A properly designed mixture possesses the desired workability for the fresh concrete and the required durability and strength for the hardened concrete. Typically, a mix is about 10 to 15 percent cement, 60 to 75 percent aggregate and 15 to 20 percent water. Entrained air in many concrete mixes may also take up another 5 to 8 percent.Web
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T : Proportion of concrete mix with iron ore tailings. Proportion of iron ore tailings (%) Iron ore tailings (kg) Naturalsand(kg)Flyash(kg)Cement(kg)Crushedstone(kg)Water(kg)Water-reducing agent (kg) . . . . Slump 0 50 100 150 200 Slump (mm) 0 25 35 45 Proportion (%) Residual value of 1 h slump (a) Slump of the rst group 0 50 100 150Web
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Concrete is the basic material in all construction works and fine aggregates constitute nearly 30-40% of the mix. But the procurement and generation of natural fine aggregates, i.e., sand is ...Web
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The major aim of this study is to evaluate IOT as replacement for river sand in concrete and compare with the result of conventional concrete. Concrete mixtures containing 25%, 50%, 75% and IOT as river sand replacement were prepared with 0.5 water-to-cement ratio (W/C). Compressive and splitting tensile strengths, modulus of …Web
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Carbon capture and utilization for concrete production (CCU concrete) is estimated to sequester 0.1 to 1.4 gigatons of carbon dioxide (CO2) by 2050. However, existing estimates do not account for ...Web
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Experimental investigations were conducted to study the compressive strength, physical, mechanical and fresh property of concrete containing iron-ore waste. During the experiment, concrete cubes were prepared with 10- composition of iron ore waste to evaluate their compressive strength.Web
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Iron: compressive strength of concrete: The mix design ratio of 1:2:3 (cement:fine aggregates:coarse aggregates) 33.12 (ref. concrete) 36.95 (tailings concrete) ... Synthetic gravel for concrete obtained from sandy iron ore tailing and recycled polyethyltherephtalate. Constr. Build. Mater., 151 (2017) ...Web
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In this study, the potential of converting iron ore tailings (IOTs) into sustainable building materials was explored. IOTs were combined with fly ash (FA) and ground granulated blast-furnace slag (GGBFS) to prepare IOTs-based supplementary cementitious materials (SCMs). A concrete mix using IOTs-aggregate was also …Web
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in concrete. The iron ore tailings aggregates concrete exhibited a good mechanical strength and even in the case of compressive strength, there was an improvement of ... A concrete mix design of grade 40 MPa with a water–cement ratio of 0.5 and a mix design ratio of 1:2:3 (cement:fine aggregates:coarse aggregates) was prepared in the ...Web
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In this paper self-compacting concrete is prepared by partially replacing cementitious material by red mud (RM) and in the same mix partially replacing sand by iron ore tailings. Cementitious material in the mixture …Web
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The mix with only sand as fine performed tests on permeability, frost resistance, and aggregate served as the control mix, while sand was carbonation resistance for the concrete specimens with replaced in the other mixes with 5, 10, 15, and 20% of an optimal amount of iron ore tailings, and the iron ore tailings (IOT).Web
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The bulk of the cement industry's environmental burden is from the calcareous source. Calcium is mostly available naturally as limestone (CaCO 3), where almost half of the mass is eventually released as CO 2 during clinker manufacture. Iron (Fe) is the fourth most common element in the Earth's crust surpassed only by oxygen, silicon, and …Web
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The disposal of industrial by-product tailings has become an important issue in solving environmental pollution. In this study, 15%, 30%, 50%, and 70% iron tailings were used to replace the natural sand in concrete, and 1.5% steel fiber and 0–0.75% PVA fibers were added to the iron tailings concrete. The effects of the iron tailings replacement …Web
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In this study, the potential of converting iron ore tailings (IOTs) into sustainable building materials was explored. IOTs were combined with fly ash (FA) and ground granulated blast-furnace slag (GGBFS) to prepare IOTs-based supplementary cementitious materials (SCMs). A concrete mix using IOTs-aggregate was also …Web
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The ground granulated blast furnace slag (GGBFS) is a by-product of iron manufacturing which when added to concrete improves its properties such as workability, strength and durability. This material is obtained by the heating of iron ore, limestone and coke at a temperature about 1500 degree Celsius. The process is carried out in a blast furnace.Web
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GGBS (Ground Granulated Blast-furnace Slag) is a by-product of iron manufacturing which is used as a cementitious material used in concrete. GGBS is obtained by the heating of iron ore, limestone and …Web
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concrete whereby sand is the fine aggregate, while the other mixes were partially replaced by 20- of iron ore tailing (IOT). Moreover, results from their experiment showed that concrete workability decreases with increasing percentage of iron ore tailing in the mixture. At 20% replacement of aggregate (in concrete) with iron ore tailings, itWeb
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The concrete with 10% glass powder & 30% iron ore tailings showed a higher strength compared to the conventional mix for 28 days. Concrete mix containing 10% GP and 30% IOT showed higher flexural strength of 5.05 MPa for 28 days. Splitting tensile strength value is also increasing i.e., for 10% glass powder and 30% IOT, …Web
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Conventional fine aggregate (river sand) was replaced with 30% volume of iron ore tailings that had passed through the 600-micron sieve to achieve this. The sieved IOT used in the concrete mix can be seen in Fig. 2, while Fig. 3 shows the gradation curve for the material. 2.1.4. Chemical admixtureWeb
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Cement is the main basic ingredient of ready-mix concrete. Cemex is among the leading cement companies for high-quality bagged and branded cement products. Cement is a fine powder, obtained from the calcination at 1,450°C of a mix of limestone, clay, and iron ore. The product of the calcination process is clinker—the main ingredient of ...Web
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In applications of concrete for shielding against hazardous radiation or for being used as counterweight, as well as in various other applications that involve the use of heavyweight concrete, the most significant method of mix design involves the use of heavyweight aggregates. Concrete mixes that were produced for this work contained …Web
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The objective of this study is to evaluate the modified performance of concrete with mixing of iron ore tailings in order to solve the shortage of natural sand and make full use of industrial waste.Web
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The iron ore tailings (IOTs) (<0.5 mm) were purchased from Laizhou Iron Mine in China. Main chemical composition of IOTs are shown in Table 1. ... to prepare IOTs-based supplementary cementitious materials (SCMs). A concrete mix using IOTs-aggregate was also prepared. The aim was to address the challenge of producing high …Web
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In Brazil, large quantities of iron ore tailings (IOT) are produced as a result of iron mining, which may affect the environment negatively. This work evaluated the use of IOT in hot mix asphalt type C (HMA-C). For this purpose, IOT was incorporated as a filler (at 1% in relation to the total mass of HMA-C).Web
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Sustainable handling of iron ore tailings is of prime concern to all stakeholders who are into iron ore mining. This study seeks to add value to the tailings by utilising them as a …Web
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Three kinds of concrete (ordinary concrete, concrete with iron tailings sand (ITS), and concrete with ITS modified by polypropylene fibers) were exposed to drying-wetting cycles in 5% Na2SO4 ...Web
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The optimum compression strength is achieved for the mix containing 10% iron ore tailings. After the beneficiation of iron ore, the waste is generated, which arise many environmental issues for both living and nonliving components. ... The findings indicate that concrete with 35% iron ore tailings replacement performs similarly to …Web
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Lei Zhang Add to Mendeley https://doi/10.1016/j.jobe.2023.106585 Get rights and content Highlights • Cement and aggregate can be simultaneously replaced in …Web
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In all concrete mixes produced, water/cement ratio, cement content, and the maximum aggregate size of the aggregates properties, the best performances were obtained when iron ore was used, while ...Web
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Presence of silica along with oxides of iron, alumina, and other trace minerals indicates their potential as aggregate for mortar and concrete [56, 57]. replacement of fine aggregate with iron ore tailings drastically reduced the workability and compressive strength of concrete, whereas the mechanical behaviour of tailing mix was similar ...Web
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The results of dry density of hematite iron ore concrete mix. are recorded in Table 4. 2.2.3. Coupon and proctor densities. Dry densities obtained for Coupon samples; usually the sam-Web
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Iron ore tailings are a common type of hazardous solid waste in China and have caused serious environmental problems, and the high cost of producing ultra-high performance concrete (UHPC) provides ...Web
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Concrete containing iron ore tailings (IOT) enhances compressive and splitting strengths. IOT concrete improves durability properties and resists carbonation. …Web
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Concrete containing iron ore tailings (IOT) enhances compressive and splitting strengths. IOT concrete improves durability properties and resists carbonation. IOT as sand replacement in concrete reduces cost and environmental problems. Millions of tons of iron ore tailings (IOT); a by-product of iron ore processing, are disposed of every year ...Web
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A comparative study on the Optimum percentage replacement with iron ore tailings Using this material to replace and cement in a concrete mix, in various percentages from 5% up to 30%, curing for a period of up to 90 days in the process, the material was found to have similar characteristics with that of pozzolana, one of which was that the ...Web
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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 …Web
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For example, the content of SiO 2 in phosphate tailings is 2.1, in contrast to the 75.23 in iron ore tailings. Even if there were all lead-zinc tailings or iron ore tailings, the variation content of SiO 2 is 15.50-69.92 in the lead-zinc tailings or 24.19-75.23 in the iron ore tailings. As a result, if tailings are only classified according to ...Web
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The optimum compression strength is achieved for the mix containing 10% iron ore tailings. After the beneficiation of iron ore, the waste is generated, which arise many environmental issues for both …Web
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