Optimization of geopolymer mortar incorporating heavy metals in producing dense hybrid composites

The aim of this study is to examine capability of geopolymer in immobilization and entrapping of heavy metals bearing materials; also, dose optimization that will be more efficiently affect the resultant geopolymer structure will be studied. The main binder used for mortar preparation was water cool...

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Veröffentlicht in:Journal of Building Engineering 2020-11, Vol.32, p.101684, Article 101684
Hauptverfasser: Khater, H.M., Ghareib, Mahmoud
Format: Artikel
Sprache:eng
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Zusammenfassung:The aim of this study is to examine capability of geopolymer in immobilization and entrapping of heavy metals bearing materials; also, dose optimization that will be more efficiently affect the resultant geopolymer structure will be studied. The main binder used for mortar preparation was water cooled slag in addition to air cooed slag as fine aggregate passing sieve of one mm in equal ratio, whereas the used activator was 8 % wt sodium hydroxide. The studied heavy metals bearing materials were barium sulfate, lead phosphate, lead slag and electric arc furnace dust used as partial replacement of water-cooled slag. Physico-mechanical characterization of each set of samples was conducted using XRD, FT-IR, SEM, compressive strength and bulk density. Results demonstrated that barium sulfate can be efficiently used up to 2%, lead phosphate up to 1%, lead slag up to 5%, and electric arc furnace dust up to 10%. •Examine the capability of geopolymer in immobilization of heavy metals bearing materials.•Incorporation of BaSO4 and Pb3(PO4)2 leads to an enhancement in the produced geopolymer mortar.•Lead slag results in decreasing physico-mechanical properties of the produced mortar.•Electric arc furnace dust results in an enhancement up to 10% in the produced mortar.•Immobilizations efficiency varied depending on the nature and dose of the used heavy metals.
ISSN:2352-7102
2352-7102
DOI:10.1016/j.jobe.2020.101684