General method of specimen preparation for the quantitative microscopic characterization of nano- and microparticles

Urfels, Stephan; Bauer, Johann; Vogel, Herbert

doi:10.1016/j.matchar.2019.04.043

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…The region percentages (porosities) of the samples are listed in Table 3. (p) (q) (r) Many studies [39][40][41][42] have shown that porosity has a significant relationship with UCS. Table 3 shows the porosity of CGFB samples with different amounts of kaolin instead of cement.…”

Section: Microstructure Characteristicsmentioning

confidence: 99%

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Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Yin

Zhu

et al. 2021

Energies

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In this investigation, six groups of cemented coal gangue-fly ash backfill (CGFB) samples with varying amounts of kaolin (0, 10, 20, 30, 40, and 50%) instead of cement are prepared, and their mechanical properties are analyzed using uniaxial compression, acoustic emission, scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The uniaxial compressive strength, peak strain, and elastic modulus of CGFB samples decreased with the kaolin content. The average uniaxial compressive strength, elastic modulus, and peak strain of CGFB samples with 10% amount of kaolin are close to that of CGFB samples with no kaolin. The contribution of kaolin hydration to the strength of CGFB sample is lower than that of cement hydration, and the hydration products such as ettringite and calcium-silicate-hydrate gel decrease, thereby reducing strength, which mainly plays a role in filling pores. The contents of kaolin affect the failure characteristics of CGFB samples, which show tensile failure accompanied by local shear failure, and the failure degree increases with the kaolin content. The porosity of the fracture surface shows a decreasing trend as a whole. When the amount of kaolin instead of cement is 10%, the mechanical properties of CGFB samples are slightly different from those of CGFB samples without kaolin, and CGFB can meet the demand of filling strength. The research results provide a theoretical basis for the application of kaolin admixture in fill mining.

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Section: Microstructure Characteristicsmentioning

confidence: 99%

“…In summary, the porosity of CGFB samples decreases with the increase of kaolin instead of cement, and the UCS gradually decreases. Many studies [39][40][41][42] have shown that porosity has a significant relationship with UCS. Table 3 shows the porosity of CGFB samples with different amounts of kaolin instead of cement.…”

Section: Microstructure Characteristicsmentioning

confidence: 99%

Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Yin

Zhu

et al. 2021

Energies

View full text Add to dashboard Cite

show abstract

Compressive strength and cracking of composite concrete in hot-humid environments based on microscopic quantitative analysis

Zhu

2019

Construction and Building Materials

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General method of specimen preparation for the quantitative microscopic characterization of nano- and microparticles

Cited by 2 publications

References 10 publications

Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Effects of Kaolin Addition on Mechanical Properties for Cemented Coal Gangue-Fly Ash Backfill under Uniaxial Loading

Compressive strength and cracking of composite concrete in hot-humid environments based on microscopic quantitative analysis

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