Coal gangue is a byproduct produced in the process of coal mining, consisting of a heterogeneous mixture of rock minerals with a relatively low rate of utilization. The self-ignition of residual coal can result in the emission of sulfur, chlorides, and heavy metals, which contribute to environmental contamination [1], [2].
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when the amount of activated coal gangue in cement mortar was between 10% − 40%, the 3 d compressive strength of the specimen decreased slightly, while the 28 d and 90 d compressive strength ... mix ratio is listed in Table 3. Coal gangue admixture concrete was made according to GB/t 50080-2016 (), and the feeding sequence was pre-mixed …
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Coal gangue is a by-product generated from coal mining and washing. Using coal gangue as aggregate is an effective approach of valorization this high-volume industrial waste, not only solving the ...
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Setting time and fluidity affect the machinability of CGG. ... Tan Y., Wang Y.C., Liu C.X. Mechanical properties and chloride permeability of green concrete mixed with fly ash and coal gangue. Constr. Build. Mater. 2020 ... Ji Y.H., Bai Z.L., Zhao Q.K. Research on mechanical behavior of calcined coal gangue cement mortar with …
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Coal gangue (CG) is an environmental waste that faces an urgent demand for disposal in China. The utilization of CG in construction materials has broad application prospects and gained increasing interest. However, the poor compatibility of polycarboxylate superplasticizer (PCE) with CG powder hinders its efficiency in a wide …
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Activity of calcined coal gangue fine aggregate and its effect on the mechanical behavior of cement mortar. Constr. Build. Mater., 100 (17) (2015), pp. 63-69. View PDF View article ... Mechanical properties and chloride permeability of green concrete mixed with fly ash and coal gangue. Constr. Build. Mater., 233 (2020), Article …
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When NaOH and Na 2 O·nSiO 2 were mixed to stimulate coal gangue-slag mortar, ... The effect of slag content and NH modules on the fluidity of cement pastes and compressive strength of alkali ...
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Although the calcination-based activation of coal gangue is important for its valorization in the form of cementitious materials, the related works mainly focus on high-quality coal gangue, neglecting its …
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DOI: 10.1016/J.JCLEPRO.2021.126004 Corpus ID: 233566732; Incorporation of self-ignited coal gangue in steam cured precast concrete @article{Zhang2021IncorporationOS, title={Incorporation of self-ignited coal gangue in steam cured precast concrete}, author={Junyi Zhang and Tiefeng Chen and Xiaojian Gao}, journal={Journal of Cleaner …
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1. Introduction. Ultra-high performance concrete (UHPC) is a fiber-reinforced cement-based composite material based on the dense particle packing theory, which has ultra-high mechanical properties and excellent durability [1, 2].UHPC has important application potential in such as large-span bridges, super high-rise buildings, and construction …
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Coal gangue (CG) is a type of industrial solid waste produced by the process of coal excavation and separation 1,2,3.Generally, one ton of CG is discarded …
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The coal gangue mortar specimens are mixed with Portland cement at a mass ratio of 3 : 7. The cement to mortar ratio is 1 : 3, and the water-cement ratio is …
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1.2. Source and distribution of CG in China. CG is a kind of black gray shale rock produced in the process of coal production. China is the world's largest coal producer (Munir et al., 2020) and also the largest coal consumer.Coal provides about 62% of China's energy demand (Mita et al., 2015).In the process of sorting and processing, the production of …
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Compressive Strength and Durability of Coal Gangue Aggregate Concrete: MA Hongqiang 1, YI Cheng 1, ZHU Hongguang 1, DONG Zuochao 2, CHEN Hongyu 1, WANG Jiaxin 1, LI Deyi 1: 1 School of Mechanics and Civil Engineering, China University of Mining and Technology Beijing, Beijing 100083; 2 School of Architecture and Civil Engineering, …
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Many researches on coal gangue are aimed at increasing its activity by many methods together such as thermal, mechanical and chemical. The methods are so …
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In order to reveal the influence of coal gangue aggregate activity on the mechanical properties of the mortar, to promote coal gangue fine aggregate in concrete mortar application, this paper in ...
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The mortar internal structure is more uniform, calcined coal gangue fine aggregate and cement mortar are more of a strong continuous whole, which increase the later strength of hardened cement ...
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The activity of calcined fine aggregate of coal gangue from low to high refined the porosity of the mortar, improved effectively the pore structure of cement mortar, reduced its porosity, and ...
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Coal gangue as admixture cement gelled material preparation, the preparation process of coal gangue calcined temperature of 600, using common P • O32.5R ordinary Portland cement, add 15% of fly ash and 1% of poly (carboxylic acid water reducing agent, chemical excitation agent with a purity of 99.9% Ca(OH)2, Na2SO4 and CaCl2, preparation of …
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By using slag as a calcium source, high-strength alkali-activated coal gangue-slag (AACGS) cementitious material can be prepared. Given that higher drying shrinkage at room temperature is detrimental to the expanded engineering application of the material, this paper studies several methods for reducing drying shrinkage such as …
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Put the proportionally weighed cement, CG, and FA into the mixer for 2 min to get the uniform dry material. Then water was slowly added and mixed for 2 min to get …
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1. Introduction. Coal gangue is a type of solid waste produced in the coal mining and washing processes. The global coal mining industry produces approximately …
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In order to improve the utilization rate of coal gangue as aggregate in concrete, based on the orthogonal experimental design method, the L16 (4 5) orthogonal table was used to initially prepare the mix ratio, and the concrete compressive specimens were poured, and their compressive strength was tested after standard curing for 7 …
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The feasibility of preparing coal gangue-based geopolymer mortar (CGBGM) with composite-activated coal gangue was experimentally explored in this paper. The effects of water-to-binder ratio (W/B), alkali content (A), and slag content (S) on the fluidity and performances of the CGBGM were experimentally investigated.
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Many researches on coal gangue are aimed at increasing its activity by many methods together such as thermal, mechanical and chemical. The methods are so complex that they are difficult to be adopted by some companies. In this paper, considering the low-strength requirement of cement mortar, the activity of coal gangue is more evidently …
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Dry-mixed mortar refers to a kind of granular or powdery material that is physically mixed with dried and screened aggregates (such as quartz sand), inorganic cementations materials (such as ...
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Hence, the study on coal gangue concrete has been focused on by many scholars in recent years [9, 10], and the results indicate that the mechanical behaviors of coal gangue concrete, made by ...
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In this experiment, the influence of coal gangue as the admixture on the performance of dry-mixed mortar was studied, and the results were analyzed by XRD …
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The performance of blended cement was evaluated by mortar strength and flow. The XRD and TGA-DSC analyses showed that the main minerals that present in …
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Experimental study on the physico-mechanical properties and microstructure of concrete mixed with coal gangue. Author links open overlay panel Xin Zhang a, Xiaoping Feng a ... the prefabricated and cement mortar are mixed and stirred for 1 min to get the concrete slurry. ... it was found that the fluidity of concrete is …
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