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Properties of geopolymer binders prepared from milled pond ash
Alkali-activated materials were prepared from pond ash from the Darkhan city (Mongolia) thermal power station. This ash contains about 60 wt % X-ray amorphous material in addition to quartz, mullite, hematite and magnesioferrite, and presents significant storage problems since it is accumulating in large amounts and is a hazardous waste, containing 90-100 ppm of the heavy metals As, Pb and Cr, and about 800 ppm Sr. Alkali-activated materials synthesized from the as-received pond ash achieved compressive strengths of only 3.25 MPa. Reduction of the particle size by mechanical milling for up to 30 min progressively increases the compressive strength of the resulting alkali-activated geopolymer up to 15.4 MPa. Leaching tests indicate that the combination of milling and alkali treatment does not cause the release of the hazardous heavy metals from the product, making it suitable for construction applications. © 2017 CSIC.
Properties of geopolymer binders prepared from milled pond ash
Alkali-activated materials were prepared from pond ash from the Darkhan city (Mongolia) thermal power station. This ash contains about 60 wt % X-ray amorphous material in addition to quartz, mullite, hematite and magnesioferrite, and presents significant storage problems since it is accumulating in large amounts and is a hazardous waste, containing 90-100 ppm of the heavy metals As, Pb and Cr, and about 800 ppm Sr. Alkali-activated materials synthesized from the as-received pond ash achieved compressive strengths of only 3.25 MPa. Reduction of the particle size by mechanical milling for up to 30 min progressively increases the compressive strength of the resulting alkali-activated geopolymer up to 15.4 MPa. Leaching tests indicate that the combination of milling and alkali treatment does not cause the release of the hazardous heavy metals from the product, making it suitable for construction applications. © 2017 CSIC.
Properties of geopolymer binders prepared from milled pond ash
Temuujin, J. (author) / Minjigmaa, A. (author) / Bayarzul, U. (author) / Kim, D.S. (author) / Lee, S.-H. (author) / Lee, H.J. (author) / Ruescher, C.H. (author) / MacKenzie, K.J.D. (author)
2017-01-01
Materiales de Construccion 67 (2017), Nr. 328
Article (Journal)
Electronic Resource
English
Construction applications , Grinding , Amorphous materials , Thermoelectric power plants , Geopolymer binders , Silicate minerals , Compressive strength , Microstructure , Alkali activated cements , Thermal power stations , Pond ash , Inorganic polymers , Mechanical milling , Heavy metals , Alkali-activated cement , Grinding (machining) , Hazards , Mechanical alloying , Hazardous wastes , ddc:690 , Milling (machining) , Lead , Hazardous heavy metals , Particle size , Lakes , Geopolymers , Binders
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