coal gangue aggregate

  • Utilization of Coal Gangue Aggregate for Railway Roadbed ...

    Utilization of Coal Gangue Aggregate for Railway Roadbed Construction in Practice. Sustainability 2020, 12(11), 4583; ... Please add some more description of coal gangue, such as its source, engineering properties, engineering applications in other fields or projects.

  • Evaluation of HMA with Coal Gangue Coarse Aggregate ...

    Coal gangue is the waste of coal mining. It is discharged and stacked all around the mine and the dust pollution has become a public hazard. This paper commits an investigation on the asphalt mixture which takes advantage of coal gangue as coarse aggregate. The physical-mechanical performances of coal gangue aggregate are presented and the result indicates that coal gangue aggregate can meet ...

  • Factors Affecting Brittleness Behavior of Coal-Gangue ...

     · Coal gangue, which is the solid waste produced during the coal processing, causes serious environmental problems. Lightweight concrete by making use of the coal-gangue ceramsite as the aggregate has many advantages as the construction material. However, the high brittleness of lightweight aggregate concrete is one of the problems for its application in building infrastructure.

  • Properties of steel fiber reinforced coal gangue coarse ...

     · In this paper, workability, strength and durability of coal gangue coarse aggregate concrete with different steel fiber content levels have been studied. The results indicate that the concrete compressive strength, flexural strength and tensile splitting strength at the age of 28 days increase with the steel fiber content increasing, while cost and impermeability reduce with steel fiber ...

  • Aggregate stability and organic carbon distribution in ...

    Experimental site were selected from reclamation soil filled with coal gangue of two typical coal mining subsidence areas in Huainan, China. To discuss mechanical stability aggregate, water stable aggregates size distribution and soil organic carbon content in different coversoil thickness.

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

    The study found that after adding 0.3% PET fiber, the coal gangue fine aggregate concrete with a replacement rate of 50% has better mechanical properties and less brittleness. 1. Introduction. Coal gangue is a kind of solid waste with low carbon content and hard texture produced in the process of coal …

  • Freezing-ThawingDamageMechanismofCoalGangueConcrete ...

     · use of the waste coal gangue to produce concrete. Coal gangue mainly comes from the "three northern regions," namely,northChina,northeastChina,andnorthwestChina [5], which are located in the severe cold area. In order to make effective use of local material of gangue, the appli-cation area of gangue concrete is also concentrated in the

  • Compression of Aggregates of Acid-Leached Coal Gangues ...

    Coal gangue samples in an identical stress state displayed strain values that were proportional to the particle size. The strain in the coal gangue samples was inversely proportional to the pH; the intensity of the gangue reactions with H + ions increased as the pH decreased, which aggravated the degradation of the physical properties of the ...

  • Influence of coarse coal gangue aggregates on elastic ...

     · Coarse coal gangue aggregates (CGAs) exhibit lower physical properties than those of reference coarse natural aggregate (NA), and accordingly, the strength of concrete using coarse CGAs is commonly lower than that of reference NA concrete [12,13].For example, RCGA presented decreases in density of 1.9–4.4% and was 3.8–4.0 times higher in water absorption compared to those of reference …

  • CN107686309B

    The invention discloses a modified coal gangue aggregate concrete, and belongs to the technical field of building materials. The coal gangue aggregate reacts with hydrochloric acid, and the coal gangue aggregate is filtered, washed and dried to obtain primary treated coal gangue and acid leaching filtrate; ultrasonically dispersing the pretreated coal gangue, nano iron powder and a saturated ...

  • Effects of the variety and content of coal gangue coarse ...

     · Because the formation mechanism of coal gangue varies in each region of China, there are large differences in the physical, chemical and mineral compositions of the gangue. Additionally, there are different technical requirements for coal gangue aggregates in coal gangue aggregate concrete used in different engineering applications.

  • Effects of surface-activated coal gangue aggregates on ...

     · Effects of calcined coal gangue (CG) aggregates treated by the surface thermal activation on the flowability and strength, and paste-CG aggregate interfaces of the cement-based material were investigated. The experimental results show that the compressive and flexural strength of the cement-based material with the calcined CG aggregates is much higher than that of the material …

  • Experimental study on the influence of temperature on ...

     · On this basis, the coal gangue was used as coarse aggregate instead of some natural stones, and the influence of different temperatures on the compressive properties of coal gangue aggregate concrete was studied. The results show that the compressive strength of gangue concrete is lower than that of ordinary concrete at room temperature.

  • Coal gangue processing

    Coal gangue introduction: Coal gangue is a rock mixed with organic and inorganic compounds co-deposited with coal during coal formation ually in a thin layer and in the coal seam or in the top of the coal seam, the bottom of the coal seam om the perspective of coal mining, domestic coal mines produce 104.5 billion tons of coal, 38.5 billion tons of coal, and 1.9 billion tons of waste rock ...

  • Migration characteristics and toxicity evaluation of heavy ...

     · A lightweight aggregate (LWA) was manufactured from municipal sewage sludge, gangue, and coal ash. The product performance and environmental safety of the sintered material were evaluated by changing the sludge blending ratio and sintering temperature. The distribution and migratory transformation characteristics of heavy metals in LWA were examined by BCR sequential extraction in …

  • Utilization of Coal Gangue Aggregate for Railway Roadbed ...

     · 3. Coal gangue roadbed protecting concrete (CGRPC) with coal gangue aggregate can e ectively protect the roadbed from attack. 4. The technical and economic benefits for coal gangue applied in railway roadbed construction are analyzed. 1. Introduction Coal gangue is normally seen as an industrial solid waste, and it is widely distributed in coal

  • Utilization of Coal Gangue Aggregate for Railway Roadbed ...

    Coal gangue aggregate was employed as high-grade railway subgrade filler andprepared concrete for roadbed drainage (named coal gangue roadbed protecting concrete—CGRPC). First, the basic properties of coal gangue such as particle size distribution, ignition loss, strength change under water softening, and compression performance were measured.

  • Experimental study on the durability of the concrete with ...

     · To investigate the feasibility and durability of aggregate concrete with coal ganguean experimental study was conducted to validate two relevant indexesi.e.drying shrinkage performance and freezing resistance performance.The performances of the concrete made of coal gangue aggregate and common broken stone aggregate were carefully compared and analyzed.The drying shrinkage …

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

    coal gangue aggregate concrete is about 39% higher than that ofnatural coal gangue concrete[15]. Whenthe gangue aggre-gate Fuller gradation curve index (n) is 0.62, the porosity of concreteisthelowest andthedensity isthehighest.Thecom-pressive strength of 28d coal gangue aggregate concrete can reach 37MPa, which meets the strength requirements ...

  • Preparation System Design of Filling Material with Coal ...

    Based on green mining idea, this paper developed a kind of filling material with coal gangue as coarse aggregate and designed underground-preparation system with the main processes being breaking, mixing and pumping. As a result of the research, the coal gangue pollution and surface subsidence problem was effectively solved and the load of lift transportation system reduced and the cost of ...

  • Acoustic Emission and Ultrasonic Characteristics in the ...

    power plant of Xinyang Colliery. ­e coal gangue and waste concrete act as the aggregate in the CWCGB. Coal gangue is extracted from the gangue mountain of the Xinyang coal mine in Shanxi province, which is categorized into ne (0–5mm) and coarse (5–15mm) gangue according to the particle size range. ­e mineral composition and chemical

  • 《》!

     · Properties of Spontaneous Combustion Coal Gangue Coarse Aggregate and Its Influence on Concrete: :2018-10-25 :2018-12-25: DOI: 103969/j.issn1007 9629202002015: :

  • Shrinkage and Strength Properties of Coal Gangue Ceramsite ...

     · Coal gangue can be converted into low-density ceramsite aggregates, which can be used to make low-density coal lightweight aggregate concrete, usually with an apparent density <1950 kg/m³ .There are three types of coal gangue ceramsites (CGC): self-igniting coal gangue, burning coal gangue, and coal gangue mixed with binder . Utilizing coal ...

  • 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 ...

  • EffectofCapillaryWaterAbsorptiononElectricalResistivityof ...

    utilization of the coal gangue. As an important aspect of the utilization, coal gangue ceramsite demonstrates the char-acteristics of light weight and high strength. e coal gangue ceramsite are used as coarse aggregates in concrete for re-ducing the mining of the traditional aggregates [30]. Compared with traditional aggregates, the coal gangue

  • RQWKHLQIOXHQFHRIWHPSHUDWXUHRQFRPSUHVVLYH …

    coal gangue were obtained. On this basis, the coal gangue is used as coarse aggregate instead of some natural stones, and further study the influence of different temperatures on the compressive properties of coal gangue concrete, providing a basis for the resource utilization of pingxiang coal gangue. 2. Test Section 2.1.The raw material

  • Is the Coal Gangue Really Useless

    As far as the current utilization situation of coal gangue, the more mature approach is to make bricks, hollow block, cement raw materials, and lightweight aggregate. 5. Coal gangue is used to generate electricity. Coal gangue contains carbon, hydrogen, oxygen, and other calorific components.

  • Frost Resistance of Coal Gangue Aggregate Concrete ...

    Coal gangue, a by-product produced during the process of coal mining and washing, has a serious impact on the environment. Using coal gangue as a concrete aggregate has been proven helpful in potentially improving its value and reducing its environmental impact to a certain extent. However, the high water absorption and low strength of coal gangue aggregate cause a poor frost resistance of ...

  • Activity of calcined coal gangue fine aggregate and its ...

     · 2.2. Coal gangue fine aggregate activity analysis. Gangue mineral composition analysis was conducted using X-ray diffractometer. The coal gangue in 500, 600, 700, 800, and 900 °C temperature was calcined under 2 h and rapidly cooled to room temperature.The diffraction experiment was conducted according to the diffraction condition 325 to grind the coal gangue into powder.

  • Energies | Free Full-Text | Effects of Kaolin Addition on ...

    During this, fragments with relatively few aggregates (coal gangue) were retained, and large particles such as aggregates (coal gangue) were removed. After mixing the samples with pure potassium bromide at a ratio of 1:10, grinding, and pressing, they were placed in the spectrometer and scanned 50 times to obtain the infrared spectrum.

  • Effect of Polypropylene Fiber on the Strength and Dry ...

     · Fine coal gangue aggregate (CGA) has a high water absorption, which increases the cracking risk of mortar caused by dry shrinkage. The effects of polypropylene (PP) fiber on the fluidity, strength, dry shrinkage, and cracking of CGA mortar were studied in this paper. The results show that PP fiber reduces the fluidity of CGA mortar, but PP fiber improves compressive and flexural strengths ...

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

     · 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 absorption, cylinder …

  • Study on Preparation of Coal Gangue-Based Geopolymer ...

     · Alkaline dry powder activator, coal gangue, fly ash, and other raw materials are utilized to prepare coal gangue-based geopolymer concrete. The procedures of making the coal gangue-based geopolymer concrete are illustrated firstly. Also, basic mechanical properties, such as compressive strength and flexural strength of the geopolymer concrete, are studied through mechanical tests.

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

    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.

  • KR20130009000A

    The present invention is an artificial lightweight aggregate using coal waste-rock and its manufacturing method, the raw material is 75-85% (weight ratio) of coal waste-rock powder, 5-10% adhesive, 1-5% additives and 5-10 fly ash Composition as an expanding solidifying agent; In addition, the method of manufacturing artificial lightweight aggregate includes the following procedure; Raw ...

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

     · The coal gangue was crushed and sieved according to GB/T 14685-2011 for the preparation of ordinary concrete. The particle size of the sieved coal gangue coarse aggregates was in the range of 5 mm–35 mm. The basic physical properties of natural gravel and coal gangue were tested as listed in Table 1

  • Factors Affecting Brittleness Behavior of Coal-Gangue ...

    Coal gangue is the solid waste produced during the coal processing, and causes serious environmental problems. Lightweight concrete by making use of the coal-gangue ceramsite as the aggregate has many advantages as the construction material. However, the high brittleness of lightweight aggregate concrete is one of the problems in its application in building infrastructure.