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 …

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.

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 …

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 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 …

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 …

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 …

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 ...

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 …

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, …

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 …

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 …

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.

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 …

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.

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), …

The structural application of coal gangue coarse aggregate concrete, such as in beams, columns, and walls, is rather little and is not deep enough, which also includes design methods for structural members with coal gangue concrete. ... Natural coal gangue (namely rock coal gangue) is a rock-like mining waste that normally appears from gray …

@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}, …

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 …

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 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 ...

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 …

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 …

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, …

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….

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.

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 ...

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 …

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.

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 …