Properties, durability and cost efficiency of cement and hydrated lime mortars reusing copper mine tailings of Lefke-Xeros in Cyprus

Ince, Ceren; Derogar, Shahram; Gurkaya, Koray; Ball, Richard

doi:10.1016/j.conbuildmat.2020.121070

Cited by 30 publications

(14 citation statements)

References 54 publications

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“…Ordinary Portland cement (OPC) with the initial and final setting times of 103.1 min and 413.2 min purchased from the Ningguo cement plant of Anhui Conch Cement Co., Ltd., Ningguo city, China is used. The density of the OPC is 3.03 g/cm 3 . Zhejiang Yongji Metal Materials Technology Co., Ltd., Jinhua, China offers the SAD for this research.…”

Section: Experimental Section 21 Raw Materialsmentioning

confidence: 99%

“…The generation and accumulation of solid waste in today's society are relatively complex environmental problems that trouble human beings [1]. Considering that the landfill deposits of this material will cause serious pollution to the environment, the solidification technology of solid waste appears to be very necessary [2,3]. The solidification technology of solid waste includes their use in concrete and the solidification effect of CO 2 applied for the disposal of the solid waste [4,5].…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Salt Erosion on the Mechanical Performances of Ultra-High-Performance Concrete with Secondary Aluminum Dross

Sun,

Shi

et al. 2024

Coatings

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Secondary aluminum dross containing a large amount of active substance can be used to prepare concrete. The mechanical strengths, the mass loss rate (MR) and the relative dynamic modulus of elasticity (RME) of ultra-high-performance concrete with secondary aluminum dross are researched. The NaCl freeze–thaw cycles (F-Cs) and dry–wet alternation (D-A) effects with NaCl and Na2SO4 are considered. The corresponding permeability of chloride ions and the carbonation depth (Dc) are obtained. The scanning electron microscope (SEM) photos are researched to reveal the variation of the mechanical mechanism. Results show that after specimens’ suffering from the action of 20 NaCl D-As, the MR of ultra-high-performance concrete is the highest. Specimens exposed to 200 NaCl F-Cs show the lowest MR and CMC. The RME of UHPC under salt actions increase in the order of 20 NaCl D-As < 20 Na2SO4 D-As < 200 NaCl F-Cs. After suffering 200 NaCl F-Cs, 20 Na2SO4 D-As and 20 NaCl D-As, the corresponding Dc values are 1.86 mm to 2.31 mm, 1.79 mm to 2.23 mm and 2.11 mm to 2.76 mm. The flexural strength decreases at the rates of 0.99%–25%, 3.92%–27.84% and 1.47%–21.59% respectively. The MR increases and the RME decreases as the cubic function changes with the amount of salt erosion. After the secondary aluminum dross is added, the CMC decreases at the rates of 0% to 11.53%, 0% to 33.17% and 0% to 8.41% during the process of the salt action. The SAD can reduce the Dc with the decreasing rates of 19.48%, 23.55% and 19.73%. The SAD can increase the compactness of ultra-high-performance concrete. Ultra-high-performance concrete suffering from 20 NaCl D-As shows the largest number and the highest width of cracks. However, when the specimens are exposed to 20 Na2SO4 D-As, the number of cracks is the lowest and the width is the narrowest.

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Section: Experimental Section 21 Raw Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Influence of Salt Erosion on the Mechanical Performances of Ultra-High-Performance Concrete with Secondary Aluminum Dross

Sun,

Shi

et al. 2024

Coatings

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“…Currently, the easiest and most cost-effective method for mine waste disposal is to reuse tailings as cemented paste backfill (CPB) and transfer them to underground cavities [1][2][3]. Generally, the cemented paste backfilling technology tends to be a sustainable way in mining and green mines construction by facilitating the disposal of mine spoils efficiently, which reduces the dangers of tailings dam collapse and promotes the recovery of resources [4][5][6]. The use of CPB in backfilling technology is desirable for mine backfill plants due to its non-classification, non-segregation, and non-sedimentation characteristics [2].…”

Section: Introductionmentioning

confidence: 99%

The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

et al. 2022

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Cemented paste backfill (CPB) has become a significant structural material in most mines across the world. In this study, the effects of chemical rheological additives including viscosity modifying agent (i.e., polyacrylamide) and polycarboxylate superplasticizer (PCE) on fresh and hardened properties of CPB with different water-to-solid (W/S) ratios and water-to-cement (W/C) ratios were investigated. The microstructure of CPB specimens was also characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and backscattered electron image (SEM-BSE). The obtained results indicate that PAM (polyacrylamide) dosage and W/S are the most significant parameters influencing the workability of fresh CPB mixtures. For the hardened CPB specimens, the decreasing W/S ratio leads to higher flexural and compressive strength values and lower dry shrinkage strains. The interfacial transition zone (ITZ) between the cement matrix and the tailings sand was also observed to be narrower, with fewer micro cracks and capillary pores. Meanwhile, the existence of PAM decreased the number of hydration products and retarded the hydration reaction. Overall, the CPBs with high W/C ratios (i.e., 1.0 and 1.2), low W/S ratios (i.e., 0.3), and moderate amounts of rheological additives (i.e., 0.05% PAM and 1.0% PCE) have excellent fresh and hardened properties. The findings of this study contribute to better optimization of CPB mixtures in backfill construction, bringing benefits of low costs and low environmental impacts.

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“…In this work, we report the use of nanotechnology in the development of a novel photocatalytic lime render with an aim to improve indoor air quality through the breakdown of formaldehyde [58,59] as well as outdoor air quality by NO x abatement. Lime-based mortars and renders exhibit a number of important advantages over more commonly used cement-based materials such as vapor permeability and the ability to accommodate movement [60][61][62][63][64][65]. Their hardening over months or years by carbonation contributes to these properties along with the ability to self-heal (due to the limited solubility of calcium carbonate), which may enhance a long-term mechanical bonding with embedded nanoparticles [66][67][68][69][70].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Lime Render for Indoor and Outdoor Air Quality Improvement

et al. 2021

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This article reports a novel photocatalytic lime render for indoor and outdoor air quality improvement that is composed of a lime binder and doped TiO2 (KRONOClean 7000®) nanoparticles. These nanoparticles were distributed throughout the bulk of the finishing render, instead of as a thin coating, thus ensuring the durability of the photocatalytic properties upon superficial damage. The physical properties of these renders were not affected by the addition of nanoparticles except in the case of surface area, which increased significantly. In terms of their photocatalytic activity, these novel lime renders were shown to degrade up to 12% NOx under UV light and up to 11% formaldehyde under visible light.

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Properties, durability and cost efficiency of cement and hydrated lime mortars reusing copper mine tailings of Lefke-Xeros in Cyprus

Cited by 30 publications

References 54 publications

The Influence of Salt Erosion on the Mechanical Performances of Ultra-High-Performance Concrete with Secondary Aluminum Dross

The Influence of Salt Erosion on the Mechanical Performances of Ultra-High-Performance Concrete with Secondary Aluminum Dross

The Role of Rheological Additives on Fresh and Hardened Properties of Cemented Paste Backfill

Photocatalytic Lime Render for Indoor and Outdoor Air Quality Improvement

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