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In order to study the feasibility and sand substitution mechanism of cement mortar mixed with iron ore tailings (IOT), iron ore tailings cement mortars (referred to as IOTC) with IOT content of 0%, …
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Currently, approximately 1.4 billion tons per year of iron ore tailing wastes (IOT) are generated, mainly in Australia, Brazil, and China. This work describes the characterization and application ...
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Buildings 2023, 13, 149 2 of 21 progress has been made in this field. IOT sand was first used by Huang et al. [12] as a mortar fine aggregate to make iron ore tailings cement mortar (IOTC), and ...
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In this study, the mechanochemical activation method is adopted to process (mainly by pulverising) the siliceous iron tailings sample. The grain size distribution curves of the sample after pulverising are shown in Fig. 2, and the sample's median diameter (d 50) and specific surface area (SSA) are shown in Table 2.It can be seen from Fig. 2 and …
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This study seeks to add value to the tailings by utilising them as a replacement for aggregates in concrete. A concrete mix of grade 40 MPa was prepared in the laboratory with water–cement ratio of 0.5. The concrete were cured for 1, 2, 3, 7, 14 …
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Mixed with sand and cement, tailings can be employed in the construction industry to provide floor or retaining wall support. As a result of the mineralogical characterization of clay-rich tailings, it can be considered as a primary input material for manufacturing bricks, floor tiles, cement, porcelain, and vitreous ware, especially …
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The preparation and performance testing of concrete containing iron mine tailings have made some progress in recent years, owing to efforts by domestic and international academics.
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1. Introduction. Iron tailings are a type of solid waste produced during the separation of valuable metals from iron ores [1].Iron tailings are the primary mine solid waste in China, with reserves of nearly 5 × 10 3 million tons and a steady annual growth rate of over 30 million tons [2].Generally, iron tailings are deposited in tailing dams, …
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The test results show that iron tailings powder is beneficial to improve the workability, and the strength of concrete decreases with the increase of iron tailings powder content, while the ...
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Besides its solid nature, the iron fillings gave greater strength to the concrete due to its angular texture which actively fills the voids thereby enhancing the mechanical properties [17].
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The findings indicate that concrete with 35% iron ore tailings replacement performs similarly to natural sand concrete and it can be used in engineering. Xiaoyan et al. experiments examined how IOT size affects plastic viscosity of mortar and tensile characteristics. Mortar using IOTs as aggregates can achieve tensile and compressive …
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The physical and chemical properties of tailings used as fine aggregate in concrete directly affect the mechanical properties of concrete. The most important of them are particle size distribution, fine material content, porosity, water absorption, density, …
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Therefore, the filtered tailings used herein are termed 80/20 and were generated with moisture content values ranging from 12 to 18%. The grain size distribution of the 80/20 tailings used is highlighted in Fig. 1.Table 1 summarizes the main physical characteristics of the iron ore tailings. According to the Unified Soil Classification …
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The iron tailings concrete (ITC) is prepared and tested by performance tests to evaluate its mechanical properties (compressive strength, flexural strength and flexural modulus) and durability (abrasion resistance, water absorption, shrinkage ability and frost resistance). The results show that all the indexes can meet the requirement of rural ...
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In the present study Iron Ore Tailings (IOT) procured from Kudremukh Lakya Dam site (KIOCL Ltd.) are used as partial replacement to fine aggregates at levels of 10, 20,30,40,50 percent
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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, …
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by using iron tailings to completely replace natural sand, whereas that of concrete with a low water/cement ratio had a slightly decrease. For ultra-high strength concrete, the iron tailings had little eect on concrete strength when its content was less than 20%, beyond this content, the strength decreased almost linearly (Zhao et al., 2014).
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For iron tailings sand concrete, the use of SAP, SRA and CPFL could also increase the internal RH of concrete, albeit to a different extent. More specifically, the application of CPFL increased the internal RH of concrete remarkably, while lower effects of SRA and SAP on internal RH could be identified. Furthermore, no significant …
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The aim of this review is to re-assess the potential utilization of tailings for cement clinker production and the opportunities and challenges of using tailings as aggregate or supplementary cementitious materials (SCMs) in cement and concrete, so …
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Influence of Iron Tailings Powder on Concrete Performance. C30 and C50 concrete with different iron tailings powder contents were prepared according to the mix ratio, and the slump and dilatancy of each group of concrete at the time of discharge and 1 h after discharge were tested, respectively. The specific data are shown in Table 7.
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2.1.1. Portland Cement and Iron Tailings The Portland cement (PC) used in this test is P.O. 42.5, purchased from Kangda Company in Wuhan, China. Iron tailings (IT) were collected from Hanyang ...
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The need for low-cost raw materials is driven by the fact that iron ore tailings, a prevalent kind of hazardous solid waste, have created major environmental issues. Although many studies have focused on using iron ore tailing (IOT) in concrete and have reported positive results, readers may find it difficult to accurately assess the …
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The scope of this work is to study the utilization of iron ore tailings in manufacture of concrete paving blocks. Five reference mixes were prepared using cement, jelly dust and baby jelly. Ten ...
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The iron tailings concrete (ITC) is prepared and tested by performance tests to evaluate its mechanical properties (compressive strength, flexural strength and flexural modulus) and durability (abrasion resistance, water absorption, shrinkage ability and …
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2.1 Test Raw Materials (1) Cement: adopt Shaanxi Tongchuan Shengwei P·O 42.5 grade. (2) admixture: fine powder fineness of iron tailings is 25.9%, mobility ratio is 99%; Fly ash obtained from Tongchuan Huaneng Power Plant Grade II fly ash, fineness of 21.3%, water requirement ratio of 97%; The fineness of limestone powder is 24.8%, …
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Cement and aggregate can be simultaneously replaced in concrete with iron ore tailings of various particle sizes. The mechanical properties and durability of concrete based on iron ore tailings are excellent.
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vated bricks were created with iron ore tailings replacement levels of between 40 and 90%, in increments of ten percent. Results revealed that bricks with 40% iron ore tailings replacement performed better in terms of strength and durability, and that this improvement decreased as iron ore tailings ratio increased.
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This research investigates the effects of iron tailings content on the mechanical properties and durability of concrete under dry–wet cycling and negative temperature conditions (−10 °C), where …
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We report a type of high-magnesium and low-silicon iron ore tailings (IOT) utilized as a raw material replacing clay to produce cement clinkers by conventional sintering process. Properties of the cement clinkers sintered at 1420 °C with different IOT addition, from 0 to 20 wt%, were investigated.
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carded iron tailings to make concrete, which can not onl y . solve a series of problems caused by the accumulation of . iron tailings, but also meet the needs of building structures .
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