Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications

The rheological properties (yield stress, flow index and infinite dynamic viscosity) and mechanical properties (unconfined compressive strength, UCS) of different cemented paste backfill (CPB) recipes must be determined during the laboratory optimization phase. However, the influence of the mixing p...

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Autores principales:	Reagan Kabanga Dikonda, Mamert Mbonimpa, Tikou Belem
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cemented paste backfill (CPB) CPB formulation specific mixing energy rheological properties UCS energy dissipation during CPB transportation Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/560173f7d28044749190282cc70c46f3
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spelling	oai:doaj.org-article:560173f7d28044749190282cc70c46f32021-11-25T18:25:52ZSpecific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications10.3390/min111111592075-163Xhttps://doaj.org/article/560173f7d28044749190282cc70c46f32021-10-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1159https://doaj.org/toc/2075-163XThe rheological properties (yield stress, flow index and infinite dynamic viscosity) and mechanical properties (unconfined compressive strength, UCS) of different cemented paste backfill (CPB) recipes must be determined during the laboratory optimization phase. However, the influence of the mixing procedure on these properties has scarcely been studied so far. The objective of this paper is to assess to what extent these properties depend on the specific mixing energy (SME) for a given type of mixer. CPB recipes were prepared based on two types of tailing (CPB-T1 and CPB-T2, also referred to as T1 and T2) at a fixed solid percentage for each type of tailing using the Omcan laboratory mixer. A mixture of 80% slag and 20% GU was used as a binder. The mixing time and the rotation speed of the mixer were successively varied. For each recipe prepared, we determined the SME, the rheological properties of fresh CPB (at the end of mixing) and the UCS at 7, 28 and 90 days of curing. The results show that yield stress and infinite viscosity decreased when SME increased in an interval going from 0.3 to 3.8 Wh/kg and 0.6 to 6 Wh/kg for CPB-T1 and CPB-T2, respectively. An increasing trend in UCS with increasing SME was also observed. Empirical equations describing the change of the rheological properties with the SME are used to estimate the change in rheological properties of CPB along the distribution system, considering the specific energy dissipation during CPB transportation. A mixing procedure for obtaining CPB mixtures that are representative of CPB deposited in underground mine stopes is suggested for laboratories who currently use a same mixing procedure, irrespective of the variable field specific energy.Reagan Kabanga DikondaMamert MbonimpaTikou BelemMDPI AGarticlecemented paste backfill (CPB)CPB formulationspecific mixing energyrheological propertiesUCSenergy dissipation during CPB transportationMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1159, p 1159 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cemented paste backfill (CPB) CPB formulation specific mixing energy rheological properties UCS energy dissipation during CPB transportation Mineralogy QE351-399.2
spellingShingle	cemented paste backfill (CPB) CPB formulation specific mixing energy rheological properties UCS energy dissipation during CPB transportation Mineralogy QE351-399.2 Reagan Kabanga Dikonda Mamert Mbonimpa Tikou Belem Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications
description	The rheological properties (yield stress, flow index and infinite dynamic viscosity) and mechanical properties (unconfined compressive strength, UCS) of different cemented paste backfill (CPB) recipes must be determined during the laboratory optimization phase. However, the influence of the mixing procedure on these properties has scarcely been studied so far. The objective of this paper is to assess to what extent these properties depend on the specific mixing energy (SME) for a given type of mixer. CPB recipes were prepared based on two types of tailing (CPB-T1 and CPB-T2, also referred to as T1 and T2) at a fixed solid percentage for each type of tailing using the Omcan laboratory mixer. A mixture of 80% slag and 20% GU was used as a binder. The mixing time and the rotation speed of the mixer were successively varied. For each recipe prepared, we determined the SME, the rheological properties of fresh CPB (at the end of mixing) and the UCS at 7, 28 and 90 days of curing. The results show that yield stress and infinite viscosity decreased when SME increased in an interval going from 0.3 to 3.8 Wh/kg and 0.6 to 6 Wh/kg for CPB-T1 and CPB-T2, respectively. An increasing trend in UCS with increasing SME was also observed. Empirical equations describing the change of the rheological properties with the SME are used to estimate the change in rheological properties of CPB along the distribution system, considering the specific energy dissipation during CPB transportation. A mixing procedure for obtaining CPB mixtures that are representative of CPB deposited in underground mine stopes is suggested for laboratories who currently use a same mixing procedure, irrespective of the variable field specific energy.
format	article
author	Reagan Kabanga Dikonda Mamert Mbonimpa Tikou Belem
author_facet	Reagan Kabanga Dikonda Mamert Mbonimpa Tikou Belem
author_sort	Reagan Kabanga Dikonda
title	Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications
title_short	Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications
title_full	Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications
title_fullStr	Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications
title_full_unstemmed	Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications
title_sort	specific mixing energy of cemented paste backfill, part ii: influence on the rheological and mechanical properties and practical applications
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/560173f7d28044749190282cc70c46f3
work_keys_str_mv	AT reagankabangadikonda specificmixingenergyofcementedpastebackfillpartiiinfluenceontherheologicalandmechanicalpropertiesandpracticalapplications AT mamertmbonimpa specificmixingenergyofcementedpastebackfillpartiiinfluenceontherheologicalandmechanicalpropertiesandpracticalapplications AT tikoubelem specificmixingenergyofcementedpastebackfillpartiiinfluenceontherheologicalandmechanicalpropertiesandpracticalapplications
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Specific Mixing Energy of Cemented Paste Backfill, Part II: Influence on the Rheological and Mechanical Properties and Practical Applications

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