| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Influences of Raw Materials Mass Ratio on Properties and Microstructure of Salt Lake Magnesium Potassium Phosphate Cement |
| DONG Jinmei1,2, XIAO Xueying1,2, LI Ying1,2, WEN Jing1,2, ZHENG Weixin1,2,3, CHANG Chenggong1,2, YU Hongfa4,5
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1 Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences,Xining 810008, China
2 Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China
3 University of Chinese Academy of Science, Beijing 100049, China
4 Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
5 Civil Engineering Institute, Qinghai University, Xining 810016, China |
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Abstract Asalt lake magnesium potassium phosphate cement (MKPC) was prepared directly by using the by-products of extracting lithium boron magnesium oxide (B-MgO) as raw material and reaction with potassium dihydrogen phosphate after appropriate treatment without admixture. The influence law of hydration hardening process of MKPC was studied by testing the setting time, hydration heat temperature, compressive strength, porosity and analyzing the phase composition and microstructure of different MgO/KH2PO4 (M/K)mass ratio. The results indicate that M/K mass ratio has significant influence on hydration heat curve, compressive strength and porosity of MKPC. There exists an optimum M/K mass ratio of 1∶1 to 2∶1, which can make the compressive strength of MKPC higher at all curing times, the maximum strength of 3 h up to 87.2 MPa and keep the maximum hydration exothermic temperature and porosity in the optimum range. In hardened MKPC with the optimum M/K mass ratio, more hydrates are formed and grow perfectly and stably with few defects and cracks insulting in perfect microstructure.
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Published: 26 April 2020
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| Fund:This work was financially supported by Special Project for the Basic Research on Application in Qinghai Province (2020-ZJ-746) and Youth Innovation Promotion Association of Chinese Academy of Sciences (2018467, 2019423). |
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Corresponding Authors:
Hongfa Yu, professor, doctoral supervisor, Depar-tment of Civil Engineering, Nanjing University of Aeronautics and Astronautics. His main research direction is high performance concrete material, structure durability and life prediction. He has published 2 monographs, more than 100 papers, of which more than 30 EI papers.
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| About author:: Jinmei Dong, received her Ph.D. degree in inorganic chemistry from Institute of Qinghai Salt Lake Research (CAS) in 2015. She is currently an associate professor in Institute of Qinghai Salt Lake Research (CAS), focusing on comprehensive utilization of magnesium resources in salt lakes and basic research of magnesium cementitious materials. |
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2020, Vol. 34 
