| 摘要: |
| 采用光学显微镜、扫描电镜（SEM）、背散射电子图像（BSE）和X射线能谱分析（EDAX）观察和分析了Mg2+在熟料和水泥水化产物中的赋存状态.结果表明：在生长空间充裕的情况下熟料中的方镁石可形成八面体晶体,受生长空间限制可形成半自形晶或他形晶;熟料中方镁石晶粒尺寸主要分布在100～650μm,其中250～300μm晶体最多,最大粒径可达4000μm;水泥水化后期,Mg(OH)2晶体沿c轴方向生长速度加快,颗粒厚度明显增加;固溶于熟料铝相中的MgO原位水化后形成Mg6Al2CO3(OH)16·4H2O;从熟料中引入的Mg2+可以与Ca2+、Si4+等离子形成水化硅酸钙镁或者吸附于水化硅酸钙表面. |
| 关键词: 方镁石 显微分析 镁离子 赋存状态 |
| DOI：103969/j.issn.1007 9629202005004 |
| 分类号: |
| 基金项目:国家重点研发计划项目(2016YFB0303400，2017YFB0309903 03)；陕西省重点研发计划项目(2020GY260);陕西省教育厅重点科学研究计划项目(20JS079，20JY040) |
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| Microanalysis on Occurrence State of Mg2+ in Clinker and Cement Hydrates |
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SONG Qiang1, DENG Yang2, HU Yaru1, WANG Qian1, CHEN Yanxin1
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1.College of Materials Science and Engineering, Xian University of Architecture and Technology, Xian 710055, China;2.Shaanxi Fuping Ecocement Co., Ltd., Weinan 711709, China
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| Abstract: |
| Occurrence state of Mg2+ in clinker and hydrates was observed and analyzed with optical microscope, scanning electron microscopy(SEM), backscattered electron image(BSE) and energy dispersion X ray analysis(EDAX). The results show that when the growth space is sufficient, the periclase forms octahedron structure, and subhedral or anhedral crystal is formed in limited space in clinker. Grain size of periclase in clinker is mainly in the range of 100650μm, most of the grains size ranges from 250 to 300μm, and the length of the largest particle is up to 4000μm. At the later stage of cement hydration, the growth rate of Mg(OH)2 crystal along the c axis direction is accelerated and the particle thickness is increased notably. MgO dissolved in the clinker aluminum solid phase forms Mg6Al2CO3(OH)16·4H2O after in situ hydration and carbonization. Mg2+ introduced from clinker can form magnesium calcium silicate hydrate with Ca2+, Si4+, etc., or be absorbed on the surface of calcium silicate hydrate. |
| Key words: periclase microanalysis magnesium ion occurrence state |
