A comparative study on the practical utilization of iron tailings as a complete replacement of normal aggregates in dam concrete with different gradation

Lv, Xingdong; Shen, Weiguo; Wang, Lei; Dong, Yun; Zhang, Jianfeng; Xie, Zhiqiang

doi:10.1016/j.jclepro.2018.11.107

Cited by 81 publications

(29 citation statements)

References 30 publications

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“…e parameter indexes are shown in Table 1. e apparent density and bulk density of the ITS are obviously higher than those of NS due to the high iron phase minerals in the ITS, which corresponds to the finding by Lv et al [8] that ITS has a higher specific gravity range from 265 to 340 compared with NS.…”

Section: Raw Materials and MIX Ratiossupporting

confidence: 82%

“…Many scholars regard iron tailings sand as a fine aggregate in concrete, which not only solves the pollution problems but also provides raw materials for construction [4][5][6][7]. Lv et al [8], Umara Shettima et al [9], and Cheng et al [10] found that the strength of concrete with iron tailings basically meets the requirements and is higher than that of ordinary concrete.…”

Section: Introductionmentioning

confidence: 99%

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The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

Tang

Mao

et al. 2020

Advances in Materials Science and Engineering

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This paper aimed to explore the performance of concrete with iron tailings sand modified by polypropylene fibers under aggressive environment. 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 solution for 28, 56, 84, 112, and 140 days. The performance, such as pores distribution, crack width, corrosion products, mass variation, expansion variation, compressive strength, flexural strength, and the diffusion of sulfate ion were measured at regular time intervals during the whole exposure period to describe the associated evolution laws. The results show that, in the process of the corrosion of sodium sulfate solution, the formation of gypsum and ettringite (AFT) has an important impact on the harmful pores (>0.1 μm), cracks, mass variation, expansion variation, compressive strength, and flexural strength of the three concrete. Polypropylene fibers can refine the pores development and inhabit the crack development of the concrete with ITS, further alleviating the rate of sulfate ion attack on concrete and the rate of increase of corrosion products, so that the mass variation, the expansion variation, and the reduction of compressive strength and flexural strength can be limited effectively. Furthermore, in the concrete with ITS modified by 0.1% polypropylene fibers, the content of sulfate ions diffused is always the lowest.

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Section: Raw Materials and MIX Ratiossupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

Tang

Mao

et al. 2020

Advances in Materials Science and Engineering

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“…For example, the compressive strength of mortar with 100% tailings as a fine aggregate was 13% higher than that for the control specimen [26], whereas the percentage increase of concrete compressive strength relative to control was 10.2% for 75% tailings substitution at 28 days. Lv et al [43] came to a similar conclusion to Fontes' research.…”

Section: Effect On Hardened Propertiessupporting

confidence: 61%

Utilization of tailings in cement and concrete: A review

Gou

Zhou

Then

2019

Science and Engineering of Composite Materials

147

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One of the advantages of cement and the cement concrete industry in sustainability is the ability to utilize large amounts of industrial solid wastes such as fly ash and ground granulated blast furnace slag. Tailings are solid wastes of the ore beneficiation process in the extractive industry and are available in huge amounts in some countries. This paper reviews the potential utilization of tailings as a replacement for fine aggregates, as supplementary cementitious materials (SCMs) in mortar or concrete, and in the production of cement clinker. It was shown in previous research that while tailings had been used as a replacement for both fine aggregate and cement, the workability of mortar or concrete reduced. Also, at a constant water to cement ratio, the compressive strength of concrete increased with the tailings as fine aggregate. However, the compressive strength of concrete decreased as the replacement content of the tailings as SCMs increased, even whentailings were ground into smaller particles. Not much research has been dedicated to the durability of concrete with tailings, but it is beneficial for heavy metals in tailings to stabilize/solidify in concrete. The clinker can be produced by using the tailings, even if the tailings have a low SiO2 content. As a result, the utilization of tailings in cement and concrete will be good for the environment both in the solid waste processing and virgin materials using in the construction industry.

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“…Limited by science and technology, the overall utilization rate of tailings is not high at present; nearly 78% of the tailings are piled on the surface, resulting in a considerable waste of resources. The main use of tailings is to prepare filling materials and building materials, especially coarse-grained iron tailings can be used as an aggregate to prepare filling materials and concrete, iron tailings can be used as a kind of machine-made aggregate, and the performance of filling materials and concrete is good (Lv et al, 2019;Qi and Fourie, 2019;Protasio et al, 2020;Karthikeyan et al, 2021;Leong, 2021). Some tailings are used to prepare the concrete of mine pillars; the concrete has good mechanical properties by means of fiber reinforcement (Cao et al, 2020;Cao et al, 2021a;Cao et al, 2021b).…”

Section: Introductionmentioning

confidence: 99%

Effect of Iron Tailings and Slag Powders on Workability and Mechanical Properties of Concrete

Shen

Liu

et al. 2021

Front. Mater.

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Tailings are one of the largest solid wastes in stock at present. In order to improve the comprehensive utilization rate of tailings, especially to solve the problems of fine-grained tailings treatment, the concrete composite admixture was prepared by using iron tailings powder and slag powder. In order to study the influence of iron tailings powder on the workability and long-term mechanical properties of concrete, C30 and C50 concrete with different iron tailings powder dosages were prepared, and the slump, expansion, flexural strength, splitting tensile strength, and compressive strength of concrete at different ages were tested. The results showed that the proper addition of iron tailing powder is beneficial to the working performance of concrete and can effectively reduce the time-loss of concrete fluidity. When the content of iron tailings powder in the composite admixture is 50%, the 1080d long age strength of C30 and C50 concrete can reach 50.3 and 80.7 MPa. Based on the 28d compressive strength, the relative strength-age prediction model of iron tailings powder concrete was established. The calculation and experimental results show that the model can accurately predict the compressive strength of micro-powder concrete of iron tailings at long age, and the error rate is less than 1%. The results lay a theoretical foundation for the utilization of iron tailings in concrete.

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A comparative study on the practical utilization of iron tailings as a complete replacement of normal aggregates in dam concrete with different gradation

Cited by 81 publications

References 30 publications

The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

The Concrete Performance with Iron Tailings Sand Modified by Polypropylene Fibers under Aggressive Environment

Utilization of tailings in cement and concrete: A review

Effect of Iron Tailings and Slag Powders on Workability and Mechanical Properties of Concrete

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