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The laboratory experiments reveal the uniaxial compressive strength value of collected ore sample 98.09 Mpa with elastic modules of 79.113 Mpa and 0.12 Poisson ratios in sample no. 18 shown the ...
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Against the background of "carbon peak and carbon neutrality," it is of great practical significance to develop non-blast furnace ironmaking technology for the sustainable development of steel industry. Carbon-bearing iron ore pellet is an innovative burden of direct reduction ironmaking due to its excellent self-reducing property, and the …
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Iron ore tailings (IOTs) are a type of mining and mineral waste generated by the iron ore mining industry [1]. Most IOTs are disposed of in landfills, which prevent alternative land uses and contaminate the surrounding soil [2]. ... with a room temperature compressive strength of 60.17 MPa, and a residual compressive strength as high as …
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The best compressive strength results after 28 days of curing (22.25 MPa) were obtained with a trace consisting of 50% metakaolin and 50% iron ore tailings, therefore, without slimes.
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Uniaxial compressive strength (UCS) is a key physical test relevant to iron ore crusher design and rock geomechanics for mining. Tests are typically performed on intact …
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ing density p˜ = 4.22g/cm3, uniaxial compressive strength f c = 258.08 MPa, elastic shear modulus G = 73.75 MPa, and uniaxial tensile strength f t = 15.59 MPa. Other model parameters were determined as follows. 2.2 Determination of Strain Rate Parameters Strain rate has a signicant eect on the strength of iron ore. In this model, the strain ...
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Compressive strength of the mixtures containing iron filings varied between 28.21 to 40.44 MPa at 28 days, while flexural strength ranged from 4.51 to 6.51 MPa. The study highlighted the environmental benefits of reusing iron filings in concrete, although with a decrease in compressive and flexural strength.
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In order to comprehensively utilize iron ore tailings (IOTs), the possibility of using IOTs as raw materials for the preparation of cementitious composites (IOTCCs) was investigated, and IOTCC was further applied to mine interface pollution control. ... Portland cement with a compressive strength of ≥42.5 MPa was cured for 28 d, conforming to ...
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As industrial waste, iron ore tailings (IOTs) can be mixed with bentonite and bauxite and subsequently sintered into ceramsite. Under sintering at 1120 °C, ceramsite with 60- wt% IOTs, 30- wt% bentonite, and 10- wt% bauxite showed an optimal cylinder compressive strength of 10.53 MPa, bulk density of 917.84 kg m −3, 1-h water …
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Using a molding pressure of 60 MPa, the brick achieved a compressive strength of 16.02 MPa and a flexural strength of 2.72 MPa. Elevating the molding pressure assisted in expelling air trapped within the pores, facilitating the infiltration of the alkali activator into the interior of the raw materials and enhancing the contact between particles.
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The maximum compressive strength of the specimen cast with SIOT content of 25 % was 40.2 MPa, while that of the specimen cast with SIOT content of 75 % was only 17.1 MPa. This is because the surface activities of the SIOT particles are low and more SIOT added into the mortar specimen reduces binder activity which has also been observed by van ...
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In this paper, the effects of IOT as aggregate on the flowability, compressive strength of ultra-high performance geopolymer concrete (UHPGC) were …
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The preparation of iron ore tailings (IOTs) into supplementary cementitious materials (SCMs) is an effective approach to achieve value-added utilization of industrial solid waste. ... achieving 28.6 MPa at 7 days and 42.9 MPa at 28 days. The compressive strength of the TEA-activated sample at seven days was higher by 18.6%, 13.9%, 10%, …
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Compressive strength, durability, and resilient modulus of cement-treated magnetite and hematite iron ore tailings as pavement material ... and HIOT that contains 5 % Portland cement meet the minimum required UCS of 2.1 MPa (300 psi) after seven days of curing, which is recommended by Code No. 268, Portland Cement Association (PCA), and ...
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The laboratory experiments reveal the uniaxial compressive strength value of collected ore sample 98.09 Mpa with elastic modules of 79.113 Mpa and 0.12 Poisson ratios in sample no. 18 shown the ...
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Furthermore, a maximum compressive strength of 7.7 MPa was achieved for blocks after 28 days of air curing. Also, the addition of GGBS has reduced the water absorption and apparent porosity of the IOT blocks, confirming the positive interaction between IOT, GGBS and lime. ... Effects of iron ore tailings on the compressive …
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The compressive strength obtained after 3 days of curing in room temperature was 23.5 MPa. Then an experiment was carried out to evaluate a possible increase in compressive strength promoted by ...
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The iron ore tailings aggregates concrete exhibited a good mechanical strength and even in the case of compressive strength, there was an improvement of 11.56% over …
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Iron ore stands out as one of the main commodities in the global mining sector. Annually, an estimated production of around 2.4 billion tons of iron ore occurs worldwide (De Jesus and Joaquim 2020).In 2022, Brazil produced approximately 570 million tons of iron ore, generating 800 thousand direct jobs and 2 million indirect jobs, …
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Ordinary Portland cement has a strength class of 52.5 MPa at 28 d. Fly ash has a specific surface area of 6000 cm2/g. Slag powder has a specific surface area of 4500 cm2/g and …
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Ismail and Al-Hashmi conducted a sequence of experimental tests on the mechanical behavior of concrete made from abandoned iron ore tailings in Iraq, and the findings showed that it performed better than regular concrete and displayed greater compressive strength and flexural strength. Iron ore tailing (IOT) application as fine …
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Graphite ore and graphite tailings were blended into iron-tailings-based cementitious mortars, and their mechanical properties and microstructure were experimentally investigated. The flexural and compressive strengths of the resulting material were tested to compare the effects of graphite ore and graphite tailings as …
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F=The compressive strength (MPa) P=Maximum load (or load until failure) to the material (N) A=A cross-section of the area of the material resisting the load (mm2) Introduction Of Compressive Strength.
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The compressive strength and bulk density of the AAC increased with the increasing IOT admixture, and the compressive strength of the samples increased from 3.1 MPa to 4.1 MPa; meanwhile, the bulk density increased from 535 kg/m 3 to 640 kg/m 3, and all the AAC samples met the requirements of the standard specification (GB/T …
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The laboratory experiments reveal the uniaxial compressive strength value of collected ore sample 98.09 Mpa with elastic modules of 79.113 Mpa and 0.12 Poisson ratios in sample no. 18 shown the ...
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The actual iron ore has different shapes and sizes, according to the standard of the test for determing the uniaxial compressive strength of rock, the actual iron ore needs to be processed into a cylindrical shape, as shown in Fig. 2 (a).Therefore, the model used for DEM simulation should also be cylindrical, as shown in Fig. 2 (c) and (d), and …
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The uniaxial compressive strength of iron ore exhibits a linear increase with grade, ranging from 67.70 MPa at 28% grade to 105.09 MPa, 119.88 MPa, 136.13 MPa, and 156.87 MPa, respectively. The main differences in the mineralogical characteristics of the different iron ore grades are reflected in the chemical composition characteristics.
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The ultrasonic velocities and compressive strength of frozen and thawed iron ore are strongly influenced by the magnitude of porosity ami moisture content. The velocities …
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This study aims to broaden the application of iron ore tailing (IOT) in geopolymer. Fresh properties, residual strength, mass loss and microstructure evolution of geopolymer prepared by using fly ash as starting material blended with IOT and activated by sodium silicate and sodium hydroxide solutions were investigated after exposure to 3 …
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