Durability of Concrete With Coal Gasification Slag and Coal Gangue Powder

Zhu, Xingbao; Guo, Zhaoheng; Yang, Wen Fen; Song, Wenjing

doi:10.3389/fmats.2021.791178

Cited by 14 publications

(5 citation statements)

References 21 publications

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“…[5,[34][35][36][37] Researchers investigated various volcanic ash materials and added them to concrete; These materials could improve the mechanical properties of recycled aggregate concrete. Zhu et al [38] introduced coal gasification slag (CGS) as a gel material in concrete. After subjecting the concrete to 125 cycles of freeze-thaw testing, CGS concrete exhibited strong frost resistance.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Coal Gangue Powder on the Macroscopic Mechanical Properties and Microstructure of Recycled Aggregate Concrete

Zhenli,

Shu,

et al. 2023

Global Challenges

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The construction and coal industries generate substantial industrial waste, including coal gangue and construction and demolition (C&D) waste, leading to environmental pollution and high disposal costs. Integrating recycled aggregates (RAs) and coal gangue powder (CGP) into concrete is an effective approach for waste management. However, CGP can affect the performance of traditional recycled concrete. This study primarily aims to optimize the utilization of RAs and CGP while maintaining concrete performance. They utilized orthogonal experimental designs and microscopic characterization techniques, including scanning electron microscopy (SEM), energy‐dispersive X‐ray spectroscopy (EDS), and X‐ray diffraction (XRD). Orthogonal experimental analysis indicated that with a water‐cement ratio (WCR) of 0.5 and replacement rates of 10% for CGP and 60% for RA, compressive and splitting tensile strengths reached 73.6% and 77.4% of ordinary C30 concrete, respectively. This mix proportion minimizes strength decline in coal gangue powder‐recycled aggregate concrete (CGP‐RAC) while maximizing recycled material replacement. Microscopic analysis revealed that CGP increased the Ca/Si ratio in cement paste, impeding hydration reactions, resulting in a looser internal structure and reduced concrete strength. These findings are anticipated to provide fresh theoretical insights for solid waste recycling and utilization.

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Section: Introductionmentioning

confidence: 99%

“…Zhu et al. [ 38 ] introduced coal gasification slag (CGS) as a gel material in concrete. After subjecting the concrete to 125 cycles of freeze‐thaw testing, CGS concrete exhibited strong frost resistance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Coal Gangue Powder on the Macroscopic Mechanical Properties and Microstructure of Recycled Aggregate Concrete

Zhenli,

Shu,

et al. 2023

Global Challenges

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“…In addition to theoretical models, experimental studies have also investigated the mechanisms of chloride ion transport in different dimensions. Some researchers have studied the chloride ion transmission law in different dimensions and the distribution of chloride ion in concrete through the electrochemical test and analysis of concrete specimens, 26,27 while others have used linear sweep voltammetry (LSV) and alternating impedance spectroscopy (EIS) to study the chloride ion transmission law in concrete under one‐dimensional diffusion conditions 28 . Some researchers also measured the concentration distribution of chloride ions in concrete by x‐ray fluorescence spectrometry (XRF) to study the transmission law of chloride ions in different dimensions 29‐35 …”

Section: Introductionmentioning

confidence: 99%

Research on improving the durability performance of damaged concrete with mineral admixtures

Jing,

Liu,

Guo

et al. 2023

Engineering Reports

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Concrete can be damaged under long‐term chloride ion action. This article uses mineral admixtures to repair the damaged concrete, and then conducts durability performance tests. Multi‐dimensional chloride ion diffusion tests were conducted under different salt solution immersion environments. The resistance of concrete to chloride ion corrosion was evaluated through RCM chloride ion penetration test, and the internal chloride ion concentration of concrete with different diffusion dimensions was detected through chemical titration analysis. Taking the SW test group as an example, after soaking for 3 months, the three‐dimensional diffusion chloride ion concentration of the SW test group is 2.55 times that of the one‐dimensional diffusion. Under the same three‐dimensional diffusion conditions, at a depth of 10 mm of concrete erosion, the chloride ion concentration of the SW test group after soaking for 3 months is 1.76 times that of the chloride ion concentration after soaking for 1 month. Experiments have shown that multi‐dimensional diffusion can significantly increase the concentration of chloride ions inside concrete, and this effect becomes more pronounced with the increase of erosion time and dimension.

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“…Under the combined effect of load, deformation, and environmental factors, concrete may experience tensile stress that exceeds its tensile strength, resulting in cracking [1]. Concrete cracking is a challenging issue to prevent, as cracks provide pathways for the ingress of water, carbon dioxide, oxygen, chlorides, and sulfates from the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method of Self-Healing Concrete to Improve Durability and Extend the Service Life of Civil Infrastructure

Xue,

Gao,

Zhao

2023

Advances in Civil Engineering

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Concrete civil infrastructure often suffers severe damage to its internal structure due to insufficient durability in high and cold complex environments, affecting the service life of the infrastructure. Therefore, a novel method based on nanofillers for self-healing concrete is proposed to optimize the durability mix proportion of high-performance concrete in complex high and cold environments, which improves the strength recovery rate of concrete. Moreover, a concrete durability prediction model based on particle swarm optimization-least squares support vector machine (PSO-LSSVM) and improved NSGA-II (nondominated sorting genetic algorithm II) algorithm was proposed to quickly and accurately determine the optimization scheme of self-healing concrete mix proportion. First, the model employs PSO-LSSVM to achieve highly accurate predictions of relative dynamic elastic modulus and chloride ion permeability coefficient, which are key indicators of the concrete durability. Subsequently, the predicted regression functions for concrete durability are utilized as fitness functions, and the improved NSGA-II algorithm is employed to obtain the optimal mix ratio for durable concrete. Finally, the Pareto frontier solution set is processed using the ideal point method selection approach to determine the optimal concrete mix ratio scheme. To assess the self-healing ability of the proposed concrete, a concrete durability test study is conducted. Experimental research shows that the durability of the proposed self-healing concrete has been significantly improved. The optimized PSO-LSSVM model demonstrates excellent generalization capability. The coefficient of determination between the predicted and actual values in the test dataset is 0.9357, and the root-mean-square error is 0.10267. Building upon this, the enhanced concrete durability prediction model based on the NSGA-II algorithm proves to be highly effective in predicting the optimal concrete mix proportion scheme. The predicted values of chloride ion permeability coefficient and relative dynamic elastic modulus of the proposed model differ from the actual experimental values by 1.29% and 0.59%, significantly better than the other prediction models.

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Durability of Concrete With Coal Gasification Slag and Coal Gangue Powder

Cited by 14 publications

References 21 publications

Influence of Coal Gangue Powder on the Macroscopic Mechanical Properties and Microstructure of Recycled Aggregate Concrete

Influence of Coal Gangue Powder on the Macroscopic Mechanical Properties and Microstructure of Recycled Aggregate Concrete

Research on improving the durability performance of damaged concrete with mineral admixtures

A Novel Method of Self-Healing Concrete to Improve Durability and Extend the Service Life of Civil Infrastructure

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