机械粉磨对黄河泥沙颗粒群特性及胶凝活性的影响

doi:10.11896/cldb.22090257

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Abstract In this work, Yellow River sediment was activated by mechanical grinding. The changes in particle groups characteristics and cementitious activity of the sediment with increasing grinding time were investigated. The changes in particle size distribution, mineral composition and crystal structure were characterized to explain the mechanism of mechanical activation, and the intrinsic relationship between variations in particle size distribution and activity index was expressed quantitatively using gray correlation analysis. The activity index increased and then decreased with the increase of mechanical grinding time, and the highest activity index at 40 min was 53.9%, 67.6% and 84.7% for 3 d, 7 d and 28 d, respectively. Within 40 min, the reduction of particle size was higher, and the decrease of particles was smaller after more than 40 min. In the particle size distribution of the sediment, particles smaller than 20 μm played an enhancing role on the activity index;particles larger than 20 μm played a deteriorating role on the activity index;the variation of particle content in the particle size range of 10—20 μm exhibited the greatest influence on the activity index. After mechanical milling, the half-height width of the diffraction peaks increased, the grain size decreased, and the crystallinity of the mineral crystals decreased significantly. These changes in crystal structure parameters were intrinsic factors for the increase of activity index.

Key words： mechanical grinding particle groups characteristics activity index crystallinity gray correlation analysis

Published: 10 July 2024 Online: 2024-08-01

CLC number:

TU525

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	ZHANG Honglei
	CAO Mingli

Cite this article:

ZHANG Honglei,CAO Mingli. Influence of Mechanical Grinding on the Particle Groups Characteristics and Cementitious Activity of Yellow River Sediment[J]. Materials Reports, 2024, 38(13): 22090257-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22090257 OR http://www.mater-rep.com/EN/Y2024/V38/I13/22090257

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