Development of a novel eco-efficient LC2 conceptual cement based ultra-high performance concrete (UHPC) incorporating limestone powder and calcined clay tailings: Design and performances

Sun, Yu; Yu, Rui; Wang, Siyu; Zhou, Y.; Zeng, Min; Hu, Fangjie; Shui, Zhonghe; Rao, B.D.V. Chandra Mohan; Yuan, Shuai; Luo, Zhuojing; Ma, Shuai

doi:10.1016/j.jclepro.2021.128236

Cited by 52 publications

(6 citation statements)

References 49 publications

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“…With the further increase of limestone powder and decrease of natural sand contents, a small number of natural sand particles are suspended in the limestone powder, which makes them insufficient to contact each other to require a stable skeleton structure and limits the improvement of mechanical strength. More importantly, the excessive limestone powder contents could not only weaken the framework effect, but also hinder the hydration of the cement, which blocks the sustainable development of the mechanical strengths [ 19 ]. Therefore, the preferable proportions of limestone powders, fly ash, Portland cement in combination with natural sand are conducive to strength developments of the concrete materials.…”

Section: Resultsmentioning

confidence: 99%

“…In general, the manufacture of 1 ton of natural sand consumes nearly 2 tons of water and produces a large amount of carbon dioxide [17]. Therefore, utilizing recyclable or waste materials to replace natural sand not only promotes the recycle of solid waste, but also substantially reduces the carbon dioxide emissions during the production process, thus contributing to an environmental sustainability development [18][19][20][21]. During the past decades, various solid waste materials including geopolymer pastes, recycled glass, mining tailings and so on have been continuously utilized to replace the natural sand for producing the 3D printing cementitious materials [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Utilization of solid mine waste in the building materials for 3D printing

Zhang,

Guo,

et al. 2023

PLoS ONE

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3D printing technology is gradually considered to be a rapid development of a green revolution in the field of architecture. Recently, utilizing solid mine waste to replace natural sand not only greatly reduces the 3D printing costs, but also contributes to an environmental sustainability development. However, most solid waste inevitably has an impact on the inherent mechanical strength and printability of concrete materials. It is an urgent requirement to expand the alternative materials and improve the overall property of 3D concrete materials. This paper reported an innovative concrete material that replaced natural sand with fine limestone powders for 3D concrete printing applications. The experimental measurements were performed including microstructures characteristics, flowability, buildability, shrinkability, layer-interface properties, mechanical properties and interlayer bonding strength. Besides, an effective method was proposed to characterize the printable properties of concrete materials and then the reasonable limestone powder replacement ratio was determined. Based on the investigation results, appropriate substituting limestone powder (40%) can effectively improve the grading of the concrete, thus promoting its printability and buildability. Moreover, the microstructures of the 3D printing concrete materials after curing were denser and their mechanical property improved by approximately 45%. With the further increase of replacement ratio, the reduction in the flowability led to a decrease of the printability. A large number of fine particles increased the shrinkage of the curing process and some bubbles were stranded inside the materials due to its increase in the viscosity, thereby reducing the mechanical properties of the hardened material. The produced concrete for 3D printing can be treated as an eco-friendly building material that contributes to the rational development and resource utilization of solid water, thus promoting the sustainable development of construction field.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Utilization of solid mine waste in the building materials for 3D printing

Zhang,

Guo,

et al. 2023

PLoS ONE

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“…In‐plane lattice parameters of the slab were fixed, allowing all atomic relaxation. A maximum residual force criterion of 0.03 eV/Å was used for surface relaxation 48–50 . During relaxation, a dipole correction was applied in the direction perpendicular to the surface, which was used to compensate for the spurious electrostatic interactions due to the asymmetry of the slab 51,52 …”

Section: Methodsmentioning

confidence: 99%

“…A maximum residual force criterion of 0.03 eV/Å was used for surface relaxation. [48][49][50] During relaxation, a dipole correction was applied in the direction perpendicular to the surface, which was used to compensate for the spurious electrostatic interactions due to the asymmetry of the slab. 51,52 The initial structures of molecules and dissociative adsorption are provided in the supporting material (Figure S1), and detailed explanations have been provided in our previous study.…”

Section: Methodsmentioning

confidence: 99%

Effect of single water adsorption on the bond order of calcium silicates and its implication for hydration variation

et al. 2022

J Am Ceram Soc

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The differences in hydration between β-C 2 S and M3-C 3 S, the main phases of silicate cement, have not been fully investigated. In this study, density functional theory calculations were used to investigate the structure and bond order of β-C 2 S and M3-C 3 S before and after the molecular and dissociative adsorption of single water atoms. The unit cell of M3-C 3 S was found to have some O atoms with lower bond orders than those in β-C 2 S, implying higher chemical reactivity of O atoms in M3-C 3 S. The total bond orders of water atoms generally decreased after molecular adsorption, but reductions were minimal, and there were even increases, when the hydrogen bonding among H and surface O atoms was very weak in several M3-C 3 S surfaces. In the case of dissociative adsorption, the bond orders of water O-H hydroxyl tended to increase, and the other bond orders among water atoms decreased sharply, even to zero in some cases. Moreover, the bond order variations of water atoms of β-C 2 S and M3-C 3 S in molecular adsorption were highly correlated with the adsorption energy, with correlation coefficients of 0.9070 and 0.8330, respectively. In both molecular and dissociative adsorption of β-C 2 S and M3-C 3 S, the total bond order among Ca atoms with other surface atoms decreased after the Ca atoms adsorbed water atoms. This phenomenon also appeared in the dissociative adsorption of surface O atoms. In M3-C 3 S, the total strength of the surface O atom bonded to other surface atoms after dissociative adsorption was similar to the strength of the surface O-H hydroxyl bond. The special O atoms in M3-C 3 S showed a clear layered arrangement on the surfaces.

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“…Nowadays, the production of Portland cement contributes 10% of anthropogenic emissions [ 4 ], although this contribution could be considered constant, due to the increase in the demand for concrete that is expected in the immediate future (especially in the developing countries), the net contribution (in terms of tons of CO 2 /ton of cement) coming from the cement industry, will be increased proportionally to the consumption of this material. However, this negative impact on sustainability can also be counteracted through a greater use of UHPC in conjunction with limestone powder and calcined clays in concrete construction practice, since the use of limestone powder and calcined clays can reduce the environmental impact by 37.1%, compared to conventional UHPC in the practice of concrete construction; likewise, an appropriate limestone powder content can contribute to higher strength, denser pore structure, lower total free shrinkage, and higher sustainability efficiency [ 2 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Limestone and Quartz Fillers in UHPC with Calcined Clay

2022

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Ultra-high-performance concrete (UHPC) is a material developed to maximize the engineering characteristics of hydraulic concrete, in terms of durability and mechanical properties, but the adoption of this technology in practice has not turned out as desired, mainly due to the high amounts of cement and silica fume required for its production, and for its consequences on both economic and ecological costs. As an option to improve the impact of UHPC, both on costs and on sustainability, this work evaluates four UHPC series with metakaolin additions of 5%, 10%, 15% and 20%, and the substitution of 37.5% of the Portland cement volume by limestone or quartz filler. The compressive strength, the bulk electrical resistivity and a set of tests for microstructural characterization (TGA, XRD and quantitative EDS) were utilized to better understand the role of calcite on the hydration and pozzolanic reactions in ternary Portland cement-metakaolin-limestone filler. Results indicate that the reaction of calcite is scarce and should be considered as a mere filler, as no increase in AFm phases were found. Nevertheless, the ternary mixture with 15% of metakaolin in addition to cement, and with 37.5% of the Portland cement volume substituted by limestone filler, was the one that presented the best performance in terms of compressive strength and bulk electrical resistivity. The results of the microstructural characterization indicate that the high kaolin content in the metakaolin originated the most significant hydration and pozzolanic reactions development between the ages of 7 and 28 days, as between 28 and 91 the reaction remained dormant. In general, the whole set of results included in this work indicate that limestone filler doesn’t act as a better filler than other kind of powders when used in ternary Portland cement-metakaolin- filler systems.

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Development of a novel eco-efficient LC2 conceptual cement based ultra-high performance concrete (UHPC) incorporating limestone powder and calcined clay tailings: Design and performances

Cited by 52 publications

References 49 publications

Utilization of solid mine waste in the building materials for 3D printing

Utilization of solid mine waste in the building materials for 3D printing

Effect of single water adsorption on the bond order of calcium silicates and its implication for hydration variation

Effect of Limestone and Quartz Fillers in UHPC with Calcined Clay

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