| 摘要: |
| 采用X射线衍射（XRD）和固体魔角核磁共振硅谱（29Si MAS NMR）技术，研究了不同养护温度下MgO/SiO2体系水化产物的结构特征.结果表明：死烧MgO比轻烧MgO衍射峰强度更大；水化硅酸镁(M S H)凝胶呈结晶性较差、短程有序的层状硅酸盐结构；M S H含量随着养护温度的升高而增多，相同养护温度下M S H的含量随着龄期的延长而增多,50℃下养护28d的试样M S H含量最多；养护温度过高会抑制M S H的生成；高温养护有利于Q1向Q2、Q2向Q3转化，使得M S H硅氧四面体聚合度提高. |
| 关键词: MgO/SiO2体系 水化硅酸镁 养护温度 聚合度 |
| DOI：103969/j.issn1007 9629201806003 |
| 分类号: |
| 基金项目:“十三五”国家重点研发计划项目(2017YFB0309903 03)；陕西省重点研发计划项目(2017GY 142,2017GY 176)；陕西省自然科学基金资助项目(2017JM5097) |
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| Effect of Curing Temperature on Microstructure of Hydration Products of MgO/SiO2 System |
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XIAO Jianmin, HU Yaru, SONG Qiang
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College of Materials and Mineral Resources, Xian University of Architecture and Technology, Xian 710055, China
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| Abstract: |
| The structural feature of hydration products of MgO/SiO2 system under different curing temperatures was investigated by X ray diffraction(XRD) and 29Si magic angle spinning nuclear magnetic resonance(29Si MAS NMR) respectively. The results reveal that the diffraction peak intensity of dead burning MgO is higher than that of soft burning MgO. M S H gel is layered silicate which is poorly crystalline of short range ordered structures. The content of M S H increases with the rising of curing temperature；under the same curing temperature the content of M S H increases with prolongation of hydration time. When the age is 28d and curing temperature is 50℃, the content of M S H is at the most. But the formation of M S H is suppressed when the curing temperature is too high. High curing temperature is favorable for the conversion of Q1 to Q2 and Q2 to Q3 and is beneficial for polymerization degree of silica. |
| Key words: MgO/SiO2 system hydrated magnesium silicate（M S H） curing temperature polymerization degree |
