| 摘要: |
| 为进一步促进外掺MgO混凝土的研究与应用，分析了是否使用湿筛方法筛除粒径大于40 mm粗骨料对龄期长达1 400 d的标准尺寸和非标准尺寸的外掺MgO混凝土自生体积变形的影响。结果表明，在相同MgO掺量下，不管龄期长短，湿筛后混凝土试件的自生体积变形均大于未湿筛的混凝土，且湿筛后非标准尺寸混凝土试件的自生体积变形增量小于标准尺寸试件（标准尺寸试件增大15×10-6左右，非标准尺寸试件增大12×10-6左右）；不管试件尺寸标准与否，湿筛与未湿筛混凝土试件的自生体积变形差值相对稳定，随龄期的波动不大，尤其是3年以上龄期的波动更小。 |
| 关键词: MgO混凝土 自生体积变形 试件尺寸 湿筛 长龄期 |
| DOI： |
| 分类号:TV431 |
| 基金项目:国家自然科学基金资助项目（51269003,50969002）；贵州省“125”重大科技专项（黔教合重大专项字［2012］004号） |
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| Analysis of autogenic volume deformation of MgO concrete at long age |
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CHEN Chang-li1, ZHAO Zhen-hua1, LI Wei-wei1, LI Liang-chuan2
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1.School of Materials and Architecture Engineering， Guizhou Normal University， Guiyang;2.School of Civil Engineering， Guizhou University， Guiyang
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| Abstract: |
| In order to improve studies and application of concrete with light-burned magnesium oxide（MgO concrete）, the effect of aggregates with particle size larger than 40 mm on the autogenic volume deformation of both standard and non-standard size specimen of MgO concrete of the age as long as 1 400 days is analysed in this paper. The analysis results show that the autogenic volume deformation of the concrete specimen which has been wet-screened is larger than the specimen without wet-screening no matter how long the age is, and the increment of the autogenic volume deformation of the wet-screened non-standard specimen is smaller than that of the standard specimen（the increment of the standard specimen is about 15×10-6 while that of the non-standard specimen is about 12×10-6）; and the differences of the autogenic volume deformation of the specimen whether wet-screened or not are relatively stable and the fluctuating value with age is small, and is especially tiny when the age is beyond 3 years no matter the specimens size is of the standard or not. |
| Key words: concrete with light-burned magnesium oxide （MgO concrete） autogenic volume deformatin of concrete concrete specimen size wet screening long age |
