Fractal characteristics of particle groups and mechanochemical effects of Yellow River sediment after mechanical grinding

IF 4.7 3区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Sustainable Cement-Based Materials Pub Date : 2023-06-04 DOI:10.1080/21650373.2023.2218841

M. Cao, Honglei Zhang

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引用次数: 0

Abstract

This paper investigated the fractal characteristics of particle groups and the mechanochemical effects of mechanically grinding Yellow River Sediment (MGYRS). The particle groups of MGYRS had good fractal characteristics, and the fractal dimension had a better correlation with the particle size, distribution and specific surface area of MGYRS, which could well reflect the changes in the physical properties of MGYRS. After mechanical milling, the analysis by XRD, FT-IR and XPS microscopic tests revealed that: the crystallinity and grain size of mineral crystals in MGYRS decreased with the increase in milling time. The electron binding energy of Si2p, Al2p and O1s shifted to the low-energy direction, and the chemical valence state of silicon atoms appeared Si3+ due to the breakage of the Si-O-Si/Al chemical bond. These changes in internal structure and chemical valence state were the microscopic manifestations of mechanochemical effects. The activation rate of MGYRS increased with the increase of grinding time, which was the macroscopic manifestation of mechanochemical effects.

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黄河泥沙机械碾磨后颗粒群的分形特征及力学化学效应

研究了黄河泥沙机械碾磨过程中颗粒群的分形特征及力学化学效应。MGYRS颗粒群具有良好的分形特征，分形维数与MGYRS颗粒大小、分布和比表面积有较好的相关性，能很好地反映MGYRS物理性质的变化。机械磨矿后，通过XRD、FT-IR和XPS细观测试分析发现:随着磨矿时间的延长，MGYRS中矿物晶体的结晶度和晶粒尺寸减小。由于Si-O-Si/Al化学键断裂，Si2p、Al2p和O1s的电子结合能向低能方向转移，硅原子的化学价态出现Si3+。这些内部结构和化学价态的变化是机械化学作用的微观表现。MGYRS的活化率随磨矿时间的增加而增加，这是力学化学效应的宏观表现。

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来源期刊

Journal of Sustainable Cement-Based Materials Multiple-

CiteScore

6.60

自引率

15.90%

发文量

期刊介绍： The Journal of Sustainable Cement-Based Materials aims to publish theoretical and applied researches on materials, products and structures that incorporate cement. The journal is a forum for discussion of research on manufacture, hydration and performance of cement-based materials; novel experimental techniques; the latest analytical and modelling methods; the examination and the diagnosis of real cement and concrete structures; and the potential for improved cement-based materials. The journal welcomes original research papers, major reviews, rapid communications and selected conference papers. The Journal of Sustainable Cement-Based Materials covers a wide range of topics within its subject category, including but are not limited to: • raw materials and manufacture of cement • mixing, rheology and hydration • admixtures • structural characteristics and performance of cement-based materials • characterisation techniques and modeling • use of fibre in cement based-materials • degradation and repair of cement-based materials • novel testing techniques and applications • waste management