Improving the properties of metakaolin/fly ash composite geopolymers with ultrafine fly ash ground by steam-jet mill

Zhang, Quanchao; Huang, Dajian; Zhang, Xiaopeng; Liu, Lin; Wang, Zhiwu; Tang, Wenjie; Xia, Qiang

doi:10.1016/j.conbuildmat.2023.131673

Cited by 6 publications

(2 citation statements)

References 49 publications

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“…In contrast to MA-FA, the reduction in particle size results in a reorganized structure and phase transition. The decreased particle size augments the surface area, thereby expediting the hydration reaction rate and promoting the formation of a more compact gel [39][40][41]. In accordance with Bowers' strength theory, the density of a structure exhibits a direct proportionality to its strength.…”

Section: Introductionmentioning

confidence: 73%

Effect of Precursor Blending Ratio and Rotation Speed of Mechanically Activated Fly Ash on Properties of Geopolymer Foam Concrete

Liu,

Jiang,

et al. 2024

Buildings

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This research used fly ash and slag to create geopolymer foam concrete. They were activated with an alkali, resulting in a chemical reaction that produced a gel that strengthened the concrete’s structural integrity. The experimental approach involved varying the fly ash content in the precursors at incremental percentages (10%, 30%, 50%, 70% and 90%) and subjecting the fly ash to mechanical activation through a planetary ball mill at distinct rotational speeds (380, 400, 420 and 440 rpm). The investigation discerned that the fly ash content and particle structure exert a discernible influence on macroscopic properties, including flowability, air generation height, compressive strength, dry density and microstructural characteristics such as pore distribution and hydration product arrangement in the geopolymer foam concrete. Employing analytical techniques such as X-ray diffraction (XRD) and scanning electron microscopy (SEM), it was deduced that diminishing the fly ash content correlates with an enhancement in compressive strength. Furthermore, the specific strength of the geopolymer foam concrete reached a peak of 0.041 when the activated fly ash in the planetary ball mill rotated at 420 rpm, manifesting a lightweight and high-strength outcome.

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Section: Introductionmentioning

confidence: 73%

Effect of Precursor Blending Ratio and Rotation Speed of Mechanically Activated Fly Ash on Properties of Geopolymer Foam Concrete

Liu,

Jiang,

et al. 2024

Buildings

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“…Researchers have also pointed out in some studies that superheated steam has excellent particle crushing performance, which can avoid the problem of excessive impurities and large particles caused by metal grinding mill [5]. Zhang et al used a steam-jet mill to optimize the fineness and properties of flyash as a replacement for metakaolin (MK) in the production of geopolymers, and results showed that the small particle size and irregular shape of the flyash had high activity and excellent filling effect [6]. Alexander et al proposed an innovative method to assess the stressing conditions in jet mills experimentally, and the proposed approach was validated using particle image velocimetry during secondary gas injection into a fluidized bed reactor [7].…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of flyash fluidized-bed pulverization with superheated steam

Zhang,

Hong,

Liu

et al. 2024

J. Phys.: Conf. Ser.

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The supersonic pulverization technology uses superheated steam generated by the boiler to generate supersonic airflow through the Laval nozzle, and accelerates the flyash fed into the crushing chamber by the screw feeder, and then the flyash can be crushed in mutual collision and friction process. The present paper conducted CFD simulation of fluidized-bed pulverization with superheated steam, and both the velocity filed and the particle tracks are obtained. Convergence test was performed firstly to verify the numerical results, and three different meshes and several different numbers of particles are employed here to show the average velocity of the particles through a certain horizontal plane. The effect of some key parameters, such as distance between the two opposite nozzles and feeding locations of the flyash to the velocity filed and the particle velocity are also numerically investigated. Results show that, the best distance between the two opposite nozzles of the four-nozzle case is 142 mm and the average particle velocity distribution varies little with the flyash feeding position for the present jet mill model.

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Comparative study on the performance of ultra-fine fly ash prepared by different techniques in Portland cement and alkali-activated material

Liu

Zhu

et al. 2023

Construction and Building Materials

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Improving the properties of metakaolin/fly ash composite geopolymers with ultrafine fly ash ground by steam-jet mill

Cited by 6 publications

References 49 publications

Effect of Precursor Blending Ratio and Rotation Speed of Mechanically Activated Fly Ash on Properties of Geopolymer Foam Concrete

Effect of Precursor Blending Ratio and Rotation Speed of Mechanically Activated Fly Ash on Properties of Geopolymer Foam Concrete

CFD simulation of flyash fluidized-bed pulverization with superheated steam

Comparative study on the performance of ultra-fine fly ash prepared by different techniques in Portland cement and alkali-activated material

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