期刊
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
卷 37, 期 10, 页码 1487-1495出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2010.09.001
关键词
Cement paste; Dielectric; Heat transfer; Microstructure; Microwave energy
资金
- Thailand Research Fund (TRF)
In this study, microwave curing at an operating frequency of 2.45 GHz of Portland cement paste at an early-stage using a multi-mode cavity is presented. First, the dielectric evolution of the cement paste at a water-to-cement mass ratio of 0.38 during a 24-h first-hydration period was measured. Secondly, the microstructural characteristics of the hardened cement paste after heating for 45 min in microwaves at a power of 390 W, with specific attention to the temperature rise were investigated experimentally and theoretically. The obtained results show that dielectric properties decrease rapidly during the hydration reaction and formation resuming and then proceeding with a high rate. During microwave heating, the temperature increased monotonically. The micrographs of the microwave-heat paste clearly indicate that the samples consisted of hydrated phases and pores, as well as cores of Ca(OH)(2) dendrite crystals, calcium silicate hydrate (C-S-H), and granular structure. The results of the temperature rise in our experiment without loss of moisture and steady heat transfer conduction, consistently agreed with the mathematical model developed for this study. (C) 2010 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据