| 摘要: |
| 通过添加不同活性MgO，研究了其对碱-矿渣-偏高岭土基地聚物（ASM地聚物）干缩性能的影响，并利用X射线衍射仪（XRD）、扫描电镜（SEM）和压汞仪（MIP）等微观测试手段揭示了其内在影响机制.结果表明：随着MgO活性的增加，ASM地聚物的干缩率先减小后增大，当MgO活性适中时，ASM地聚物干缩率降低约15.0%；所生成的镁铝水滑石及水化硅酸镁（M-S-H）凝胶能够有效填充ASM地聚物孔隙，减小干燥收缩，增加结构致密程度. |
| 关键词: 碱-矿渣-偏高岭土基地聚物 活性MgO 干燥收缩 孔结构 |
| DOI：10.3969/j.issn.1007-9629.2023.06.002 |
| 分类号:TU391 |
| 基金项目:内蒙古自治区自然科学基金资助项目（2020BS05013）；内蒙古工业大学科学研究项目（ZY201917）；桥梁工程安全控制教育部重点实验室项目（19KB05） |
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| Influence of Activated MgO on Drying Shrinkage of Alkali-Slag-Metakaolin Based Geopolymer |
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CUI Chao1, SUN Xiaohui1, WANG Lan1, PENG Hui2
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1.Key Laboratory of Civil Engineering Structure and Mechanics，Inner Mongolia University of Technology， Hohhot 010051， China;2.National-Local Joint Engineering Laboratory of Technology for Long-Term Performance Enhancement of Bridges in Southern District，Changsha University of Science & Technology，Changsha 410114，China
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| Abstract: |
| The effect of different activated MgO on the drying shrinkage performance of alkali-slag-metakaolin based geopolymer（ASM geopolymer） was investigated. The internal mechanism of influence was revealed by X-ray diffractometer（XRD）， scanning electron microscope（SEM）， mercury porosimetry（MIP） and other microscopic test methods. The results show that with the increase of MgO activity， the drying shrinkage of ASM geopolymer decreases at first and then increases， and MgO with moderate activity can reduce the drying shrinkage of ASM geopolymer by about 15.0%. The generated Mg-Al hydrotalcite and magnesium silicate hydrate（M-S-H） gel effectively fill the pores， result in reducing drying shrinkage and increasing structural compactness. |
| Key words: alkali-slag-metakaolin based geopolymer activated MgO drying shrinkage pore microstructure |
