÍGUEZ, E. D., SUZUKI, S., & KIRCHHEIM, A. P. . (2023). NEUTRALIZAÇÃO DO FOSFOGESSO COM CAL E A SUA INFLUÊNCIA NA HIDRATAÇÃO E NO DESEMPENHO MECÂNICO DE MATRIZES CIMENTÍCIAS. ENCONTRO NACIONAL DE APROVEITAMENTO DE RESÍDUOS NA CONSTRUÇÃO, 7(1), 58–65. Retrieved from https://eventos.antac.org.br/index.php/enarc/article/view/3304

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