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http://bura.brunel.ac.uk/handle/2438/14419
Title: | 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) 29 (10): pp. 04017181-1 - 04017181-9 (9) |
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). A 40% by weight WG increased the amorphous nature of the binary blend by 21% without initiating the alkali-silica reaction. The SS-SH activator solution was subjected to a variation of mixing times, and its sensitivity was measured using temperature monitoring and Fourier transform infrared spectroscopy (FTIR). After 20 min of mixing, the SS-SH activator solution showed a 3.13°C reduction in temperature and a 21.4% increase in unbound water content, and as a result imparted a 26% drop in the mechanical strength 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 24 h in sealed conditions. The following conditions, supported by X-ray diffraction (XRD) and FTIR, are responsible for the most significant dissolution of the aluminosilicate oxides. |
URI: | https://bura.brunel.ac.uk/handle/2438/14419 https://ascelibrary.org/doi/10.1061/%28ASCE%29MT.1943-5533.0002029 |
DOI: | https://doi.org/10.1061/(ASCE)MT.1943-5533.0002029 |
ISSN: | 0899-1561 |
Appears in Collections: | Dept of Mechanical and Aerospace Engineering Research Papers |
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