Preparation of geopolymer-type mortar and "light-weight concrete" from copper floatation waste and coal combustion by products

verfasst von

J. Temuujin, A. Minjigmaa, B. Davaabal, T. Zolzaya, U. Bayarzul, T. Jadambaa, C. H. Rüscher

Abstract

To utilize the waste of the Erdenet (Mongolia) copper plant and mitigate the dust hazard, too, the waste was investigated together with ashes from Mongolian coal combustion power stations for the possibility of producing civil building materials. The ashes concern Banganuur fly ash (BFA) of the 4th thermal power station of Ulaanbaatar City, and pond ashes of the 3rd thermal power station of Ulannbaatar City (PA_UB) and Darkhan City (PA_D). Ashes and Erdenet floatation waste (EFW) were characterized with XRF, granulometry, XRD, SEM and gamma-ray spectroscopy. The radium equivalent activity of EFW, BFA and PA_D are below the value permitted for civil building materials (370 Bq/kg). It could be shown that the coal combustion by-products alone could be alkali activated revealing binders of suitable 7 days compressive strength (in MPa) of about 30 (4.25), 8.25 (1.25), 3.24 (0.5) for BFA, PA_UB, PA_D, respectively. The EFW could be used as a full substitution of construction sand. For example the 7-day compressive strength of alkali-activated mortar containing 70% BFA and 30% EFW was 22.0 (4.69) MPa, while for the corresponding mortar prepared with construction sand it was 21.2 (5.5) MPa. So called "light-weight concrete" were prepared in a special way using an in-situ hydrogen release reaction with the addition of Al. Series were prepared with EFW as referenced to series with construction sand using alkali activated PAd as the binder. The results show systematic trends with compressive strength typically between 1 and 3 MPa.

Organisationseinheit(en)

Institut für Mineralogie

Externe Organisation(en)

Mongolian Academy of Sciences
Mongolian University of Science and Technology

Typ

Aufsatz in Konferenzband

Seiten

89-101

Anzahl der Seiten

13

Publikationsdatum

28.12.2015

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Keramische und Verbundwerkstoffe, Werkstoffchemie

Ziele für nachhaltige Entwicklung

SDG 11 – Nachhaltige Städte und Gemeinschaften

Elektronische Version(en)

https://doi.org/10.1002/9781119211747.ch8 (Zugang: Geschlossen)