Laboratory Study on Strength Development in Cemented Paste Backfills

Niroshan, Naguleswaran; Sivakugan, Nagaratnam; Veenstra, Ryan

doi:10.1061/(asce)mt.1943-5533.0001848

Cited by 24 publications

(12 citation statements)

References 14 publications

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“…The UCS, as an important mechanical property, demonstrates whether the backfill grouting materials are damaged under loading [ 30 ]. The cylindrical samples with height-diameter ratio 2:1 (36.0 mm in diameter and 72.0 mm in height [ 21 ]) were prepared for measurement.…”

Section: Methodsmentioning

confidence: 99%

Performance Optimization and Characterization of Soda Residue-Fly Ash Geopolymer Paste for Goaf Backfill: Beta-Hemihydrate Gypsum Alternative to Sodium Silicate

et al. 2020

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Solid waste soda residue (SR), as an industrial pollutant of water, air and soil environment, can be utilized to prepare the low-calcium fly ash (FFA)-based geopolymer paste activated by sodium silicate (NS) solution for goaf backfill. However, the high addition of NS produces the high cost and high strength of synthesized backfill material in the previous study. The objective of this research is to investigate the cost optimization method and performance evaluation of SR-FFA-based geopolymer backfill paste. The alkaline beta-hemihydrate gypsum (BHG) alternative to partial NS was proposed. Scanning electron microscopy (SEM), X-ray diffraction (XRD) as well as Fourier transform infrared spectrometer (FTIR) tests were performed to clarify the role of BHG and evaluate the microstructures and products of backfill pastes. The results show that 10% BHG alternative ratios effectively improve fluidity, setting time and compressive strength to satisfy the performance requirement of goaf backfill material. The gel products in the optimal backfill paste C4 with 10% BHG alternative ratios are determined as the coexistence of C-S-H gel, (N,C)-A-S-H gel and CaSO4·2H2O at 28 d. The research results can make extensive utilization of SR and FFA in cemented paste backfill to synthesize cleaner material at a larger scale.

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Section: Methodsmentioning

confidence: 99%

Performance Optimization and Characterization of Soda Residue-Fly Ash Geopolymer Paste for Goaf Backfill: Beta-Hemihydrate Gypsum Alternative to Sodium Silicate

et al. 2020

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“…Tailings containing sulfide minerals such as pyrite (FeS 2 ) may lose UCS over the long term if general use cement is used [46]. Therefore, cement is partially replaced by pozzolans in backfill to mitigate sulfate attack [46,47].…”

Section: Introductionmentioning

confidence: 99%

The Potential Re-Use of Saudi Mine Tailings in Mine Backfill: A Path towards Sustainable Mining in Saudi Arabia

et al. 2021

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The Kingdom of Saudi Arabia covers an area of approximately 2 million km2 and is rich in natural resources that are necessary for industrial development. The estimated mineral wealth beneath the Kingdom’s soil is approximately USD 1.33 trillion, as reported by the Ministry of Industry and Mineral Resources. The Kingdom’s vision for 2030 is to develop the mining sector to become the third pillar of the domestic economy. Therefore, exploration and mining activities are expected to accelerate over the next decade, which will lead to increased waste production. New executive regulations issued in January 2021 contain several sustainable elements related to the environment, social responsibility, and occupational health and safety. Therefore, this study aims to promote an example of sustainable mining activities in the Kingdom that could be adapted to meet the regulatory requirements. Cemented paste backfill samples of varying composition were made with waste materials from a Saudi copper mine for re-injection into underground mining cavities to minimize waste exposure to the environment. The samples were tested for unconfined compressive strength (UCS) after 7, 14, 28, 56, and 90 days of curing. Results from a statistically designed experiment technique show that the samples developed sufficient strength to be used in mine backfilling applications. Strong negative relationships were detected between the UCS and the water-to-binder ratio. There is strong potential for mine backfill technology to be applied to a wide range of Saudi Arabian mines to enhance the sustainability of the mining sector.

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“…For example, mine backfill prepared with tailings containing the sulfide mineral pyrite (FeS 2 ) will be prone to sulfate attack, which reduces the unconfined compressive strength (UCS) of the backfill [7]. To mitigate sulfate attack, pozzolans are widely used in mine backfill to partially replace cement [7,8]. In addition, pozzolanic materials lower binder costs, which account for approximately 75% of the operational costs of mine backfilling [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, pozzolanic materials lower binder costs, which account for approximately 75% of the operational costs of mine backfilling [9,10]. At present, wastes from industrial process that have pozzolanic characteristics are widely available, such as fly ash and granulated blast furnace slag [4,8,11,12]. Additionally, mineral or chemical admixtures are used to modify mine backfill rheological and hydration properties [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Air Entrainment on Cemented Mine Backfill Properties: Analysis Based on Response Surface Methodology

Hefni

Hassani

2021

Minerals

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As part of an extensive research program exploring the potential benefits of using air-entraining admixtures in mine backfill, the experimental study presented in this paper investigates the effect of cement and entrained air dosages on mine backfill unconfined compressive strength (UCS), fresh density, and dry density. Backfill specimens were prepared using silica sand, normal Portland cement, water, and an entrained air admixture. An experimental design with response surface methodology was adopted to develop predictive mathematical models and analyze the results. The results demonstrated that an entrained air dosage of 3.5% could improve the UCS of the mine backfill owing to better dispersion of cement particles. However, a further increase in the dosage reduced the UCS as well as the fresh and dry densities by approximately 200 and 120 kg/m3, respectively. Study results imply that using air-entraining admixtures can potentially enhance mine backfill flowability and reduce the density, thus providing safer and more sustainable working conditions in an underground mining environment.

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Laboratory Study on Strength Development in Cemented Paste Backfills

Cited by 24 publications

References 14 publications

Performance Optimization and Characterization of Soda Residue-Fly Ash Geopolymer Paste for Goaf Backfill: Beta-Hemihydrate Gypsum Alternative to Sodium Silicate

Performance Optimization and Characterization of Soda Residue-Fly Ash Geopolymer Paste for Goaf Backfill: Beta-Hemihydrate Gypsum Alternative to Sodium Silicate

The Potential Re-Use of Saudi Mine Tailings in Mine Backfill: A Path towards Sustainable Mining in Saudi Arabia

Effect of Air Entrainment on Cemented Mine Backfill Properties: Analysis Based on Response Surface Methodology

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