Foundation Research on Physicochemical Properties of Mine Insulation Materials

Hou, Chuanbin; Song, Xianfeng; Zhang, Long; Liu, Shangxiao; Zhang, Xiao

doi:10.3390/coatings10040355

Cited by 11 publications

(7 citation statements)

References 13 publications

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“…Hou prepared mineral thermal insulation materials with basalt fiber and evaluated the thermal conductivity and compressive strength of the prepared samples. The results show that the samples containing basalt fiber have a good thermal insulation effect and meet the compressive strength requirements [35]. Xiaoqi Li found that basalt fiber could improve the mechanical properties of composites [36].…”

Section: Scholar Materials Thermal Conductivity (W/(m•k)) Compressive...mentioning

confidence: 88%

Research on New Solid Waste Heat Insulation Material for Deep Mining

Wen

Zheng

2023

Minerals

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The global demand for mineral resources has led to the gradual transformation of the mining industry from the traditional shallow, small-scale mining mode to the high-intensity mining of deep underground mines. Due to the high stress, high temperature, high permeability, and easy disturbance of deep mines, new challenges have been brought to the mining of materials. Some scholars have improved the thermal insulation performance of concrete by adding low thermal conductivity materials such as ceramsite, shell, and natural fiber to traditional shotcrete, but there are still high costs, insufficient support strength, and unsatisfactory thermal insulation effects. Given the background related to the fact that it is still not possible to fully recycle the large amount of solid waste generated by mining activities, this paper, with traditional shotcrete as its basis, uses coal fly ash to replace part of the cement and tailings to replace part of the sand and gravel aggregate. In addition, it adds basalt fiber to reduce thermal conductivity and restore strength. An orthogonal experiment of three factors and three levels was designed to explore a new type of solid waste-based thermal insulation support shotcrete material. Through the testing and analysis of the mechanical and thermal properties of the specimens, it was concluded that the optimal ratio of the materials was 45% fly ash, 50% tailings, and 25% basalt fiber (the percentage of the total mass of fly ash and cement). The compressive strength of the specimens after curing for 28 days could reach 16.26 MPa, and the thermal conductivity and apparent density were 0.228561 W/(m·k) and 1544.00 kg/m3, respectively. By using COMSOL Multiphysics multi-physics coupling software to analyze the coupling of the stress field and temperature field, it was concluded that the optimum thickness of the thermal insulation layer of this material was 150 mm. The field application in a mine in Shandong Province proved that it met the effects of thermal insulation (the ability to isolate heat conduction) and support. The successful trial of this material provides a new idea for the solving of the problem of heat damage and solid waste utilization in deep mines, which has a certain practical significance.

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Section: Scholar Materials Thermal Conductivity (W/(m•k)) Compressive...mentioning

confidence: 88%

Research on New Solid Waste Heat Insulation Material for Deep Mining

Wen

Zheng

2023

Minerals

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“…(8) There was no internal heat source in the alleyway. (9) The constant temperature, regarded as the virgin rock temperature, was applied to the far-field boundary condition.…”

Section: Assumptions and Boundary Conditionsmentioning

confidence: 99%

Performance Test and Thermal Insulation Effect Analysis of Basalt-Fiber Concrete

Zhang

Song

2022

Materials

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This paper examines the feasibility of applying inorganic thermal-insulating concrete in high geothermal roadways in underground coal mines. This innovative material is based on a mixture of ceramsite, glazed hollow beads, cement, and natural sand, enhanced with varying degrees of basalt fibers. Fibers were used as a partial substitute in the mixture, in the following volumes: 0% (reference specimen), 5%, 10%, 15%, and 20%. Their compressive strength, permeability resistance, and thermal conductivity were studied. A high content of fibers tends to entangle into clumps during mixing, resulting in a significant reduction in the mechanical properties of compressive strength. The appropriate amount of fiber content can improve impermeability, and the permeability height of 5% fiber concrete was reduced by 22.5%. Experiments on thermal behavior showed that an increase of basalt fibers leads to a significant reduction in thermal conductivity. For concrete containing 20% fiber, the thermal conductivity for the reference specimen (0%) in the wet state was reduced from 0.385 W/(m∙°C) to 0.098 W/(m∙°C). There was a slight increase in thermal conductivity when the temperature increased from 30 °C to 60 °C. Despite the reduced mechanical strength, the resulting concrete is well-suited for use in the insulation of underground roadways, as numerical simulations showed that insulating concrete with optimal fiber content (15%) can reduce the average temperature of the wind flow in a high ground temperature roadway of 100 m in length in a mine by 0.3 °C. The final cost-benefit analysis showed that insulating concrete has more economic benefits and broad development prospects when applied to high geothermal roadway cooling projects.

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“…Due to the particular environment of underground tunnels, most of the applied insulation materials are based on inorganic concrete with good insulation properties, low density, and suitability for underground spraying and support [7,8]. Inorganic fiber concrete has a low thermal conductivity and good mechanical properties, which can reduce the tunnel cooling load and contribute directly to the energy economy [9].…”

Section: Introductionmentioning

confidence: 99%

Performances of Heat-Insulating Concrete Doped with Straw Fibers for Use in Tunnels

et al. 2023

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Current research efforts aim to develop insulating building materials to cope with hot tunnels by using crop straw fibers. The amount of straw fiber incorporated included different percentages of the gelling material mass: 0% (reference specimen), 2.5%, 5%, 7.5%, and 10%. The study focused on the concrete’s compressive strength, permeability, and thermal coefficient. The thermal coefficient of dry concrete decreased with increasing fiber content. However, the porosity of concrete mixed with more straw fibers increased, thus decreasing compressive strength. Concrete with a fiber content of 7.5% had the best overall performance, and it had a low thermal conductivity (0.158 W/(m·k)). According to COMSOL simulation results, the tunnel wind flow temperature of concrete with 7.5% fiber content was lower than the tunnel wind flow temperature of plain concrete. Thus, the obtained straw fiber heat-insulating concrete is a promising candidate material for tunnel insulation.

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Foundation Research on Physicochemical Properties of Mine Insulation Materials

Cited by 11 publications

References 13 publications

Research on New Solid Waste Heat Insulation Material for Deep Mining

Research on New Solid Waste Heat Insulation Material for Deep Mining

Performance Test and Thermal Insulation Effect Analysis of Basalt-Fiber Concrete

Performances of Heat-Insulating Concrete Doped with Straw Fibers for Use in Tunnels

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