Study on the Pore and Microstructure Fractal Characteristics of Alkali-Activated Coal Gangue-Slag Mortars

Ma, Hui; Sun, Jianwei; Wu, Chao; Cheng, Yi; Yu, Li

doi:10.3390/ma13112442

Cited by 18 publications

(4 citation statements)

References 44 publications

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“…These heterogeneities are uniformly distributed in the matrix and generated during the elaboration process probably due to the retention of air and water bubbles evaporating during the drying stage. Ma et al [2020] reported that, when slag is fully used as raw material, the increase in alkali content would lead to an increase in the characteristic pore size and a decrease in the total porosity. La concentration d'activateurs alcalins a également une grande influence sur les structures des pores en raison du changement de l'étendue de la géopolymérisation et de la teneur en eau [Chen et al, 2022].…”

Section: Effect Of Sludge Dewatered and Stabilized By Hydrated Lime O...mentioning

confidence: 99%

Synthesis and Characterization of Slag-Sludge-Based Eco-Friendly Materials – Industrial Implications

Lagrani¹,

Aziz²,

Bellil³

et al. 2023

J. Ecol. Eng.

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Currently in Morocco, wastewater treatment plants (WWTPs) generate huge quantities of sludge from wastewater treatment. This sludge is a real concern for the environment. No regulatory text takes into account the future and management of sludge, its use in agriculture is not officially authorized and the solutions currently implemented for its elimination or recovery are done on an ad hoc basis and pose a number of difficulties for operators. The objective of the present study is to investigate the stabilization and solidification of a geopolymer based on sewage sludge and blast furnace slag (slag), as well as the possibility to use this geopolymer as a thermal insulation material. The sludge used comes from the AIN AOUDA-activated sludge type WWTP, the collected sludge is dehydrated and stabilized by slaked lime (Ca(OH) 2 ) in the sludge treatment process. The blast furnace slag (slag) came from the plant in France. Four samples were prepared by substituting the slag with quantities (10 to 40%) of limed sludge, a quantity of sand, and a solution of sodium silicate and sodium hydroxide used as an alkaline activator. The effect of limed sludge on the physicochemical and microstructural properties of the synthesized geopolymers was evaluated using several analytical techniques, such as compressive strength, P-wave velocity, density and porosity tests, and X-ray diffraction. The results showed that the addition of 10 to 40% of limed sludge resulted in a progressive decrease in the compressive strength of the synthesized geopolymer and an increase in the thermal conductivity, which allows the use of the synthesized geopolymer as a material.

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Section: Effect Of Sludge Dewatered and Stabilized By Hydrated Lime O...mentioning

confidence: 99%

Synthesis and Characterization of Slag-Sludge-Based Eco-Friendly Materials – Industrial Implications

Lagrani¹,

Aziz²,

Bellil³

et al. 2023

J. Ecol. Eng.

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“…For the CFD-DEM method: determining the fluid properties and particle material characteristics parameters is a prerequisite to ensure accurate calculations. Here we refer to the relevant literature [8] to obtain the particle and fluid related parameters. As shown in Table 1.…”

Section: Flowing Slurry Materials Parametersmentioning

confidence: 99%

“…Chen X et al [7] found that the bend at the gas and solid two-phase flow pipeline is the most serious part of the erosion damage. Based on the above related research [8], this paper takes the bend pipe and uphill pipe sand slurry pumping project as the background, and studies the dynamics of slurry and fine pipe internal performance by CFD-DEM method, and analyzes the relevant parameters to understand the whole process of granular flow pumping in bend pipe with slope.…”

Section: Introductionmentioning

confidence: 99%

CFD-DEM based wind-deposited sand high concentration slurry pipe transport characteristics and erosion study

2022

J. Phys.: Conf. Ser.

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In order to study the conveying process of wind-accumulated sand slurry pipeline, this study simulates the flow process of wind-accumulated sand slurry at 1m/s inlet flow rate with straight pipe bend and uphill by coupled CFD-DEM method. The fluid flow, particle motion and position distribution, pipe erosion and force during the whole process are analyzed based on the selection of a suitable traction model. The results show that the flow velocity of highly viscous slurry at the wall of the pipe is small which can easily lead to the deposition of sand particles, which is proved by the particle velocity cloud diagram. The extent of erosion and the degree of erosion increase with time, and the peak of erosion occurs at the bend. The force changes along the Y-direction in different parts of the pipe show that the extreme values of force and erosion are located at the bend. This part is the weak point of the whole pipeline slurry flow and erosion project should pay attention to reinforcement or monitoring.

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“…Wang et al [27] established the relationship between the sample distribution characteristics and dissipated energy under impact loading. Ma et al [28] discussed the relationship between fractal dimension and compressive strength and found that the compressive strength of the material increased as the fractal dimension increased.…”

Section: Introductionmentioning

confidence: 99%

Study on the Macro-Micro Mechanical Properties of Grout Consolidated Coal under Different Loading Rates

Pan

Wang

et al. 2022

Materials

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The bore hole is sealed from a sealing hole: the surrounding coal fracture permeability and grout cementation form a new consolidated body and coal material. In this paper, the characteristics of the macroscopic compressive strength, microscopic interface bending, porosity, and fractal dimension of the consolidated body were studied, and the structure strength relationship between loading rates, porosity, fractal dimension, and uniaxial compressive strength (UCS) was established. The results show that the loading rates had a great and consistent effect on the macro- and micro-mechanical properties of the consolidated body. Macroscopically, in the range of 0.1~0.4 mm/min, the UCS and elastic modulus of the solidified body increased with the increase in the loading rate, and there was a critical loading rate (η = 0.4 mm/min). At the microscale, with the increase in loading rates, the interface bending phenomenon, porosity, fractal dimension, and UCS of the grout and coal were consistent, showing a trend of increasing first and then decreasing. The fractal dimension was linearly correlated with the UCS and porosity. The loading rates, porosity, fractal dimension, and UCS had a multivariate nonlinear regression distribution.

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Study on the Pore and Microstructure Fractal Characteristics of Alkali-Activated Coal Gangue-Slag Mortars

Cited by 18 publications

References 44 publications

Synthesis and Characterization of Slag-Sludge-Based Eco-Friendly Materials – Industrial Implications

Synthesis and Characterization of Slag-Sludge-Based Eco-Friendly Materials – Industrial Implications

CFD-DEM based wind-deposited sand high concentration slurry pipe transport characteristics and erosion study

Study on the Macro-Micro Mechanical Properties of Grout Consolidated Coal under Different Loading Rates

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