Effects of incorporating large quantities of copper tailings with various particle sizes on the strength and pore structure of cement-based materials

Chen, Sung-Ching; Gao, Meng-Yao; Lin, Wei‐Ting; Liang, Jiongfeng; Li, Dongwei

doi:10.1016/j.conbuildmat.2022.127150

Cited by 39 publications

(3 citation statements)

References 27 publications

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“…The results show that the samples with tailings contain more fibrous C-S-H crystals and have higher strength. Tailings instead of natural river sand can improve the pore structure of concrete and increase the strength [11]. Deniz Adiguzel found that if the sum of SiO 2 , Al 2 O 3 , and Fe 2 O 3 in tailings exceeded 75%, the strength of the concrete could be improved by replacing part of the cement in the concrete with tailings [3].…”

Section: Introductionmentioning

confidence: 99%

Research on New Solid Waste Heat Insulation Material for Deep Mining

Wen

Zheng

2023

Minerals

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The global demand for mineral resources has led to the gradual transformation of the mining industry from the traditional shallow, small-scale mining mode to the high-intensity mining of deep underground mines. Due to the high stress, high temperature, high permeability, and easy disturbance of deep mines, new challenges have been brought to the mining of materials. Some scholars have improved the thermal insulation performance of concrete by adding low thermal conductivity materials such as ceramsite, shell, and natural fiber to traditional shotcrete, but there are still high costs, insufficient support strength, and unsatisfactory thermal insulation effects. Given the background related to the fact that it is still not possible to fully recycle the large amount of solid waste generated by mining activities, this paper, with traditional shotcrete as its basis, uses coal fly ash to replace part of the cement and tailings to replace part of the sand and gravel aggregate. In addition, it adds basalt fiber to reduce thermal conductivity and restore strength. An orthogonal experiment of three factors and three levels was designed to explore a new type of solid waste-based thermal insulation support shotcrete material. Through the testing and analysis of the mechanical and thermal properties of the specimens, it was concluded that the optimal ratio of the materials was 45% fly ash, 50% tailings, and 25% basalt fiber (the percentage of the total mass of fly ash and cement). The compressive strength of the specimens after curing for 28 days could reach 16.26 MPa, and the thermal conductivity and apparent density were 0.228561 W/(m·k) and 1544.00 kg/m3, respectively. By using COMSOL Multiphysics multi-physics coupling software to analyze the coupling of the stress field and temperature field, it was concluded that the optimum thickness of the thermal insulation layer of this material was 150 mm. The field application in a mine in Shandong Province proved that it met the effects of thermal insulation (the ability to isolate heat conduction) and support. The successful trial of this material provides a new idea for the solving of the problem of heat damage and solid waste utilization in deep mines, which has a certain practical significance.

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Section: Introductionmentioning

confidence: 99%

Research on New Solid Waste Heat Insulation Material for Deep Mining

Wen

Zheng

2023

Minerals

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“…After deep reduction and extraction of zinc and iron, the main crystalline phase of CS is belite (C 2 S). After quenching and tempering treatment, part of C 2 S is converted into alite (C 3 S), which is basically ordinary Portland clinker with strength close to 42.5 ordinary Portland cement, indicating that copper slag has good potential in preparing ordinary cement [ 7 , 8 , 9 , 10 , 11 , 12 ]. The incorporation of CS can effectively improve the water absorption of concrete, and the clinker produced with copper slag poses few environmental problems.…”

Section: Introductionmentioning

confidence: 99%

A Study on Chloride Corrosion Resistance of Reactive Powder Concrete (RPC) with Copper Slag Replacing Quartz Sand under Freeze–Thaw Conditions

Li,

Liu,

Chen

et al. 2023

Materials

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In order to study the influence of freeze–thaw cycles on chloride ion corrosion resistance of RPC with copper slag (CS) instead of quartz sand (QS), the 28d uniaxial compressive strength (UCS) of CSRPC with a different CS substitution rate was investigated by unconfined compression tests. The electric flux test method was used to study the chloride ion diffusion resistance of CSRPC after freeze–thaw cycles, and the pore size distribution was obtained through the nuclear magnetic resonance (NMR) method. Then, a mathematical relationship between the chloride ion diffusion coefficient and the pore fractal characteristic parameter T was established to study the effect of freeze–thaw cycles on chloride ion diffusion. Finally, SEM/EDS, XRD, and DTG methods were combined to study the influence of the distribution of Friedel’s salts generated after freeze–thaw cycles on chloride ion diffusion in CSRPC. The results indicate that CS has a micro aggregate effect and pozzolanic activity, which can effectively improve the chloride ion diffusion resistance of CSRPC after freeze–thaw cycles. In addition, the electric flux of CSRPC decreases with the increase in freeze–thaw cycles, and the chloride diffusion coefficient is closely related to the pore fractal dimension.

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“…Currently, the most common treatment method for tailings is cement-based filling [9,10]. However, the cost of cement accounts for approximately 70% of the total filling cost in cement-based filling mining and has become a key limiting factor [11,12]. Relevant studies have shown that cement has the disadvantages of poor cementation ability, low filling strength, and high hydration heat for fine-grained tailings [13,14].…”

Section: Introductionmentioning

confidence: 99%

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

Li,

Huang,

et al. 2023

Materials

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To mitigate the adverse effects of fine-grained lithium mica tailings and other solid wastes generated from the extraction of lithium ore mining, as well as the limitations of traditional cement-based binders for lithium mica fine tailings, this study explores the feasibility of using a binder composed of ordinary Portland cement, lithium slag, fly ash, and desulfurization gypsum to stabilize lithium fine tailings into cemented lithium tailings backfill. Compared with traditional cementitious binders, an extensive array of experiments and analyses were conducted on binders formed by various material proportion combinations, employing uniaxial compressive strength tests, microstructural morphology, grayscale analyses, and flowability tests. The results show the following: (1) In this study, an LSB binder exhibiting superior mechanical properties compared to traditional cementitious binders was identified, with an optimal OPC:LS:FA:DG ratio of 2:1:1:1. (2) In the context of cemented lithium mica fine tailings, the LSB-CLTB material exhibits higher unconfined compressive strength and lower self-weight compared to OPC-CLTB materials. At a binder content of 10 wt%, the UCS values achieved by the LSB-CLTB material at curing periods of 7 days, 14 days, and 28 days are 0.97 MPa, 1.52 MPa, and 2.1 MPa, respectively, representing increases of 40.6%, 34.5%, and 44.8% over the compressive strength of OPC-based materials under the same conditions. (3) The LSB binder not only exhibits enhanced pozzolanic reactivity but also facilitates the infilling of detrimental pores through its inherent particle size and the formation of AFt and C-(A)-S-H gels via hydration reactions, thereby effectively improving the compressive strength performance of fine-grained tailings backfill.

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Effects of incorporating large quantities of copper tailings with various particle sizes on the strength and pore structure of cement-based materials

Cited by 39 publications

References 27 publications

Research on New Solid Waste Heat Insulation Material for Deep Mining

Research on New Solid Waste Heat Insulation Material for Deep Mining

A Study on Chloride Corrosion Resistance of Reactive Powder Concrete (RPC) with Copper Slag Replacing Quartz Sand under Freeze–Thaw Conditions

Lithium Slag and Solid Waste-Based Binders for Cemented Lithium Mica Fine Tailings Backfill

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