MARCIA PIRES DE CAMPOS

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High strength phosphogypsum and its use as a building material
2007 - KANNO, WELLINGTON M.; ROSSETTO, HEBERT L.; SOUZA, MILTON F. de; MADUAR, MARCELO F.; CAMPOS, MARCIA P. de; MAZZILLI, BARBARA P.
A new process (patent applied) that works equally well with both plaster of mineral gypsum and phosphogypsum for the preparation of gypsum components, UCOS, has been developed. The process consists of the following steps: humidification of plaster by fine water droplets, uni-axial compression, hydration reaction and drying. Strong hydrogen bonds develop among the crystals together with adhesion provided by confined water that accounts for nearly 70% of the adhesion forces. By reducing the plaster to water ratio to close the minimum necessary, new features are generated. An experimental house has been constructed, in which walls and ceilings have been built of gypsum and phosphogypsum. Since phosphogypsum potentially contain radioactive elements, the application of an activity concentration index to the phosphogypsum employed in the building was carried out.
Radiological impact of the application of phosphogypsum in civil construction: an overview of Brazilian studies
2013 - CAMPOS, MARCIA P.; NISTI, MARCELO B.; MADUAR, MARCELO F.; MAZZILLI, BARBARA