Flow characteristics of cemented paste backfill

Niroshan, Naguleswaran, Sivakugan, Nagaratnam, and Veenstra, Ryan Llewellyn (2018) Flow characteristics of cemented paste backfill. Geotechnical and Geological Engineering, 36 (4). pp. 2261-2272.

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Cemented paste backfill (CPB) is primarily used for backfilling underground voids at George Fisher Mine (Mount Isa, Australia). The objective of this paper is to summarise the geotechnical characterisation of the tailings and the rheological properties of the CPB as determined from a laboratory testing program undertaken at James Cook University. Two binders were examined [a General Purpose cement and a slag blend cement] over a range of dosages from 0 to 6% and CPB mix solids content in the range of 72–78%. The slump tests were carried out using the standard cone (ASTM C 143) used for concrete and a cylinder with 110 mm (diameter) × 110 mm (height), whereas the yield stress was measured using a shear vane (Brookfield vane spindle V-73). The index characteristics of the tailings including the grain size distribution, liquid limit, plastic limit, specific gravity were determined as per ASTM standards. This paper will then discuss the interrelationships among the solid content, slump, saturated density and the yield stress of the CPB. It is shown that there is strong correlation between the two different slump test devices used in this study. The smaller cylindrical device appears to have good potential for slurries like mine tailings or dredged mud that have high water content for slump test. There is also strong inter-relationship among solid content, slump, yield stress, and bulk density. Increasing the solid content increases the bulk density and yield stress, but reduces the slump. While there is hardly any difference between the two binder types used in this study in terms of flow parameters, namely the yield stress and slump, the binder dosage has an effect. At any specific solid content, higher binder dosages lead to a drop in the slump and increase in the yield stress. The difference is more pronounced in dense slurries. It is also strongly believed that the trends and relationships developed in this study may be valuable for the other mining operations using CPB.

Item ID: 52083
Item Type: Article (Research - C1)
ISSN: 1573-1529
Keywords: cemented paste backfill, rheology, slump test, yield stress, mine tailing, general purpose cement, slag cement
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A version of this publication was included as Chapters 3 and 7 of the following PhD thesis: Niroshan, Naguleswaran (2018) Cemented paste backfill modification using different types of binders and insight into its mechanical, micro-structure, and flow properties. PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Funders: James Cook University (JCU)
Projects and Grants: JCU Postgraduate Scholarship
Date Deposited: 23 Jan 2018 00:55
FoR Codes: 40 ENGINEERING > 4005 Civil engineering > 400502 Civil geotechnical engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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