Comprehensive Study of the Effect of Hematite-Rich Sludge from Water Treatment Station on the Physical Properties of Metakaolin-Based Geopolymer Cements — Oak Academic Publishing
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Comprehensive Study of the Effect of Hematite-Rich Sludge from Water Treatment Station on the Physical Properties of Metakaolin-Based Geopolymer Cements
Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
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Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
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School of Geology and Mining Engineering, University of Ngaoundéré, Meiganga, Cameroon
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Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
,
Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
,
Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
,
Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
,
Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
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Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
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Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
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Unité Mixte de Recherche 7315, Institut de Recherche sur les Céramiques, Centre National de la Recherche Scientifique, University of Limoges, Limoges, France
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Department of Chemistry, University Gamal Abdel Nasser of Conakry, Conakry, Guinea
1 Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
2 Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
3 School of Geology and Mining Engineering, University of Ngaoundéré, Meiganga, Cameroon
4 Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
5 Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
6 Department of Chemistry, University Julius Nyerere of Kankan, Kankan, Guinea
7 Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
8 Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
9 Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
10 Department of Inorganic Chemistry, University of Yaoundé I, Yaoundé, Cameroon
11 Unité Mixte de Recherche 7315, Institut de Recherche sur les Céramiques, Centre National de la Recherche Scientifique, University of Limoges, Limoges, France
12 Department of Chemistry, University Gamal Abdel Nasser of Conakry, Conakry, Guinea
This work aimed to study the effect of WTHs (Water treatment hematite-rich sludge) additives on the properties of geopolymers cement. Three formulations of geopolymer cement based on metakaolin powder substituted with 0, 5 and 10 wt.% of WTHs were investigated and the obtained pastes were characterized after curing times varying from 7 to 28 days. X-ray diffraction (XRD) and FT-IR patterns of metakaolin and WTHs dry powders indicate that they were in the amorphous states with illite, lepidocrocite and quartz in low concentrations in metakaolin and mainly hematite in the sludge. The pastes demonstrated an accelerating effect of the WTHs. The specimens showed weak linear shrinkage that increased slightly with sludge additive (from 0.5% to 1.7%). Improved apparent density was obtained with increasing WTHs contents (1.83 to 1.97 g/cm 3 ). The Porosity was improved for 5% WTHs (67% to 77%) with a slight drop for 10%. The optical microstructure exhibits pores interconnectivity with appearance of some macropores favoured by WTHs additives that promoted a three-dimensional porous structure. The products exhibited a compressive strength of 14 MPa on day 28 and could be used as structural and porous materials required for thermal and acoustic isolation.
KeywordsGeopolymer CementsHematite-Rich SludgePorosityLinear ShrinkageApparent Density
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