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Title: Towards preparation conditions for the synthesis of alkali-activated binders using tungsten mining waste
Authors: Kastiukas, G
Zhou, X
Castro-Gomes, J
Keywords: Alkali-activated binder;Binary blend;Curing temperature;Geopolymer;Material preparation;Mixing time;Precursor reactivity;Synthesis conditions;Tungsten mining waste;Waste glass
Issue Date: 2017
Publisher: American Society of Civil Engineers
Citation: Journal of Materials in Civil Engineering, (2017)
Abstract: This study evaluated the results of preparation conditions for the production of an alkali-activated binder (AAB) based on a binary mixture of tailings from tungsten mine waste (TMW), and waste glass (WG) activated with a mixture of sodium silicate (SS) and sodium hydroxide (SH). 40 wt.% WG increased the amorphous nature of the binary blend by 21% without initiating the alkali-silica reaction. SS/SH activator solution was subjected to a variation of mixing times, and its sensitivity was measured using temperature monitoring, and Fourier Transforms Infrared Spectroscopy (FTIR). After 20 minutes of mixing, the SS/SH activator solution showed a 3.13°C reduction in temperature, a 21.4% increase in unbound water content and as a result imparted a 26% drop in the mechanical resistance of TMW-WG AAB at 28-days. The TMW-WG AAB was also determined to develop the highest compressive strength when cured at 80°C for 24h in sealed conditions. The following conditions, supported by X-ray diffraction (XRD) and Fourier transforms infrared analysis (FTIR), are responsible for the most significant dissolution of the alumino-silicate oxides.
ISSN: 1943-5533
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Research Papers

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