Cementitious activity optimization studies of iron tailings powder as a concrete admixture

Yang, Mingjing; Sun, Jianheng; Dun, Chenyang; Duan, Yajing; Meng, Zhongwei

doi:10.1016/j.conbuildmat.2020.120760

Cited by 52 publications

(31 citation statements)

References 15 publications

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“…This indicates that mechanical grinding facilitates the physical action and activity effect of IOTs, but the increase in concrete strength slows down after grinding time beyond 2 h. This is because the agglomeration effect occurs between the IOTs particles after grinding for more than 2 h, and the IOTs mainly play the filling effect in the SCMs. Although the IOTs activity is increasing under the action of mechanical force, the strength increase is not obvious due to the reduction of the filling effect [ 46 ].…”

Section: Resultsmentioning

confidence: 99%

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Application of Iron Tailings-Based Composite Supplementary Cementitious Materials (SCMs) in Green Concrete

Zhang

Yang

et al. 2022

Materials

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How to treat the iron tailings of mining solid waste with high value is an urgent problem on a global scale. In recent years, the application of iron tailings in the building materials industry has attracted the attention of many scholars. The conversion of iron tailings into green building materials helps achieve carbon neutrality and high-value utilization of solid waste, and promotes sustainable development. Although iron tailings have been extensively studied as supplementary cementitious materials, the performance of concrete is not ideal due to its low activity. In this study, the hybrid supplementary cementitious materials system was prepared by iron tailings, phosphorus slag, and steel slag, and the effects of supplementary cementitious materials type, iron tailings content, iron tailings grinding time, and supplementary cementitious materials content on concrete performance were studied. The compressive properties, iron tailings properties, pore structure, interfacial transition zone, and element distribution of hydration products of concrete were tested by compressive strength tests, X-ray Diffractometer (XRD), X-ray Photoelectron Spectroscopy (XPS), Mercury Intrusion Porosimetry (MIP), Backscattering Electron Tests (BSE), and Energy Dispersive Spectrometer (EDS). The results show that further grinding improves the iron tailings activity. There is a synergistic mechanism between steel slag and phosphorus slag in the composite supplementary cementitious materials, which overcomes the low activity defect of iron tailings and produces concrete with a compressive strength exceeding 40 MPa. The composite supplementary cementitious materials can optimize the interfacial transition zone of the concrete interface and reduce the calcium–silicon ratio of the hydration products. However, it will deteriorate the pore structure of the concrete matrix, cause part of the concrete matrix to be damaged and lead to a loss of compressive strength, and the loss is acceptable. This work broadens the methods of comprehensive utilization of iron tailings and also provides a reference for a more detailed understanding of the properties of iron tailings-based concrete.

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Section: Resultsmentioning

confidence: 99%

“…With the increase in grinding time, IOTs undergo brittle damage. Mechanical forces destroy their mineral structure, the particles become smaller, and the specific surface area increases rapidly [ 22 , 46 ]. The specific surface area of IOTs particles reached a peak of 1587 m 2 /kg after 2 h of mechanical grinding.…”

Section: Resultsmentioning

confidence: 99%

Application of Iron Tailings-Based Composite Supplementary Cementitious Materials (SCMs) in Green Concrete

Zhang

Yang

et al. 2022

Materials

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“…With the construction of green and waste-free mines, especially the implementation of the limited mining of river sand policy, the utilization of iron ore tailings as a building material has been effectively promoted. Coarse IOT sand was used as sand and stone material for construction and produced permeable bricks, sidewalk bricks [ 16 , 17 , 18 , 19 , 20 , 21 ], cement raw materials [ 22 , 23 , 24 ], concrete [ 25 , 26 ], foamed ceramics and glass ceramics [ 27 , 28 , 29 , 30 ]. However, the high value-added industrial utilization of microfine iron tailings sludge has become an urgent problem that need to be solved.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine Grinded and Silane Grafted Iron Ore Tailings as Reinforcing Filler of Styrene Butadiene Rubber

et al. 2022

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In order to realize the high value-added resource utilization of solid waste and reduce the cost of rubber manufacturing, iron ore tailings (IOTs) were used as raw material to prepare a reinforcing filler of rubber through ultrafine grinding and surface organic modification techniques. We studied the effects of ball mill grinding conditions on the particle size and distribution of grinded iron ore tailings (G-IOTs). The effects of bis-(triethoxy-silyl-propyl)-tetrasulfide (Si69)-modified G-IOT (Si69-G-IOT) loading levels on the cure characteristics, static mechanical and dynamic mechanical properties of the styrene butadiene rubber (SBR) composites were also explored in this paper. The grinding and modification mechanism of IOTs and the combination of filler and SBR matrix were explored by grinding simulation of population balance model, X-ray diffraction analysis, Fourier transform infrared spectroscopy and scanning electron microscopy. The results showed that when grinding IOTs at 2000 r/min for 150 min, the particle size distribution of the resulting G-IOTs was the narrowest, with a D90 value of 4.42 μm. The tensile strength and elongation at break of SBR filled with 120 phr Si69-G-IOT were 14.97 MPa and 596.36%, respectively.

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“…Carbonation and freeze-thaw damage of concrete are important reasons for durability deterioration of concrete [8][9][10][11][12]; the research on carbonation and freeze-thaw of iron tailings powder concrete is the necessary premise to ensure its extensive application. At present, domestic and foreign scholars have some research on the use of iron tailing powder as concrete admixture, mainly focusing on the mechanical properties of concrete [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Research on Carbonation Characteristics and Frost Resistance of Iron Tailings Powder Concrete under Low‐Cement Clinker System

Liu

Zhang

et al. 2020

Advances in Materials Science and Engineering

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The accelerated carbonation, natural carbonation, fast freeze-thaw test, and pore structure analysis of C30 and C50 concrete with different proportions of iron tailings powder and slag powder were tested, respectively. The results show that the accelerated carbonation depth and natural carbonation depth of concrete increase with the increase of iron tailings powder content. The prediction model of carbonation depth of iron tailings powder concrete is established by introducing the iron tailings content coefficient and strength influence coefficient. The error between the calculated value of the model and the test value of 28 d curing concrete natural carbonation depth is small, which proves that the model is completely feasible. When iron tailings powder accounts for 50% of mineral admixture, it is helpful to improve the frost resistance of concrete. According to the pore structure analysis, the introduction of iron tailings powder can optimize the pore structure, improve the porosity of harmless and less harmful pores, and thus improve the frost resistance.

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Cementitious activity optimization studies of iron tailings powder as a concrete admixture

Cited by 52 publications

References 15 publications

Application of Iron Tailings-Based Composite Supplementary Cementitious Materials (SCMs) in Green Concrete

Application of Iron Tailings-Based Composite Supplementary Cementitious Materials (SCMs) in Green Concrete

Ultrafine Grinded and Silane Grafted Iron Ore Tailings as Reinforcing Filler of Styrene Butadiene Rubber

Research on Carbonation Characteristics and Frost Resistance of Iron Tailings Powder Concrete under Low‐Cement Clinker System

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