Utilizing Iron Ore Tailing as Cementitious Material for Eco-Friendly Design of Ultra-High Performance Concrete (UHPC)

Li, Gang; Shui, Zhonghe; Gao, Xiaojian; Sun, Tao; Yu, Rui; Li, Xiaosheng

doi:10.3390/ma14081829

Cited by 28 publications

(5 citation statements)

References 56 publications

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“…Cheng et al (2016) found that IOTs after mechanical activation had pozzolanic activity and could be used as SCM for concrete. Ling et al (2021) used IOTs as the CCM to prepare environment friendly ultra-high performance concrete (UHPC), which facilitated the development of long-term compressive strength and the improvement of pore structure, thus ensuring the durability of UHPC. Cheng et al (2020) prepared concrete with strong permeability resistance and good freeze-thaw resistance by replacing part of OPC with IOTs after mechanical grinding.…”

Section: Introductionmentioning

confidence: 99%

Basic characteristics and environmental impact of iron ore tailings

Wang

Jing

et al. 2023

Front. Earth Sci.

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Introduction: In our study, various test methods were adopted to explore the mineralogical characteristics, grindability, particle morphology, particle size distribution, and environmental leaching toxicity of iron ore tailings (lOTs).Methods: The methods include petrographic analysis, X-ray diffraction (XRD), scanning electronic microscopy (SEM), synchronous thermal analyzer (DSC-TGA), electron probe X-ray microanalyser (EPMA), and synthetic precipitation leaching Procedure (SPLP).Results: The results show that the used IOTs contained 14.54% iron which was mainly stored in magnetite and pyrite. The content of iron silicate accounted for 11.82% of the total iron content. Most of it existed in silicate minerals, including grunerite and hornblende. A small amount of iron was contained in biotite, chlorite and augite. Besides, the grindability of lOTs was much better than that of granulated blast furnace slag (GBFS). After grinding for 140 min, the mass fraction of lOTs particles with the particle size less than 5 um was 44.19%. These particles could be used to fill in the voids in the cement-powder-packed structure. lOTs also contained a large number of submicron and nanoscale particles.Discussion: With great strength and environmental friendliness, the composite cementitious material (CCM) prepared from lOTs can be well applied to the building material field and environmental remediation.

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Section: Introductionmentioning

confidence: 99%

Basic characteristics and environmental impact of iron ore tailings

Wang

Jing

et al. 2023

Front. Earth Sci.

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“…In recent years, many scholars have studied the mechanical properties of concrete prepared by iron tailing sand, and there are many reports on the preparation of high-performance concrete by iron tailing powder [9][10][11]. However, there are few studies on freeze-thaw properties of iron tailings concrete and few reports on the prediction of freeze-thaw resistance of iron tailings concrete [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Prediction of the Frost Resistance of Iron Ore Tailings Concrete Based‐BP Neural Network

Fu,

Li,

Han

et al. 2023

Journal of Sensors

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In order to predict the relative dynamic elastic modulus (RDEM), which is used to reflect the frost resistance of iron ore tailings concrete, the backpropagation neural network (BPNN) was used in this study. Here, one hidden layer was chosen in the structure of BPNN. It is well known that the number of neurons in the hidden layer is the key of BPNN; hence, checking the features of overfitting was chosen in this paper to determine the number of neurons in the hidden layer. According to the actual conditions of freeze–thaw cycle test, a BPNN model of 2D input vector and 1D output vector was established. Thirty datasets from the test were used for training and test the proposed ANN. The results showed that the predicted values were in good agreement with the measured ones, and the correlation coefficient between them reached 0.9505. It showed that the BPNN, with the ability to solve nonlinear problems, had great advantages in predicting RDEM, and it can be used as reliable and simple forecasting tools for the prediction of frost resistance of iron ore tailings concrete.

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“…Lu et al, investigated the effect of curing conditions on the mechanical and microstructural properties of ultra-high-performance concrete incorporating iron tailing powder and found that the strength of concrete first increased and then decreased with the increase in iron tailing powder dosing [ 16 ]. Ling et al, conducted an environmental design study of ultra-high performance concrete using iron ore tailings as cement material and found that iron tailings promote optimization of long-term compressive strength and pore structure of concrete [ 17 ]. Another study on the influence of iron ore tailings concrete by working environmental conditions has been explored by several scholars, one after another.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete

et al. 2022

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Iron tailing solid waste not only has a high annual output but also has a low comprehensive utilization rate. Low utilization rate of iron tailings seriously restricts the development of comprehensive utilization of solid waste. In order to prepare an iron tailings-based ternary solid waste admixture and to verify its application to concrete, first, the effect of solid waste synergy on the strength of an iron tailings-steel slag-desulfurization ash admixture (ISD) system was investigated. Second, the effect of chemical activator dosing on the strength of an ISD system was studied and the mechanism of chemical activator action on the ISD system was investigated by thermogravimetric analysis (TG-DTA) Then, the effect of this admixture on the strength of concrete was studied. Finally, the mechanism of the effect of this admixture on the strength of concrete was clarified by mercury intrusion porosimetry (MIP) and backscattering electron tests (BSE). The results showed that the 7 d and 28 d compressive strengths of the ISD admixture were significantly higher than those of iron tailings single admixture. The 7 d and 28 d compressive strengths of the ISD system reached 24.9 MPa and 36.1 Mpa, respectively, when the ratio of iron tailings:steel slag:desulfurization ash = 1:1:1. Na2SiO3 is suitable for the early strength agent of the ISD admixture, but the amount of admixture should not exceed 0.6% of the admixture. TG-DTA shows that Na2SiO3 is enhancing the early strength of the ISD system by promoting the consumption of Ca(OH)2 in the ISD system to produce C-S-H. However, in the late reaction of the ISD system, Na2SiO3 inhibits the late strength development of the ISD system by suppressing Ca(OH)2 production. Concrete with ISD dosing of 30% or less meets the C40 requirement. MIP and BSE show that ISD provides a filling effect to concrete, but also causes a reduction in the active reactants of concrete and the combined effect of microfilling and active effects affects the strength development of ISD concrete. This study provides a theoretical and scientific basis for the preparation of iron tailings-based ternary solid waste dopants, and, in addition, the study promotes the consumption of iron tailings solid waste and the development of multiple solid waste dopants.

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Utilizing Iron Ore Tailing as Cementitious Material for Eco-Friendly Design of Ultra-High Performance Concrete (UHPC)

Cited by 28 publications

References 56 publications

Basic characteristics and environmental impact of iron ore tailings

Basic characteristics and environmental impact of iron ore tailings

Prediction of the Frost Resistance of Iron Ore Tailings Concrete Based‐BP Neural Network

Preparation of Mineral Admixture from Iron Tailings with Steel Slag-Desulfurization Ash and Its Application to Concrete

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