Comparison of the microstructure and the compressive strength of two geopolymers derived from Metakaolin and an industrial sludge

•The calcined industrial sludge (MIS) can be used to produce a geopolymer cement.•The MIS based geopolymer compressive strength reaches 49.4MPa.•The MIS behavior vis-a-vis the activator solution is similar to that of Metakaolin. The aim of this study is to find out the degree of resemblance between...

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Bibliographic Details
Published in:Construction & building materials 2017-08, Vol.146, p.621-629
Main Authors: Belmokhtar, Noureddine, Ammari, Mohammed, Brigui, Jamal, Ben allal, Laïla
Format: Article
Language:English
Subjects:
Activated material
Ceramic industry sludge
Ceramics
FTIR
Geoploymer
Metakaolin
Na2O/Al2O3
Polymers
Properties
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Summary:•The calcined industrial sludge (MIS) can be used to produce a geopolymer cement.•The MIS based geopolymer compressive strength reaches 49.4MPa.•The MIS behavior vis-a-vis the activator solution is similar to that of Metakaolin. The aim of this study is to find out the degree of resemblance between the microstructure of a ceramic industry sludge based geopolymer and Metakaolin based geopolymer, in order to use this type of industrial sludge in some applications as a raw material instead of Metakaolin. The studied sludge is collected from a local industry manufacturing sanitary ceramic products. It 's generated during the treatment of its industrial wastewater. The structural change of geopolymer products is followed by FTIR spectroscopy, XRD and TEM analysis. Compressive strength of geopolymer specimens, prepared from the two raw materials, depends on the Na2O/Al2O3 molar ratio. XRD analysis of calcined industrial sludge based-geopolymer and Metakaolin based-geopolymer, confirms the amorphous nature of the new formed phase. TEM micrographs of two kinds of raw materials based-geopolymer reveal one type of reacted region. Infrared spectroscopy shows that the behavior of the calcined industrial sludge vis-a-vis the sodium silicate solution is similar to that of Metakaolin.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2017.04.127