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Densification of Fresh Concrete by Microwave

Grattan, K. T. V., Jia, Y., Gutfreund, E., Savvides, S., Shi, S., Bai, Y., Fabian, M., Sun, T. and McCague, C. (2015). Densification of Fresh Concrete by Microwave. Paper presented at the 35th Cement and Concrete Science Conference, 26-28 Aug 2015, Aberdeen, Scotland.

Abstract

Concrete mixes with different fly ash replacement levels, namely 0%, 35% and 55% at a fixed water to binder ratio (W/B) of 0.6 were heated by a tailor-made microwave oven up to 50oC immediately after casting until initial setting in order to remove excessive free water. The compressive strengths of microwave densified samples after 7 days were 3.2%, 7.7% and 29.6% higher than those of oven heated batches. It demonstrated that higher density, lower water absorption and better microstructure were achieved after microwave heating, indicating microwave heating can be a promising technique for densifying fresh concrete.

Publication Type: Conference or Workshop Item (Paper)
Publisher Keywords: Densification, Fly ash, Fresh Concrete, Microwave
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
School of Mathematics, Computer Science & Engineering > Engineering > Electrical & Electronic Engineering
URI: http://openaccess.city.ac.uk/id/eprint/17168
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