Densification of Fresh Concrete by Microwave

Grattan, K. T. V., Jia, Y., Gutfreund, E., Savvides, S., Shi, S., Bai, Y., Fabian, M., Sun, T. & 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.

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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.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Densification, Fly ash, Fresh Concrete, Microwave
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: School of Engineering & Mathematical Sciences > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/17168

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