| 摘要: |
| 为研究碳化行为对碱性胶凝材料干燥收缩的影响，以水玻璃或NaOH为碱组分，制备275×50mm碱矿渣水泥石试件，并测量275×1mm水泥石薄片在干缩条件与碳化条件下的直径变化率，以表征碱矿渣水泥石的干燥收缩与碳化收缩.结果表明：在(20±1)℃，相对湿度(70±5)%的条件下，以NaOH为碱组分的碱矿渣水泥石干燥收缩大于以水玻璃为碱组分的碱矿渣水泥石干燥收缩；碳化使硅酸盐水泥石的收缩增加，但未增加碱矿渣水泥石的收缩；碱当量适当提高有利于减小碱矿渣水泥石的干燥收缩与碳化收缩；以模数为12~15的水玻璃配制的碱矿渣水泥石干燥收缩与碳化收缩较小. |
| 关键词: 碱矿渣水泥石 碳化 干燥收缩 |
| DOI：103969/j.issn1007 9629201502007 |
| 分类号: |
| 基金项目:陕西省教育厅自然科学专项项目（2013JK0923）；陕西省自然科学基金资助项目（2013JQ6015）；同济大学道路与交通工程教育部重点实验室开放基金资助项目（K201402） |
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| Influence of Carbonation on Drying Shrinkage of Alkali Activated Slag Cement Stone |
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HE Juan1, HE Tingshu1, YANG Changhui2, WANG Zhenjun3
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1.College of Material and Mineral Resources, Xian University of Architecture & Technology, Xian 710055, China;2.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;3.School of Materials Science and Engineering, Changan University, Xian 710061, China
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| Abstract: |
| In order to study the effects of carbonation behavior of alkali activated cementitious material on drying shrinkage, alkali activated slag cement stone (AASS) specimen of 27. 5× 50mm was prepared by using water glass (WG) and sodium hydroxide (NH) as the alkali activator, and diameter change rate of 27. 5× 1mm cement sheets under drying and carbonation condition was measured to characterize the drying shrinkage and carbonation shrinkage of cement stone. The results show that in the temperature of (20±1)℃ and relative humidity of (70±5)%, drying shrinkage of AASS activated with NH is greater than that of AASS activated with WG. Carbonation increases the shrinkage of Portland cement stone, but does not increase the shrinkage of AASS. The appropriate raise of Na2O is helpful to reduce drying shrinkage and carbonization shrinkage of AASS. When water glass with the modulus of 1215 is used as the activator, drying shrinkage and carbonation shrinkage is relatively small. |
| Key words: alkali activated slag cement stone carbonation drying shrinkage |
