Microstructure of Fly Ash Activated by Microwave and Early Performance of Fly Ash-Cement Paste
LUO Shuqiong1, GE Yali1, PAN Chonggen2, YUAN Sheng3, YANG Lei1,*
1 Henan Outstanding Foreign Scientists’ Workroom, Henan Key Laboratory of Materials on Deep-Earth Engineering, School of Materials Science and Enginee-ring, Henan Polytechnic University, Jiaozuo 454003, Henan, China 2 School of Engineering & Architecheture, Ningbo Tech University, Ningbo 315100, Zhejiang, China 3 Ningbo Construction Guangtian Component Co., Ltd., Ningbo 315100, Zhejiang, China
Abstract: Microwave irradiation is a low carbon and effective method of activation to stimulate the activity of fly ash, and high-activity fly ash is beneficial to the preparation of early-strength concrete. In this study, effects of microwave irradiation temperature (600 ℃, 700 ℃, 800 ℃) on the physico-chemical properties of fly ash were studied. The phase composition and microstructure were characterized by XRD and SEM. At the same time, the early properties of fly ash-cement paste system were investigated. Results showed that microwave irradiation promoted the transformation of quartz and mullite phases in fly ash to amorphous phase, which greatly improved the activity of fly ash. When the microwave irradiation temperature was 800 ℃, compared with crude fly ash, the amorphous phase content increased from 49.13% to 58.71%. The 28 d activity index reached 94.13%, increased by 33.06%. Compared with the crude fly ash-cement paste, the early mechanical properties of the fly ash-cement paste irradiated by microwave at 800 ℃ were significantly improved, and the compressive strength at 1 d increased by 41.36%. Therefore, the suitable temperature for microwave irradiation activating fly ash was 800 ℃.
罗树琼, 葛亚丽, 潘崇根, 袁盛, 杨雷. 微波活化粉煤灰的微观结构及粉煤灰-水泥浆体的早期性能[J]. 材料导报, 2024, 38(7): 22090256-6.
LUO Shuqiong, GE Yali, PAN Chonggen, YUAN Sheng, YANG Lei. Microstructure of Fly Ash Activated by Microwave and Early Performance of Fly Ash-Cement Paste. Materials Reports, 2024, 38(7): 22090256-6.
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2024, Vol. 38 
