2021
DOI: 10.1016/j.cemconres.2021.106516
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Understanding the microstructural evolution of hypersaline cemented paste backfill with low-field NMR relaxation

Abstract: Cemented paste backfill (CPB) comprising mineral tailings, binders and mixing waters is an important potential support material in the mining industry. As the mechanical properties of CPB are significantly influenced by its microstructural characteristics the development of measurement tools to better understand its pore structure evolution is important for its increased utilisation. This study reports the application of low-field nuclear magnetic resonance (NMR) relaxation time measurements to characterise th… Show more

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Cited by 56 publications
(15 citation statements)
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“…Mine tailings were sourced from the Frog’s Leg Gold Mine in Western Australia. The tailings were first sieved to separate any coagulated particles and then dried in air at 110 °C for at least 24 h, with the resultant material exhibiting a mean particle size of 60 μm (volume-based diameter); a tailings’ particle size distribution is available elsewhere . The binder used in this work comprised a mixture of OPC and commercially available slag (sourced from BGC Cement Pty Ltd, Australia) mixed in a 1:2 ratio by mass.…”
Section: Methodsmentioning
confidence: 99%
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“…Mine tailings were sourced from the Frog’s Leg Gold Mine in Western Australia. The tailings were first sieved to separate any coagulated particles and then dried in air at 110 °C for at least 24 h, with the resultant material exhibiting a mean particle size of 60 μm (volume-based diameter); a tailings’ particle size distribution is available elsewhere . The binder used in this work comprised a mixture of OPC and commercially available slag (sourced from BGC Cement Pty Ltd, Australia) mixed in a 1:2 ratio by mass.…”
Section: Methodsmentioning
confidence: 99%
“…Chemical analysis of these two mixing waters was performed via a combination of inductively coupled plasma optical emission spectroscopy (ICP-OES) and anion chromatography; ICP-OES was conducted using an Optima 5300 DV ICP-OES, while anion chromatography tests were performed using a Thermo Scientific Dionex IonPac AS23 instrument. The resulting water compositions are presented in Table . Mineralogical analysis of the tailings is detailed elsewhere; importantly for our purposes, these tailings were found to comprise approximately 3 wt % Fe 2 O 3 .…”
Section: Methodsmentioning
confidence: 99%
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“…Tailings, binder, and water were the main components of the CTB material [ 7 ]. After the mixing process, the CTB slurry was pumped into mine stopes through pipelines and cured for strength development during the hardening process [ 8 ]. During the service life of a CTB structure, it was important for the structure to have an acceptable mechanical strength to provide a stable support for the roof.…”
Section: Introductionmentioning
confidence: 99%