coarse aggregate from coal mine for concrete

  • (PDF) Use of Coal Waste as Fine Aggregates in Concrete ...

    Coal waste has previously been utilized as coarse and fine aggregates in concrete with fibers (Karimipour et al. 2020) and without fibers (Karimaei et al.

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  • Utilization of coal gangue as coarse aggregates in ...

    Jan 25, 2021 · In this paper, coal gangue is utilized as a replacement of coarse aggregate in structural concrete. The effects of coal gangue on the mechanical properties of concrete material, circular reinforced concrete column and concrete-filled steel tubular column are experimentally studied and discussed in detail.

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  • Use of coal waste as fine aggregates on concrete blocks ...

    production of concrete blocks for paving using coal mine waste as fine aggregate. Concrete blocks were produced with coal waste replacing sand in 0%, 25%, 50%, 75%, and 100%. The compressive strength was evaluated in the concrete blocks at 7, 28, and 90 days. Static tests by acid-base accounting methods were carried out to evaluate the ...

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  • Aggregates for Concrete - Memphis

    The fine and coarse aggregates generally occupy 60% to 75% of the concrete volume (70% to 85% by mass) and strongly influ- ence the concrete’s freshly mixed and hardened proper- ties, mixture proportions, and economy. Fine aggregates (Fig. 5-1) generally consist of natural sand or crushed stone with most particles smaller than 5 mm (0.2 in.).

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  • The Potential Use of Waste Rock from Coal Mining for the ...

    高达12%返现 · Oct 26, 2020 · They met requirements in producing mortar and concrete. Another finding in this study is the waste rock with compressive strength of over 100 MPa was suitable for coarse aggregate for producing concrete. Finally, when using recycled aggregate from waste rocks of coal mining, it is possible to make concrete with compressive strength

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  • Utilization of coal gangue as coarse aggregates in ...

    Abstract In this paper, coal gangue is utilized as a replacement of coarse aggregate in structural concrete. The effects of coal gangue on the mechanical properties of concrete material, circular reinforced concrete column and concrete-filled steel tubular column are experimentally studied and discussed in detail.

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  • (PDF) Use of Coal Waste as Fine Aggregates in Concrete ...

    Coal waste has previously been utilized as coarse and fine aggregates in concrete with fibers (Karimipour et al. 2020) and without fibers (Karimaei et al. 2020), as well as the partial replacement ...

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  • Use of coal waste as fine aggregates on concrete blocks ...

    production of concrete blocks for paving using coal mine waste as fine aggregate. Concrete blocks were produced with coal waste replacing sand in 0%, 25%, 50%, 75%, and 100%. The compressive strength was evaluated in the concrete blocks at 7, 28, and 90 days. Static tests by acid-base accounting methods were carried out to evaluate the ...

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  • What Is Coarse Aggregate | Properties Of Coarse Aggregate ...

    Jun 22, 2021 · Coarse Aggregate Meaning. Aggregate which has a size bigger than 4.75 mm or which retrained on 4.75 mm IS Sieve are known as Coarse aggregate.. Origin Of Aggregates. The aggregates are generally acquired by blasting in stone quarries or breaking them by hand or by crusher machines.. The aggregates manufactured by machine-crushed consist of stones

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  • Valorization of calcined coal gangue as coarse aggregate ...

    Aug 01, 2021 · CG used in this paper was obtained in Huaibei mining area, Anhui Province, China. NA was selected as an experimental comparison. The particle sizes of both raw coal gangue aggregate (CGA raw) and NA were in range of 4.75–9.50 mm. Type P.II 52.5 Portland cement was provided by Onoda Co. Ltd., Nanjing. Table 1 reveals that the main chemical

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  • Advances and New Challenges for Recycled Aggregate Concrete

    Dec 03, 2021 · Moreover, the dynamic strength of concrete was improved with the addition of coal gangue fine or coarse aggregate; the incorporation of coal gangue coarse aggregate made the concrete shear surface smooth; and the given impacting pressure of the concrete with coal gangue coarse aggregate has greater particle breakage.

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  • coarse aggregate dry

    Coarse Aggregate - Its 5 [ Grading Shapes ] 13-04-2020 Aggregates Absorption: For applying a correction factor for aggregates in dry condition and determining water demand for concrete in saturated surface dry condition aggregates absorption is used and by weight, the aggregate can absorb water up to 2% and it can be high as 5% in some cases.

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  • recycled aggregate mining

    2020-10-26 Finally, when using recycled aggregate from waste rocks of coal mining, it is possible to make concrete with compressive strength of over 30 MPa. Besides, the flexural strength, bond strength between steel bar and concrete, modulus of elasticity, and shrinkage deformation of concrete at long-term ages are not too dissimilar to those ...

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  • Energy Absorption Characteristics of PVC Coarse Aggregate ...

    May 12, 2021 · In this paper, polyvinyl chloride (PVC) coarse aggregate with different mixing contents is used to solve the problems of plastic pollution, low energy absorption capacity and poor damage integrity, which provides an important reference for PVC plastic concrete used in the initial support structures of highway tunnels and coal mine roadway. At the same time, the

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  • Micro‐pore structure characteristics and macro‐mechanical ...

    concrete. They proved that if the coal gangue in Fuxin Gaode Mine was scientifically sorted out and used as coarse aggregate, PP fibre could be ‘combined’ to prepare concrete with excellent performance. Hongjiang et al. [9] designed ten groups of PP fibre spontaneous combustion coal gangue concrete specimens by

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  • ASTM C33 - Designation: C33/C33M− 18 Standard ...

    4.2.4 The appropriate limit for coal and lignite (seeTable 2 ). If not stated, the 1 % limit shall apply, 4.2 When the order is for coarse aggregate: ... TABLE 4 Limits for Deleterious Substances and Physical Property Requirements of Coarse Aggregate for Concrete N. OTE. 1—See Fig. 1 for the location of the weathering regions and

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  • Study on Strength and Durability of Concrete Containing ...

    This paper presents the results of experimental study on the effects of adhered mortar content on strengths and durability of concrete. Compressive, tensile and shear strengths, modulus of elasticity, drying shrinkage and carbonation were tested on concrete mixtures with the water cement ratio of 0.43, 0.50 and 0.60 using 3 kinds recycled coarse aggregate and a riversand.

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  • size of aggregate in concrete « BINQ Mining

    Apr 29, 2013 · The Role of Aggregate in Concrete Countertop Mixes – Tech Talk . 9 Dec 2006 In general, coarse aggregates tend to be about 10 times larger than the fine aggregates in concrete, but the range of sizes could be greater »More detailed

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  • Concrete - Wikipedia

    Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminum combined.

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  • aggregates stone

    2021-11-26 · The Recycled aggregates properties may be different accordingly types of concrete because the parent concrete was designed for its purposes such as permeable, durable and high strength concrete. Aggregate recycling is a simple process there is no complex method involved.

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  • Advances and New Challenges for Recycled Aggregate Concrete

    Dec 03, 2021 · Moreover, the dynamic strength of concrete was improved with the addition of coal gangue fine or coarse aggregate; the incorporation of coal gangue coarse aggregate made the concrete shear surface smooth; and the given impacting pressure of the concrete with coal gangue coarse aggregate has greater particle breakage.

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  • coarse aggregate dry

    Coarse Aggregate - Its 5 [ Grading Shapes ] 13-04-2020 Aggregates Absorption: For applying a correction factor for aggregates in dry condition and determining water demand for concrete in saturated surface dry condition aggregates absorption is used and by weight, the aggregate can absorb water up to 2% and it can be high as 5% in some cases.

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  • recycled aggregate mining

    2020-10-26 Finally, when using recycled aggregate from waste rocks of coal mining, it is possible to make concrete with compressive strength of over 30 MPa. Besides, the flexural strength, bond strength between steel bar and concrete, modulus of elasticity, and shrinkage deformation of concrete at long-term ages are not too dissimilar to those ...

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  • Influence of coal gangue aggregate grading on strength ...

    Jan 10, 2015 · This paper investigates the feasibility of using coal gangue as coarse and fine aggregates in concrete as well as how the coal gangue aggregate grading affects concrete properties. Nine mixed concrete samples were prepared with the value n in Fuller’s curve ranged from 0.44 to 0.68. The coal gangue aggregate with n = 0.62 shows the highest density, water

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  • Experimental Study on Dynamic Mechanical Properties of ...

    The results show that (1) it is feasible that employing coal gangue to replace natural coarse and fine aggregates in concrete can prepare C30 and C40 concrete; (2) the addition of coal gangue fine aggregate has a positive effect on the impact energy of the initial and final cracks of concrete, while the addition of coal gangue coarse aggregate ...

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  • Investigation on Anti-carbonation Performance of Coal ...

    With low water cement ratio (such as 0.35), anti-carbonization performance of calcined coal gangue coarse aggregate concrete is more significant than

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  • Casting samples for concrete properties | Download Table

    Use of Recycled Coarse Aggregate (RCA) in concrete can be described in terms of environmental protection and economy. ... properties of coal bottom ash (CBA) concrete have focused on concrete with ...

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  • Study on Mechanical Properties of PET Fiber-Reinforced ...

    When coal gangue is used to replace all concrete coarse aggregates, the compressive strength of coal gangue coarse aggregate concrete was reduced by 19.4% compared with that of plain concrete. As the percentage of coal gangue replacement increases, the axial compression failure mode of coal gangue coarse aggregate concrete will change from ...

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  • Materials | Free Full-Text | Low-Carbon and Fundamental ...

    Dec 07, 2021 · There is a lot of mature research on the production of recycled coarse aggregate from crushed concrete waste or reusing solid waste in the subgrade cushion [25,26]. ... Coal gangue is a kind of solid waste produced during coal mining, which contains an amount of carbon. The spontaneous combustion coal gangue used in this study had been stacked ...

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  • Mining Archives - Applied Concrete Solutions (ACS)Applied ...

    ACS Rapid Set Shotcrete. ACS Rapid Set Shotcrete is a pre-packaged multi-component cement based shotcrete mix for use in dry-mix processes. It is made with accurately mass-batched blends of Portland cement, silica fume, sand, coarse aggregate and powdered accelerator, and has been specifically designed for applications that require fast setting characteristics used in

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  • Study on Mechanical Properties of PET Fiber-Reinforced ...

    pressive strength of 28d coal gangue aggregate concrete can reach 37MPa, which meets the strength requirements of C30 ordinary concrete [16]. Qiu et al. [17] studied the influence of coal gangue coarse aggregate replacement rate on concrete freeze resistance and established a CGC freeze-thaw damage evolution model. They found that when the ...

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  • Alkali-Activated Coal Gangue-Slag Concrete

    the waste. Therefore this paper mainly studied the alkali-activated coal gangue-slag concrete (ACSC) was prepared by using the coal gangue-slag and Na2SiO3 and NaOH complex activator. The ratio of coal gangue (calcined and uncalcined) coarse aggregate replacing the gravel was 0%, 30%, 50%, 70%, and 100%.

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  • Study on application of spontaneous combustion coal gangue ...

    The results show that (1) it is feasible that employing coal gangue to replace natural coarse and fine aggregates in concrete can prepare C30 and

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  • US5772751A - Cement-bound light-weight insulating ...

    A light-weight concrete comprising cement, highly porous coarse and/or fine aggregates, such as furnace bottom-ash from thermal power stations or other porous natural or artificial materials, with a porosity of about 20-50% and an additive, preferably fly-ash from thermal power stations and other natural or artificial finely ground materials passing a 100 μm screen, and water.

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