| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Mechanisms of Drying Shrinkage for Alkali-Activated Slag/Metakaolin Composite Materials |
| LI Shuang1,2, LIU Hexin1, YANG Yong1, LI Qing1, ZHANG Zhilu1, ZHU Xiaohong1, YANG Changhui1, YANG Kai1
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1 College of Materials Science and Engineering, Chongqing University, Chongqing 40045,China
2 Chengdu Institute of Product Quality Inspection Co. Ltd, Chengdu 610000,China |
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Abstract This study examined influences of metakaolin, alkali concentration and curing regimes on the drying shrinkage of alkali-activated slag- metakaolin materials (AASM). The results indicated that comparing to the reference sample (no metakaolin), the mass loss of composite materials increased and the internal relative humidity decreased, when the metakaolin was added to replace the 50% slag. Meanwhile, the content of free water and reaction products with crystal structure increased in these materials, which is helpful to reduce the sensitivity of drying shrinkage to mass loss. In addition, appropriately increased of curing temperature could improve the crystal structure of reaction products, which is helpful to reduce the drying shrinkage of the materials. It was noted that AASM was eased be carbonized. Besides, too high alkali concentration (such as 10%) and too long high temperature curing time would have negative effect to drying shrinkage.
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Published: 23 February 2021
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51878102), the National Key Research and Development Plan of the Thirteenth (2017YFB0309905), and the Natural Science Foundation of Chongqing (cstc2018jcyjAX0403). |
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Corresponding Authors:
yang.kai@cqu.edu.cn
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About author:: Shuang Li received her M.S. degree in June 2019 from Chongqing University. She is mainly focusing on the research of alkali activated binder.
Kai Yang received his Ph.D. degree in the Queen's University of Belfast in 2012. He is currently an asso-ciate professor in Chongqing University, focusing on transport characteristics of concrete and chemical activated cement. |
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2021, Vol. 35 
