Study of physico-chemical and mechanical characteristics of consolidated and unconsolidated cemented paste backfills

Yilmaz Erol (), Belem Tikou and Benzaazoua Mostafa
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Benzaazoua Mostafa: Department of Applied Sciences, University of Québec at Abitibi-Temiscamingue (UQAT), Québec, Canada

Gospodarka Surowcami Mineralnymi / Mineral Resources Management, 2013, vol. 29, issue 1, 81-100

Abstract: In recent years, it has been observed that the performance and quality of in situ cemented paste backfill (CPB) samples are constantly lower than samples obtained from the same CPB mix poured into laboratory-prepared plastic moulds. This could be well explained by the absence of an efficient laboratory tool capable of mimicking CPB’s in situ placement, hardening, and curing conditions relating to stope size and geometry. To meet this need, a new laboratory tool named CUAPS (curing under applied pressure system) was manufactured and used to examine the effect of curing under effective stress on physico-chemical and mechanical properties of CPB, along with plastic mould samples. A comparative study was conducted for both CUAPS and mould samples containing a binder content of 3, 4.5, and 7 wt% after curing times of 7, 14, and 28 days. Results indicate that the performance of CUAPS-consolidated samples are always more realistic than those of plastic mould-unconsolidated samples mainly due to water drainage induced by consolidation. CUAPS has witnessed an advantageous effect on CPB hardening which includes the amount of bleeding water (separation of water from the fresh backfill material) and a combination of drainage of part of the mixing water and the settlement of paste backfill after its placement in the cap.

Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:vrs:gosmin:v:29:y:2013:i:1:p:81-100:n:6

DOI: 10.2478/gospo-2013-0006

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