Effects of slag-based cementitious material on the mechanical behavior and heavy metal immobilization of mine tailings based cemented paste backfill

Zhang, Fawen; Li, Yinyue; Zhang, Jinhui; Gui, Xin; Zhu, Xiu-Hong; Zhao, Changmin

doi:10.1016/j.heliyon.2022.e10695

Cited by 24 publications

(7 citation statements)

References 87 publications

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“…Based on the results, it can be seen that increasing the curing age in the concrete of each design has led to an improvement in compressive strength. This issue is due to the progress of the chemical reaction process and the production of a higher volume of hydrated gels such as C-S-H in the concrete composition at the same time as the age curing of the concrete increases [44]. By increasing NS particles in GPC, the compressive strength of concrete has improved.…”

Section: Results Of the Compressive Strength Testmentioning

confidence: 99%

Investigating the Mechanical and Durability Properties of Geopolymer Concrete Based on Granulated Blast Furnace Slag as Green Concrete

Mansourghanaei

2023

jcer

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Geopolymer concretes (GPCs) are known as green, environmentally friendly, sustainable concretes in the development of the structural industry with superior mechanical performance and durability compared to ordinary Portland cement concrete (OPCC). This type of concrete emits less CO2 than OPCC and aims for efficient waste management while reducing environmental impacts. In this experimental research, 5 mixed designs were made of GPC based on granulated blast furnace slag (GBFS), which contains 0-8% Nano silica (NS) and 1-2% polyolefin fibers (POFs). A mixed design was also made of OPCC to compare with GPC. The tests of compressive strength, tensile strength, drop weight impact (DWI), Ultrasonic Pulse Velocity (UPV), water permeability and microstructural examination by scanning electron microscope (SEM) images and X-ray fluorescence (XRF) spectroscopy were performed on concrete samples and the results were analyzed and compared. The results obtained in this laboratory research, while overlapping with each other, indicate the superiority of mechanical properties and durability of GPC compared to OPCC.

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Section: Results Of the Compressive Strength Testmentioning

confidence: 99%

Investigating the Mechanical and Durability Properties of Geopolymer Concrete Based on Granulated Blast Furnace Slag as Green Concrete

Mansourghanaei

2023

jcer

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“…The main primary energy used in our country is coal, and the importance of coal cannot be replaced for a long time in the future [1,2] . Overall coal demand is expected to reach 8.388 million tons in 2023 [3] .…”

Section: Introductionmentioning

confidence: 99%

Study on heat storage and heat release performance of casing heat pipe heat exchanger coupled phase change backfill body

Ji,

Zhang,

Wang

et al. 2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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In order to improve the utilization of mine geothermal resource, the casing heat pipe heat exchanger coupled phase change backfill heat transfer system is proposed in this paper. The effects of the number of casing heat pipe heat exchanger (CHPHE) on the system temperature distribution, the liquid phase fraction of phase change material (PCM) and the heat storage/heat release performance of system were studied by numerical simulation. The results showed that with increase in CHPHE number, the internal temperature of backfill body increases slowly, and the melting rate of PCM slows down. In the heat storage/heat release coexistence stage, the temperature of backfill body decreases rapidly, and the solidification rate of PCM inside the casing heat exchanger accelerates. When CHPHE number is 2, 3 and 4, the complete melting time of PCM is 2.25 h, 3.16 h and 3.33 h, and the complete solidification time is 1.06 h, 1.20 h and 1.24 h respectively. As CHPHE number increases from 2 to 4, temperature difference between the inlet and outlet CHPHE cooling water during heat storage/heat release coexistence stage decreases from 3.63 ℃ to 1.63 ℃. When CHPHE number increases from 2 to 4, the total heat storage capacity increases from 3320.61 kJ to 3757.88 kJ, and the growth rate is 7.14%. While the heat release capacity increases from 2881.06 kJ to 3110.97 kJ, and the growth rate is 7.98%. However, the more CHPHE number, the greater the thermal interference between heat pipe heat exchangers, and the smaller system energy efficiency coefficient -The energy efficiency coefficient of CHPHE-PCB system will reduce from 86.76% to 82.77%(a reduction of 3.99%) as CHPHE number increases from 2 to 4. The research results obtained in this study can guild the highly efficient exploitation of mine geothermal energy.

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“…However, using cement will undoubtedly increase the cost of the filling materials. Therefore, numerous scholars have studied the use of slag, fly ash, desulfurization gypsum, and other industrial solid waste instead of cement to prepare cemented filling materials [9][10][11][12][13]. Zhao et al [14] prepared a filling material using an ultrafine tailing with an average particle size of 44.51 µm, under the conditions of a 1:10 cement-sand ratio and a 70% solid mass concentration.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Mechanical Properties and Hydration Process of Slag Cemented Ultrafine Tailings Paste Backfill

Li,

Wan,

Jin

et al. 2024

Sustainability

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Paste backfill prepared with ultrafine tailings often faces difficulties in meeting engineering requirements. To address the challenge of using ultrafine tailings, this work utilized a slag cemented ultrafine tailings paste backfill (SCUPB) composed of slag, Portland cement, and desulfurized gypsum as the cementitious materials, with a binder–tailing ratio of 1:4 and a solid mass concentration of 60%. The fluidity and compressive strength of the SCUPB were tested at 3 days, 7 days, and 28 days, while the microstructure and hydration process of the SCUPB were studied by scanning electron microscopy and isothermal calorimetry. The results reveal that the fluidity of the SCUPB decreases with the increase in the slag content and increases with the decrease in the c/g ratio. SCUPB attains the highest early compressive strength with a slag content of 70% and a c/g ratio of 3:2 (with the cement content at 18% and the desulfurized gypsum content at 12%). In this slag–gypsum–cement system, the combined activation of the slag by the cement and desulfurized gypsum exhibits a higher early compressive strength. This work utilized ultrafine tailings to prepare paste backfill that meets the engineering requirements, achieving the effective utilization of ultrafine tailings in mine backfilling projects.

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Effects of slag-based cementitious material on the mechanical behavior and heavy metal immobilization of mine tailings based cemented paste backfill

Cited by 24 publications

References 87 publications

Investigating the Mechanical and Durability Properties of Geopolymer Concrete Based on Granulated Blast Furnace Slag as Green Concrete

Investigating the Mechanical and Durability Properties of Geopolymer Concrete Based on Granulated Blast Furnace Slag as Green Concrete

Study on heat storage and heat release performance of casing heat pipe heat exchanger coupled phase change backfill body

A Study on the Mechanical Properties and Hydration Process of Slag Cemented Ultrafine Tailings Paste Backfill

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