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
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
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.
席雅允, 沈玉, 刘娟红, 吴瑞东, 许鹏玉. 化学激发对煤气化渣-水泥体系抗压强度影响机理研究[J]. 材料导报, 2021, 35(z2): 262-267.
XI Yayun, SHEN Yu, LIU Juanhong, WU Ruidong, XU Pengyu. Influence Mechanism of Chemical Excitation on Compressive Strength of Slag Cement System in Coal Gasification. Materials Reports, 2021, 35(z2): 262-267.
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2021, Vol. 35 
