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Study of use of ultrasound technology to prepare polymer-impregnated concrete

✍ Scribed by Han Wu; Eric W. Brooman

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
721 KB
Volume
23
Category
Article
ISSN
0008-8846

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✦ Synopsis

Low intensity ultrasound waves (20 kHz, 0.19 to 0.57 W/cm 2 based on concrete area) have been applied to enhance the efficiency of impregnating a monomer into hardened concrete, without prior drying, for subsequent in situ polymerization. It was found that methyl methacrylate could be impregnated into partly air-dried Portland cement concrete, without removing the free water in the specimen, to approximately 80 percent of the depth of that into a similar, previously oven-dried specimen. A systematic study has been carried out to assess the relationship between impregnation depth and the following parameters: ultrasound energy density, impregnation time, gap distance between the ultrasound horn and the specimen surface, and the applied DC voltage gradient. The results of the experiments and a proposed mechanism for the ultrasound enhancement are presented in this paper.

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