Experimental investigation into the compressive strength development of cemented paste backfill containing Nano-silica

2016 ◽  
Vol 72 ◽  
pp. 180-189 ◽  
Author(s):  
Babak Koohestani ◽  
Tikou Belem ◽  
Ahmed Koubaa ◽  
Bruno Bussière
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Strength Development ◽  
Cemented Paste Backfill ◽  
Nano Silica ◽  
Paste Backfill ◽  
Compressive Strength Development

Effect of specimen composition on the strength development in cemented paste backfill

2006 ◽  
Vol 43 (3) ◽  
pp. 310-324 ◽  
Author(s):  
Katherine Klein ◽  
Dragana Simon
Keyword(s):  
Compressive Strength ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Unconfined Compressive Strength ◽  
Pore Fluid ◽  
Strength Development ◽  
Cemented Paste Backfill ◽  
Pore Fluid Chemistry ◽  
Paste Backfill

This paper focuses on monitoring setting and strength development in cemented paste backfill (CPB). The composition of the paste is altered to study the effects of binder type and content, selected chemical admixtures (superplasticizers), mineral additives (e.g., fly ash), and pore fluid chemistry (e.g., ionic concentration and pH) on these properties. The three main techniques utilized are shear wave velocity measurements, penetration tests (e.g., Vicat needle tests), and unconfined compressive strength tests. All of these tests are sensitive to changes in the paste composition. The effect of the pore fluid chemistry and the chemical additives on the CPB properties depends on the ion type and concentration and the chemical composition of the superplasticizers. The shear wave velocity in both uncemented and cemented pastes increases with time as a result of self-weight consolidation, capillary forces, and cementation (the precipitation of ions in uncemented tailings pastes or cement hydration in cemented tailings pastes).Key words: cemented paste backfill, shear wave velocity, setting, unconfined compressive strength.

scholarly journals The potential use of pumice in mine backfill

2020 ◽  
Vol 1 ◽  
Author(s):  
Mohammed A. Hefni
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Mining Industry ◽  
Strength Development ◽  
Natural Pozzolan ◽  
Mine Backfill ◽  
Natural Pozzolans ◽  
Cemented Backfill ◽  
Compressive Strength Development ◽  
Potential Use

Abstract The use of natural pozzolans in concrete applications is gaining more attention because of the associated environmental, economic, and technical benefits. In this study, reference cemented mine backfill samples were prepared using Portland cement, and experimental samples were prepared by partially replacing Portland cement with 10 or 20 wt.% fly ash as a byproduct (artificial) pozzolan or pumice as a natural pozzolan. Samples were cured for 7, 14, and 28 days to investigate uniaxial compressive strength development. Backfill samples containing 10 wt.% pumice had almost a similar compressive strength as reference samples. There is strong potential for pumice to be used in cemented backfill to minimize costs, improve backfill properties, and promote the sustainability of the mining industry.

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