Mechanical and Electroconductivity Properties of Graphite Tailings Concrete

Liu, Hongbo; Li, Ben; Xue, Jianming; Hu, Jianlong; Zhang, Jing

doi:10.1155/2020/9385097

Cited by 8 publications

(4 citation statements)

References 41 publications

(38 reference statements)

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“…There has been rare research on GT environment-friendly concrete. Liu et al [37][38][39][40][41][42] prepared GT concrete with high electrical conductivity, frost resistance, and mechanical properties. Kathirvel, P. et al [43] suggested that the optimal mechanical properties and durability can be obtained when GT are replaced by 40% volume content of sand.…”

Section: Comparison Of Gt and Sand Mesoscopic Picturesmentioning

confidence: 99%

Mechanical Properties and Mechanism Analysis of Graphite Tailings Environment-Friendly Concrete

Duan

Liu

et al. 2022

Materials

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The development of tailings in concrete technology is not only conducive to the realization of the goal of reducing carbon emissions, but also conducive to the inhibition the occurrence of shortages of sand and gravel supplies. In this study, graphite tailings were used to replace sand in the range of 0~100%, and the mechanical mechanism of graphite tailings concrete was examined through compressive and flexural tests. The mechanical experimental results were evaluated and verified based on concrete macroscopic failure appearance, mesoscopic failure appearance, and physical characteristics of graphite tailings. The results revealed that the concrete strength increases first and then decreases with the increase of the graphite tailings content. Compared to GT00 (GT00 is a specimen with a graphite tailings content of 0%, and so on), GT10~GT60 exhibited better mechanical properties, of which 30% was recommended as the optimal replacement rate. The mechanical properties of GT10 and GT20 had an upward trend, and GT30 had low spalling, with aggregate fragmentation found on the fracture surface. GT30 showed the best resistance to bending and deformation. The mechanical properties of GT40~GT60 had a downward trend. When the graphite tailings content was higher than 70%, the interface defects of the aggregate matrix increased, thus making it easier for cracks to propagate along the interface. Furthermore, the mechanism of graphite tailings replacing sand verified the test results from different perspectives, which provides new analysis ideas for other tailings in environment-friendly concrete.

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Section: Comparison Of Gt and Sand Mesoscopic Picturesmentioning

confidence: 99%

Mechanical Properties and Mechanism Analysis of Graphite Tailings Environment-Friendly Concrete

Duan

Liu

et al. 2022

Materials

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“…Chloride penetrates concrete, destroys steel passive flm, and causes steel corrosion [23][24][25]. In recent years, Hong-Bo et al [26][27][28][29][30] studied the infuence of graphite tailings on the properties of cementbased materials and concrete blocks. Te results show that the mechanical properties of cement-based materials can be improved by adding an appropriate amount of graphite tailings.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Graphite Tailings RC Beams in Chloride Environment

Bo-ya

zhu

Xia

et al. 2023

Advances in Civil Engineering

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This paper investigates the mechanical properties of graphite tailings concrete beams under various curing environments. The results show that the concentration of graphite tailings has an important influence on the mechanical properties of concrete. Finally, the bending characteristics of the beam and the modified bearing capacity calculation formula are obtained, which provides a theoretical basis and the reference value for the construction of green building materials. Through research, the main innovations and main findings of this paper are as follows: (1) In the three kinds of concrete experimental environment, the fracture load and ultimate load of concrete beams with graphite tailings replacement rate of 20% are the largest. (2) In the three kinds of concrete test environment, when the concrete test beams under the same load, with the increase of graphite tailings replacement rate, the mid-span deflection of concrete beams showed a trend of decreasing first and then increasing. When the replacement rate of graphite tailings sand is 20%, the mid-span deflection of the test beam is the smallest. (3) Through experiments, it is found that the normal section bearing capacity of graphite tailings concrete beams after chloride salt erosion conforms to the plane section assumption. After chlorine salt erosion, the strain of the longitudinal tensile steel bar of concrete beams with different graphite tailings sand replacement rates is the same as that of ordinary concrete beams, and the slope of the strain curve is the same, showing a linear trend. The experimental results show that the replacement rate of graphite tailings sand has an insignificant effect on the strain of steel bars. (4) The Gauss function is used to fit the experimental value of normal section bearing capacity of concrete beam, and the calculation formula of normal section ultimate bearing capacity of graphite tailings sand concrete beam under chloride environment is established. The research results of this paper have significant reference value for the study of mechanical properties of graphite tailings sand concrete components.

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“…Simultaneously, as a nonrenewable resource, which plays a vital role in modern economic development. Consequently, the amount of graphite mined increases each year, leading to a considerable production of low-grade graphite ore and graphite tailings [ 1 ]. The flotation process is commonly used in the production of graphite, with each ton of graphite requiring 100 tons of water and 10 tons of raw graphite ore on average.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Iron-Tailings-Based Cementitious Mortars with Incorporated Graphite Ore and Graphite Tailings: Strength Properties and Microstructure

et al. 2023

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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 supplementary cementitious materials and fine aggregates on the mechanical properties of iron-tailings-based cementitious mortars. Additionally, their microstructure and hydration products were mainly analyzed using scanning electronic microscope and X-ray powder diffraction techniques. The experimental results showed that the mechanical properties of the mortar material incorporating graphite ore were reduced due to the lubricating properties of graphite ore. As a result, the unhydrated particles and aggregates were not tightly bound to the gel phase, making the direct application of graphite ore in construction materials unfeasible. In the iron-tailings-based cementitious mortars prepared in this work, the optimal incorporation rate of graphite ore as a supplementary cementitious material was 4 wt%. The compressive strength of the optimal mortar test block after 28 days of hydration was 23.21 MPa, and the flexural strength was 7.76 MPa. The mechanical properties of the mortar block were found to be optimal with a graphite-tailings content of 40 wt% and an iron-tailings content of 10 wt%, resulting in a 28-day compressive strength of 48.8 MPa and a flexural strength of 11.7 MPa. By observing the microstructure and XRD pattern of the 28-day hydrated mortar block, it was determined that the hydration products of the mortar with graphite tailings as an aggregate included ettringite, Ca(OH)2, and C-A-S-H gel.

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Mechanical and Electroconductivity Properties of Graphite Tailings Concrete

Cited by 8 publications

References 41 publications

Mechanical Properties and Mechanism Analysis of Graphite Tailings Environment-Friendly Concrete

Mechanical Properties and Mechanism Analysis of Graphite Tailings Environment-Friendly Concrete

Flexural Behavior of Graphite Tailings RC Beams in Chloride Environment

Comparative Study of Iron-Tailings-Based Cementitious Mortars with Incorporated Graphite Ore and Graphite Tailings: Strength Properties and Microstructure

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