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.
通讯作者: *曹明莉,大连理工大学土木工程学院教授、博士研究生导师。本科及硕士毕业于武汉工业大学(现武汉理工大学)材料科学专业,博士毕业于大连理工大学材料学专业(建筑材料方向)。2017—2018年澳大利亚 CSIRO Manufacturing 访问学者。目前主要从事水泥基材料微纳米改性及多尺度纤维增强理论与技术、黄河泥沙资源化利用等方面的研究工作。近年来以一作/通信作者在ACI、ASCE、Composites Part B、Composites Part A、Cement and Concrete Composites、Construction and Building Materials、《材料导报》《硅酸盐学报》等期刊发表SCI/EI论文60余篇,授权国家发明专利14项,获得省部级以上奖励10余项;承担国家、省部级科研项目10余项,主持国际合作技术开发及成果转化项目2项。minglic@dlut.edu.cn
张洪磊, 曹明莉. 机械粉磨对黄河泥沙颗粒群特性及胶凝活性的影响[J]. 材料导报, 2024, 38(13): 22090257-6.
ZHANG Honglei, CAO Mingli. Influence of Mechanical Grinding on the Particle Groups Characteristics and Cementitious Activity of Yellow River Sediment. Materials Reports, 2024, 38(13): 22090257-6.
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2024, Vol. 38 
