LUO S Q, ZHAO M H, GE Y L, et al.Microwave hydrothermal synthesis of fly ash based tobermorite[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):183-189.

doi:10.16186/j.cnki.1673-9787.2021120053

Received:2021/12/17

Revised:2022/02/21

Published:2023/09/25

Microwave hydrothermal synthesis of fly ash based tobermorite

LUO Shuqiong1, ZHAO Minghui1, GE Yali1, CHANG Jindan3, YANG Lei1, XIE Yufen1, MAO Yuxiang2

1.School of Materials Science and Engineering，Henan Polytechnic University，Henan Key Laboratory of Materials on Deep-Earth Engineering，Henan Outstanding Foreign Scientists Studio of Green High-performance Building Materials，Jiaozuo  454000，Henan，China;2.School of Resources ＆ Environment，Henan Polytechnic University，Jiaozuo  454000，Henan，China;3.Shanxi Changping Coal Industry Co.，Ltd.，Jincheng  048000，Shanxi，China

Abstract:In order to solve the issues including long time and high energy consumption of traditional hydrothermal synthesis of fly ash based tobermorite，microwave hydrothermal synthesis of fly ash based tobermorite was proposed. Fly ash and calcium hydroxide were used as raw materials，microwave and traditional hydrothermal synthesis experiments were carried out under the conditions of Ca/（Al+Si） molar ratio at 0.83，liquid-solid ratio of 30 ml/g and synthesis temperature of 220 ℃. Following this，XRD，SEM，FTIR and N₂ adsorption tests were conducted. Results showed that the main products obtained by either microwave or traditional hydrothermal synthesis were aluminum substituted tobermorite in long flakes. Compared with the products synthesized by traditional hydrothermal condition，the products synthesised by microwave hydrothermal condition had smaller average pore size and larger specific surface area. In addition，the synthesis time was only half of the traditional hydrothermal synthesis time. Therefore，fly ash based tobermorite obtained under microwave hydrothermal condition had more advantages. This could provide some technical guidance and theoretical reference for preparing aerated concrete with tobermorite as the main hydration product using microwave autoclaved technology.

Key words:microwave;hydrothermal synthesis;fly ash;tobermorite

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