coarse aggregate from coal mine for 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….

Considering the similarity between RCG and natural aggregates, the mechanical and durability behaviors of pavement concrete using raw coal gangue aggregate (RCGA) as coarse aggregates are investigated in this work. A total of 396 samples were produced with three RCGA ratios of 0%, 30% and 50% and two water-to …

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 …

To ensure adequate compaction and reduce voids in the concrete, it's advisable to use coarse aggregates with various fraction sizes. A combination of 20 mm and 10 mm aggregates in ratios like 70:30 or 60:40 can lead to higher concrete density. 6. Efficient Use of Aggregate Sizes. Efficiency is key in construction. Stacking different …

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 …

Reading time: 5 minutes. The aggregates used in the production of concrete are inert granular materials such as gravel, crushed stone, sand, slag, recycled concrete, and geosynthetic aggregates. The aggregates may be natural, manufactured, or recycled. Fig 1: Aggregates used in production of concrete. The aggregates are broadly classified …

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 ...

The raw material of spontaneous-combustion coal gangue was secured from Fuxin, China and processed to the SCGCA with 4.75–19.5 mm continuous gradation (Fig. 1) through operations of crushing, screening, classification and mixing.The natural gravel with the same gradation as SCGCA and river sand with 0.01–4.75 mm particle size scale and …

Light Aggregate Concrete," the water–cement ratio of coal gangue mixed aggregate concrete is a xed value of 0.43, and coarse aggregate of coal gangue replaces coarse aggregate of pumice with equal volume, with substitu-tion rates of 0%, 20%, 40%, 60%, 80%, and . e group with substitution rate of 0% is marked as MFC-0.

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 ...

Abstract. The use of coal gangue as coarse aggregate alleviates the dependence of concrete on natural aggregates and improves the utilization rate of coal gangue resources. The direct use of coal gangue coarse aggregate in the preparation of concrete limits the scope of its use due to the deterioration of its performance.

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, …

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, …

The coal gangue coarse-aggregate content in ordinary concrete should not be too large. In order to further improve the utilization rate of coal gangue coarse aggregate, this study used the principle of "strong wrapped weak" to prepare high-performance concrete. This study considered four factors, namely, water–binder (W/B) …

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 …

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.

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 …

Coal bottom ash can not only be used as a fine aggregate but also as a partial cement replacement in the production of concrete. 3) Concrete incorporating coal bottom ash would be lighter in weight depending upon its proportion used. 4) Water absorption of coal bottom ash is higher than the sand.

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].

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 ...

For coarse aggregates, the apparent density of the crushed coal gangue was 2275.7 kg/m 3, whereas that of natural gravel was 2860.6 kg/m 3.As shown in Fig. 3, the microstructure of the coal gangue was loose and porous compared to the homogenous morphology of natural gravel.In addition, the particle size distributions of fine …

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.

DOI: 10.1016/j.cscm.2022.e01315 Corpus ID: 250538667; The influence of coal gangue coarse aggregate on the mechanical properties of concrete columns @article{Liu2022TheIO, title={The influence of coal gangue coarse aggregate on the mechanical properties of concrete columns}, author={Hanqing Liu and Guo-liang Bai …

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 …

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 …

Coarse aggregates (Fig. 5-2) consist of one or a com-CHAPTER 5 Aggregates for Concrete bination of gravels or crushed stone with particles predominantly larger …

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 …

Crushed limestone aggregate (NA) was selected as fine and coarse aggregates, and recycled concrete aggregate (RA) as seen in Fig. 1 was produced from a 20-MPa concrete pavement slab (parent concrete) at …

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 …

The natural Coarse Aggregate (CA) was replaced by Coarse Coal Gangue Aggregate (CCGA) at 0 %, 25 %, 50 %, 75 % and 100 % by weight of coarse aggregate and cement was replaced by Nano-Silica (NS ...

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 ...

Coal gangue is waste rock generated from coal mining, which results in vast land occupation in mines and severe environmental pollution. ... Sun and Li [17] applied concrete with coal gangue coarse aggregates (CGCAs) as a filling material for goaf retention, which benefits the environment and cost. Zhang, et al. [18] used coal gangue …

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….

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 …

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.

Coarse aggregate is a term used in construction to describe a type of material that is commonly used in the production of concrete. It is typically made up of various materials such as gravel, crushed stone, and recycled concrete. The size of the coarse aggregate can vary, but it is typically between 3/8 inch and 1.5 inches in diameter.

Research has found that coal gangue aggregate (CGA) significantly impacts the mechanical properties of concrete. For example, using coal gangue coarse aggregate (CGCA) can reduce compressive strength by 25% and elastic modulus by 32%.

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 …