Journal
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Volume 37, Issue 10, Pages 1487-1495Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2010.09.001
Keywords
Cement paste; Dielectric; Heat transfer; Microstructure; Microwave energy
Categories
Funding
- Thailand Research Fund (TRF)
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available