Theoretical model for spontaneous combustion gangue coarse aggregate …
The cementitious material used in this paper was ordinary Portland cement with a strength grade of 42.5R, and the coarse aggregates used were gravel (Fig. 2 a) and SCG (Fig. 2 b).The SCG was obtained from a coal mine in Fuxin, Liaoning Province, China, and was crushed, screened, and graded according to the technical requirements …
Effect of content and particle size distribution of coal gangue coarse …
This paper presents results of the content and particle size distribution of coal gangue coarse aggregate (A/B ratio, size 5-10 mm weight/10-15 mm weight) on concrete performance.
The Potential Use of Waste Rock from Coal Mining …
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 …
Shrinkage model for concrete incorporating coal gangue coarse …
Coal gangue, a coal mining and processing byproduct, has long been considered a valueless waste material [1]. ... Extensive experimental and theoretical investigations have been conducted on coal gangue aggregate concrete (CGAC) material properties, including compressive strength [5,8,9], elastic modulus [10,11], stress-strain …
Aggregates for Concrete
CHAPTER 1—INTRODUCTION. Hydraulic cement concrete is a cement and water paste in which aggregate particles are embedded. Aggregate is granular material such as sand, gravel, crushed stone, blast-furnace slag, and lightweight aggregates that usually occupies approxi-mately 60 to 75% of the volume of concrete.
(PDF) ASSESSMENT OF COAL MINE OVERBURDEN SAND FOR USE IN CONCRETE
The obtained sand is named as coal mine overburden sand (CMOB sand). The recovery of CMOB sand was around 82%. The photographs of the overburden, CMOB sand and clay (CMOB clay) recovered from the overburden are presented in fig.-1. Aggregate in concrete is an inert filler material. It occupies most of the volume of the concrete.
Application of Coal Gangue as a Coarse Aggregate in …
Among the techniques for converting stacked coal gangue to reusable material, one of the most effective ways is to use coal gangue as a coarse aggregate in …
Preparation of coal gangue ceramsite high-strength …
Therefore, a more direct and effective method of using CG is to use it as a coarse or fine aggregate in concrete after crushing 14, 15, 16. However, CG …
Sulfuric acid resistance of concrete containing coal
In this study, natural coarse aggregate with a specific gravity (2.6 g/cm 3), water absorption (1.1%), and a maximum nominal size (12.5 mm) was applied.Also, washed river sand with a water absorption of 0.8%, a specific gravity of 2.6 gr/cm 3, and a fineness modulus of 2.78 was applied as natural fine aggregate.Following the ASTM C88 model, …
Valorization of calcined coal gangue as coarse aggregate in concrete
Engineering, Materials Science. ACS omega. 2024. The wide application of concrete prepared with coal gangue (CG) as an aggregate (CPCGA) is limited because of the low mechanical strength and strong water absorption capacity of …
Study on the mechanical behavior and micro-mechanism of concrete …
DOI: 10.1016/j.conbuildmat.2022.127626 Corpus ID: 248596871; Study on the mechanical behavior and micro-mechanism of concrete with coal gangue fine and coarse aggregate @article{Yu2022StudyOT, title={Study on the mechanical behavior and micro-mechanism of concrete with coal gangue fine and coarse aggregate}, author={Linli Yu …
How Coarse Aggregate Affects Mix Design of …
Coarse aggregate is one of the essential components of concrete and occupies the largest volume in the mix. That is why it greatly affects the concrete mix design. Its properties …
Multi-Scale Analysis of the Damage Evolution of Coal Gangue Coarse …
This study utilized X-ray computed tomography (CT) technology to analyze the meso-structure of concrete at different replacement rates, using a coal gangue coarse aggregate, after experiencing various freeze–thaw cycles (F-Ts). A predictive model for the degradation of the elastic modulus of Coal Gangue coarse aggregate Concrete (CGC), …
Utilization of raw coal gangue as coarse aggregates in pavement concrete
Effect of raw coal gangue coarse aggregates on mechanical properties and compressive stress–strain response of concrete. Raw coal gangue (RCG) as one of the solid wastes can result in serious ecological and environmental pollution. Utilization of RCG as coarse aggregates in concrete can mitigate the demand for natural….
Fine Aggregate for Concrete: 3 Classification, Properties …
Answer: Fine aggregate is used in concrete to serve two purposes, 1. Provides a filler for the spaces between the coarse aggregates (like gravel or crushed stone) in a concrete mix. 2. This helps to reduce the void content in the concrete mixture, enhancing the overall compactness and workability of the material.
Utilization of coal gangue as coarse aggregates in structural concrete …
Xiaojun Li. Engineering, Environmental Science. Materials. 2022. Coal gangue (CG) represents a huge amount of industrial solid waste in China, and usually is used as a coarse aggregate to produce low-strength coal-gangue-based concrete. In this paper, in order to….
Utilization of coal gangue as coarse aggregates in structural concrete …
The coal gangue was used as coarse aggregate to prepare coal gangue aggregate concrete (hereinafter referred to as GAC) as the support system under the mine or applied in the infrastructure ...
Multi-Scale Analysis of the Damage Evolution of Coal Gangue Coarse …
Therefore, coal gangue coarse aggregates can be deemed a feasible alternative to natural aggregates. However, it is important to note that the porous and water-absorbing characteristics of coal gangue can also result in the poor workability of concrete containing coal gangue aggregate [6,34]. Pre-wetting the aggregate can …
Utilization of coal gangue as coarse aggregates in structural concrete …
In most of the studies on coal gangue concrete from the aspect of material, 50% coarse aggregate replacement ratio was commonly used as the maximum replacement ratio whilst coarse aggregate replacement ratio was also investigated by some researchers [8].Since the aim of this study is to maximize the application …
Preparation of coal gangue ceramsite high-strength concrete …
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 for every 10 tons of produced coal 4,5. ...
Enhancing the use of coal-fly ash in coarse …
The experimental work has been made to estimate the operation of coal-fly ash as acceptable and coarse aggregates concrete with the ordinary Portland cement of 53 grade. Initially, the chemical ...
Compressive Strength and Durability of Coal Gangue Aggregate Concrete
The existence of the cavities at the bond between the coal gangue and the cementing material inhibits compressive strength and durability of the concrete, but is beneficial to the concrete's resistance against chloride ion per-meation. The substitution of calcined coarse coal gangue can result in a more dense concrete structure compared to ...
The influence of coal gangue coarse aggregate on the …
When mixing coal gangue concrete, first mix the coal gangue coarse aggregate with additional water, then add sand and cement to mix evenly, and finally add all the mixing water. By adjusting the amount of water reducer, the slump of each group of concrete is roughly between 10 cm and 11 cm.
Utilization of coal gangue as coarse aggregates in structural concrete
The coal gangue used as coarse aggregates in the following test was collected from a coal mine in Binxian, Shaanxi province, China, as shown in Fig. 1. The coal gangue was crushed and sieved according to GB/T 14685-2011 [32] for the preparation of ordinary concrete. The particle size of the sieved coal gangue coarse aggregates …
Valorization of calcined coal gangue as coarse aggregate in concrete
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 environmental issue of accumulation but also reducing the mining of natural aggregate. However, compared to natural aggregate, the strength …
Investigation on Anti-carbonation Performance of Coal Gangue Coarse
With low water cement ratio (such as 0.35), anti-carbonization performance of calcined coal gangue coarse aggregate concrete is more significant than non-calcined coal gangue coarse aggregate ...
Compressive Strength and Durability of Coal Gangue …
The present work can provide experimental basis and theoretical reference for the highly efficient utilization of coal gangue. Key words： coal gangue compressive strength rapid …
Mechanical and environmental performance of structural concrete …
Since concrete-filled steel tube (CFST) can fully utilize the self-properties of steel tube and concrete, scholars have attempted to apply coal gangue as coarse aggregate in the core concrete of CFST. Li et al. presented the predicted formula for the flexural strength of the coal gangue coarse aggregate concrete-filled steel tube [39, 40].
Environmentally friendly utilization of coal gangue as aggregates …
@article{Chen2021EnvironmentallyFU, title={Environmentally friendly utilization of coal gangue as aggregates for shotcrete used in the construction of coal mine tunnel}, author={Pei-yuan Chen and Liheng Zhang and Yonghui Wang and g and Feng Zhang and Ying Xu}, journal={Case Studies in Construction Materials}, …
Valorization of calcined coal gangue as coarse aggregate in concrete
Additionally, by replacing all aggregates with CGFAs and coal gangue coarse aggregates, the 28 d compressive strengths of samples W0.5R100 and W0.4R100 were 44.8 and 52.24 MPa, respectively, which ...