Time-dependent rheological behaviour of cemented backfill mixture

Deng, Xuejie; Klein, Bern; Zhang, J. X.; Hallbom, Donald; Wit, B. de

doi:10.1080/17480930.2016.1239305

Cited by 32 publications

(10 citation statements)

References 52 publications

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“…When the fly ash is added, the water volume in the tailings particle network within the slurry decreases and the number of direct particle-particle contacts increases. Deng et al [28] reported that the shear thinning behavior becomes more pronounced as the solid concentration increases, which was not observed in the specimen mixtures. Also, the finer ash particles fill the voids between the larger tailings, thereby making it more difficult for the solid particles to slide past one another during shearing.…”

Section: Resultsmentioning

confidence: 99%

Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Lee

Kim

2017

Minerals

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Abstract:Coal fly ash has potential applications in the management of reactive mine tailings. The shear stress versus shear rate curves obtained during viscometer tests are presented to describe the rheological behaviors of tailings slurries mixed with fly ash. The investigation was conducted on specimens prepared with different fly ash additions as well as prepared at variable conditions of temperature, mixing time, and CaCl 2 solution. It was observed that the rheological properties of ash-tailings slurry mixtures are influenced by the hydration of fly ash as well as the particle packing and arrangement. Rheological properties of specimen mixtures were determined from the resulting flow curves using the existing rheological models. The performance of prediction models in calculating the rheological properties of the mixed specimens, as quantified by the root mean square error (RMSE), varied with the mixture constituents, temperature, and time. In general, the Papanastasion, Herschel-Bulkley, Sisko, and Robertson-Stiff models were found to be favorable for use with mixtures of fly ash and tailings slurries, compared to the Bingham, Modified Bingham, Casson, and De Kee models.

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Section: Resultsmentioning

confidence: 99%

Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Lee

Kim

2017

Minerals

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“…Additionally, it can be seen that the 2nd and the 3rd peaks do not change much, identifying that the amount of pore water and free water changes little during the short-duration hydration. In addition, it is implied that during the hydration time of 10 min to 1 h, the peak value of the 1st peak decreases more than during 1 h-8 h. This is mainly because during the hydration process of CPB mixture the reaction between water and binder is stronger in the first 30 min [22].…”

Section: Effects Of Polynaphtalene Sulfonate On the Hydrationmentioning

confidence: 93%

Effects of Superplasticizer on the Hydration, Consistency, and Strength Development of Cemented Paste Backfill

et al. 2018

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The strength and consistency of cemented paste backfill (CPB) are of key concerns in the stope stability and cost control for underground mines. It is common practice to use additives, such as superplasticizer, to improve the performance of CPB. This study mainly focuses on the effects of superplasticizer on the hydration, consistency, and strength of CPB. In this study, a polynaphtalene sulfonate was used as the superplasticizer. The binder is a mix of 33.3% ordinary Portland cement and 66.7% fly ash. The CPB specimens with a tailings-binder ratio of 3:1 and a solid concentration of 70% were then tested by a low field nuclear magnetic resonance system after different hydration times. Effects of polynaphtalene sulfonate on the hydration, fluidity, and strength were investigated. Results showed that the polynaphtalene sulfonate has a strong influence on short-duration hydration, which may contribute to the strength increase of CPB. It has been demonstrated that the polynaphtalene sulfonate improved the fluidity of the CPB mixture. With the increased dosage of polynaphtalene sulfonate, the slump increased. It was also found that the polynaphtalene sulfonate dosage has a negligible effect on the 1 day (d) strength while it has a strengthening effect on the 7 d, 14 d, and 28 d strength of CPB specimens.

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“…Based on the conventional coal mining method's production system, RMCPB is a backfill mining method with circulation operation of "driving roadway for mining and filling one by one" [17][18][19]. e principle is to excavate the crossheading between two roadways of a fully mechanized road header's working face.…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Risk Assessment and Prevention of Surface Subsidence under Buildings by Cemented Paste Filling and Strip Mining Methods: A Case Study

Sun

Zhou

Song

et al. 2021

Advances in Civil Engineering

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Intensive and continuous mining of coal resources in China implies their gradual exhaustion, especially in the eastern regions. While some mines face closure, others have to extract residual coal resources under buildings, water bodies, and industrial sites. Thus, safe and efficient mining of the residual coal resources requires innovative techniques, which would account for the particular site’s geological conditions. In this study, two schemes of roadway mining with cemented paste backfilling (RMCPB) and strip mining are put forward. After analyzing the type, construction, and protection standard of the buildings, the probability integration method and the prediction model are used to assess the surface subsidence and deformation. The research results show that both schemes can control the surface deformation to a certain extent, but RMCPB combines the advantages of a high coal recovery rate and disposal of gangue waste. According to the surface subsidence predicted and measured data, the RMCPB method can effectively control the surface subsidence, deformation, and buildings’ safety. It also yields significant economic and environmental benefits.

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Time-dependent rheological behaviour of cemented backfill mixture

Cited by 32 publications

References 52 publications

Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Rheology of Fly Ash Mixed Tailings Slurries and Applicability of Prediction Models

Effects of Superplasticizer on the Hydration, Consistency, and Strength Development of Cemented Paste Backfill

Risk Assessment and Prevention of Surface Subsidence under Buildings by Cemented Paste Filling and Strip Mining Methods: A Case Study

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