Utilization of iron tailings as fine aggregates in low-grade cement concrete pavement

K, T; Pan, Bao; Sha, Dingguo; Lu, Jiale

doi:10.1088/1757-899x/479/1/012053

Cited by 8 publications

(8 citation statements)

References 8 publications

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“…Moreover, personal and property accidents can cause enormous losses 13–15 . Despite the technology in monitoring tailings reservoirs, accidents continue to occur; therefore, it is important to investigate routes to reuse this waste 16,17 …”

Section: Introductionmentioning

confidence: 99%

Experimental studies on flexural behavior of full iron tailings concrete beams

Ma,

Sun,

Zhang

et al. 2023

Structural Concrete

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Iron tailings have been extensively studied as mineral admixtures and as coarse and fine aggregates. However, few studies have been conducted on the mechanical properties of iron tailings concrete structures. Using iron tailings powder as an mineral admixture, and iron tailings gravel and sand as coarse and fine aggregates, respectively, the flexural behavior of full iron tailings concrete (FITC) beams was investigated experimentally. Compared with conventional concrete (CC) beam, we showed that the crack‐resistant, yield, and ultimate moments of FITC beams are similar to those of the concrete strain of FITC beams, which is in good agreement with the plane section assumption before cracks appear. The low elastic modulus of FITC makes the deflection of three FITC beams larger than that of a CC beam. The current design code of China is appropriate for calculating the load‐carrying capacity of FITC beam; however, the deflection calculation formula should be modified.

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Section: Introductionmentioning

confidence: 99%

Experimental studies on flexural behavior of full iron tailings concrete beams

Ma,

Sun,

Zhang

et al. 2023

Structural Concrete

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“…The bulk accumulation of iron tailings often brings problems such as environmental pollution, land occupation, and landslides [3,4]. Although there're certain prevention and detection methods for the storage yards of tailings [5,6], still, landslides occur from time to time, and the best solution to such problems is to develop and utilize iron tailings on a large scale. Concrete is one of the most widely used building materials, and the overexploitation of its raw materials [7], sand and stone, can cause severe damages to rivers and mountains [8].…”

Section: Introductionmentioning

confidence: 99%

Flexural Performance and Thermomechanical Coupling Analysis of Full-Iron Tailings Reinforced Concrete Beams

Ma¹,

Zhang²,

Sun³

2022

IJHT

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Problems such as carbonization, corrosion, and durability deterioration would occur to full-iron tailings reinforced concrete (FIT-RC) subjected to long-term use at high temperatures, to find solutions for these problems, it’s of important value to research the flexural performance of FIT-RC beam and its thermomechanical coupling mechanism. This paper proposed a calculation method for designing the flexural capacity and deflection of the normal section of FIT-RC beam, and summarized the high temperature relationship among thermal parameters, thermal stress, and thermal strain of FIT-RC material. In our experiment, four-point bending test was performed on the RC beams and the results showed that the bearing capacity of FIT-RC beam is equivalent to that of conventional reinforced concrete (CRC) beam, the failure modes of the two kinds of RC beams are basically the same. At high temperatures, the similarity of mechanical performance of concrete components with different reduction ratios is related to the similarity of temperature field. With the increase of heating time, the difference in the fire resistance grade of concrete components with different reduction ratios decreases to the minimum value. This study has clarified the high temperature relationship between thermal stress and thermal strain, and verified the feasibility of applying FIT to RC structures.

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“…China's cumulative stockpile of tailings reached 60 billion tons, including 475 million tons of IOTs based on the 2018-2019 Chinese development report. IOTs have become one of the most critical solid wastes in the world [9]. Their massive accumulation will not only cause land pollution, poor water quality, and aggravation of dust but also threaten human health [10].…”

Section: Introductionmentioning

confidence: 99%

“…The managers of mining enterprises need to spend more resources to maintain IOT ponds every year [11]. More seriously, the existence of tailing dams is a potential safety hazard, and the human life safety events caused by the tailings dam breaks around the world are increasing every year [9]. With extensive research on the recycling of IOT, the recycled IOT is classified into four categories at home and abroad: (i) extracting valuable metals in IOT [12]; (ii) used for a backfill material [13]; (iii) turned into a building material [14,15]; (iv) reclaiming farmland on the tailings dumping ground.…”

Section: Introductionmentioning

confidence: 99%

Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates

Zhang

et al. 2021

Materials

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Iron ore tailings (IOTs) are gradually used as building materials to solve the severe ecological and environmental problems caused by their massive accumulation. However, the bulk density of IOT as aggregate is too large, which seriously affects the concrete properties. Therefore, in this paper, the effect of hydroxypropyl methylcellulose (HPMC) on the workability, mechanical properties, and durability of concrete prepared from IOT recycled aggregate was studied. The action mechanism of HPMC on the workability and the mechanical properties of the IOT concrete was analyzed by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM). The results show that HPMC can effectively improve the segregation problem caused by the sinking and air entrainment of IOT aggregate and improve the crack resistance of concrete with little effect on its compressive strength and electric flux. These results are due to the air-entraining thickening effect of HPMC, which improves the slurry viscosity, hinders the sinking of aggregate, and improves the workability. At the same time, HPMC film, after concrete hardening, will bridge the slurry and aggregate through physical and chemical effects, hinder the propagation of microcracks, and improve the crack resistance.

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Utilization of iron tailings as fine aggregates in low-grade cement concrete pavement

Cited by 8 publications

References 8 publications

Experimental studies on flexural behavior of full iron tailings concrete beams

Experimental studies on flexural behavior of full iron tailings concrete beams

Flexural Performance and Thermomechanical Coupling Analysis of Full-Iron Tailings Reinforced Concrete Beams

Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates

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