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

doi:10.11896/cldb.22090256

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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 ℃.

Key words： microwave irradiation fly ash activation microstructure hydration

Published: 10 April 2024 Online: 2024-04-11

CLC number:

TU528.041

Fund:Ningbo Science and Technology Innovation 2025 Key Project (2020Z040), the National Natural Science Foundation of China (52278256, 51808196), the Doctor Fund from Henan Polytechnic University (B2021-15), the Post-doctor Fund from Henan Polytechnic University (672108/106), and the Fundamental Research Funds for the Henan Polytechnic University (2022) (NSFRF220418).

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	Articles by authors
	LUO Shuqiong
	GE Yali
	PAN Chonggen
	YUAN Sheng
	YANG Lei

Cite this article:

LUO Shuqiong,GE Yali,PAN Chonggen, et al. Microstructure of Fly Ash Activated by Microwave and Early Performance of Fly Ash-Cement Paste[J]. Materials Reports, 2024, 38(7): 22090256-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22090256 OR http://www.mater-rep.com/EN/Y2024/V38/I7/22090256

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