Effect of Activated Coal Gangue in North China on the Compressive Strength and Hydration Process of Cement
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 4
Abstract
For comprehensive utilization of the coal gangue from different locations, coal gangues were calcined at temperatures of 800°C, 900°C, and 1,000°C for 2 h, respectively, and then blended in cement with a replacement level of 10%, 20%, 30%, and 40% by weight to fabricate the blended cement mortars. By means of Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscope (SEM), and an ion solubility test, the thermal-activation mechanism and pozzolanic activity evaluation for coal gangue was investigated, and the effect of coal gangue on mechanical properties and the hydration process of cement mixture was also studied. Results show that the optimum thermal-activation temperature of coal gangue is 800°C: the coal gangues in Yangquan, Huozhou, and Xinzhi, China, had higher activity and the replacement level of coal gangue in the cement can reach 40% by weight, but the coal gangues in Yanzhou, Zhengzhou, and Qitaihe, China, showed lower activity. The replacement level of coal gangue in the cement should not exceed 20% by weight. The active and in the thermal-activated coal gangue are able to react with the , which was produced by cement hydration, and form hydrated calcium silicate and hydrated calcium aluminate gel to enhance the compressive strength of cement.
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Acknowledgments
This work was supported by the Key Research and Development Plan of Jiangxi Province (20171BBG70078), the National Natural Science Fund of China (51662008 and 51708220), the Natural Science Fund of Jiangxi Provincial Science and Technology Department (20171BAB206009), and the Scientific Research Fund of Jiangxi Provincial Education Department (GJJ160611).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 4 • April 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Oct 5, 2017
Accepted: Sep 13, 2018
Published online: Jan 30, 2019
Published in print: Apr 1, 2019
Discussion open until: Jun 30, 2019
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