Impacts of microwave on hydration evolution of Portland cement in the perspective of composition and microstructure of hydrates

被引：18
|
作者：
Gao, Zhiyang [1 ,2 ]
He, Yan [3 ]
Li, Meng [3 ]
Jiang, Mingjing [3 ]
Shen, Junan [4 ]
机构：
[1] Changjiang River Scient Res Inst Changjiang Water, Wuhan 430010, Peoples R China
[2] Natl Dam Safety Res Ctr, Wuhan 430010, Peoples R China
[3] Suzhou Univ Sci & Technol, Sch Civil Engn, Suzhou 215011, Peoples R China
[4] Jiangsu Technol Industrializat & Res Ctr Ecol Rd E, Suzhou 215011, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 360卷
基金：
中国国家自然科学基金;
关键词：
Portland cement; Microwave curing; Steam curing; Hydration; Microstructure; FREEZE-THAW DURABILITY; COMPRESSIVE STRENGTH; TRICALCIUM SILICATE; CRYSTAL-STRUCTURE; CONCRETE; PASTE; ENERGY; DIFFRACTION; PHASE; WATER;
D O I：
10.1016/j.conbuildmat.2022.129569
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Effects of microwave curing on the hydration evolution of Portland cement were analyzed, compared with normal curing and steam curing. Hydration products, microstructure of cement paste, and the underlying mechanism were investigated. Results showed that the hydration degree of Portland cement under microwave curing for 45-min radiation was higher than that under steam curing at 80 degrees C for 4 h and normal curing for 12 h. Steam curing promoted the hydration of C3S, and microwave curing accelerated the hydration of C2S. The main hydration products of C3A under normal, steam, and microwave curing, were AFt, katoite, and AFm, respec-tively. Microwave curing reduced the content of portlandite (CH), decreased the normal size of the face (001) of CH, and increased the preferred orientation of CH. In comparison with steam curing, microwave curing gener-ated granular C-S-H gel with a high Ca/Si atom ratio in hydrated Portland cement.
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页数：10
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