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TitleInvestigations of geopolymeric mixtures based on phosphate washing waste
Author(s)Dabbebi, R.
Baklouti, S.
Aguiar, J. L. Barroso de
Pacheco-Torgal, F.
Samet, B.
Phosphate washing waste
Sodium hydroxide
Sodium silicate
Issue dateDec-2018
JournalScience and Technology of Materials
CitationDabbebi R., s. Baklouti, Aguiar J. B., Pacheco-Torgal F., Samet B. Investigations of geopolymeric mixtures based on phosphate washing waste, Science and Technology of Materials, Vol. 30, pp. 1-5, doi:10.1016/j.stmat.2018.08.001, 2018
Abstract(s)The extraction of the phosphate ore produces a high amount of waste causing serious environmental problems. This waste, termed as phosphate washing waste, was filtered and dried at 105 °C for 24 h to remove the water. The dried waste was milled and then sieved in a 100 ?m sieve. The resulting phosphates washing waste (PWW) particles size are below 70 ?m. The phosphate washing waste was calcined at 700 °C and 900 °C. Both calcined and uncalcined waste were investigated with X-ray fluorescence (XRF), X-ray powder diffraction (DRX), Fourier transform infrared (FTIR), simultaneous differential thermal and thermogravimetric analyses (DTA-TG) and particle size analysis. This waste was activated with sodium hydroxide (NaOH) and sodium silicate in order to produce geopolymeric materials. The influence of replacing PWW by 15% of metakaolin was also study. The results show that the highest compressive strength is obtained with metakaolin. The results also showed that compressive strength decreased with the increase of NaOH concentration.
Publisher version
AccessOpen access
Appears in Collections:C-TAC - Artigos em Revistas Internacionais

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