Materials Reports  2021, Vol. 35 Issue (z2): 262-267 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Influence Mechanism of Chemical Excitation on Compressive Strength of Slag Cement System in Coal Gasification |
| XI Yayun1, SHEN Yu2, LIU Juanhong1,3,4, WU Ruidong1, XU Pengyu1
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1 College of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 The Third Engineering Co., Ltd., CCCC Second Highway Engineering Co., Ltd., Xi'an 710016, China
3 Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China
4 Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines, USTB, Beijing 100083,China |
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Abstract Aiming at the problems of environmental pollution and waste of solid resources caused by large amount of coal gasification slag, this paper uses chemical excitation method to stimulate the activity of coal gasification slag, and explores the influence of different activators on the compressive strength of coal gasification slag-cement system. Sulfate, alkali and polymeric salt activators were selected to determine the optimal type and dosage of activators. The effects of different activators on the hydration products of coal gasification slag-cement system were studied by means of scanning electron microscopy (SEM), X-ray diffraction (XRD) and TG. The results show that the optimal sulfate activator is sodium sulfate, and the optimal dosage is 2.5%. The compressive strength of the sample increases by 14.3% and 3.4% after 3 and 28 days, respectively. The optimal alkali activator was calcium hydroxide, and the optimal dosage was 0.5%. The compressive strength of the samples increased by 18.4% and 1.8% after 3 and 28 days, respectively. When the optimal content of polymeric aluminum is 2.0%, the compressive strength increases by 24.0% and 3.3% after 3 and 28 days, respectively. The early compressive strength of the samples was improved after the addition of the stimulating agent. The microscopic characteristics showed that the hydration degree of the samples was deepened, which was helpful to the formation of hydration products such as ettringite and gel, and improved the strength of the samples. This provided a theoretical basis for the application of coal gasification slag in cement-based materials.
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Published: 09 December 2021
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51834001), the Fundamental Research Expenses for the Central Universities (FRF-BD-20-01A,FRF-BD-20-01B). |
About author:: Yayun Xi, a postgraduate student in the School of Civil and Resource Engineering, University of Science and Technology Beijing, her current main research field is green high performance concrete.
Juanhong Liu is a professor and doctoral supervisor at the School of Civil and Resource Engineering, University of Science and Technology Beijing. She has long been engaged in the teaching and research of modern concrete technology. She presided over more than 60 projects including the National Natural Science Key Fund, Gene-ral Fund, National Key Basic Research and Development Plan, Provincial and Ministerial Science and Technology Plan Projects, and horizontal scientific research projects. She won 2 first prizes, 1 second prize, and 4 third prizes for provincial and ministerial scientific and technological progress. She obtained more than 20 national in-
vention patents. More than 160 articles have been published in public journals, and more than 60 articles have been included by SCI and EI. She published academic monographs Green High Performance Concrete Technology and Engineering Application, Reactive Powder Concrete, Solid Waste and Low Carbon Concrete, etc. She edited the textbook Civil Engineering Materials. Her main scientific research results have been applied to the concrete crack control of the Beijing Olympic Project subway project; the road and bridge projects in Guangdong Province and Zhejiang Province; the key projects in Xinjiang, Ningxia and other autonomous regions; and Datang International Power Generation Co., Ltd. fly ash quality improvement. |
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