Civil Engineering Dictionary Terms : V

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Sr.TermDefinition
1Varried FlowFlow that had a changing depth along the water course. The variation is with respect to location, not time.
2Vibrated ConcreteConcrete consolidated by vibration from an internal or external vibrator. It requires very much less water for effective placing than does concrete compacted by punning, therefore it is much stronger. The formwork, however, must also be stronger when the concrete is to be vibrated. Concrete in hollow-tile floors is not vibrated.
3VibratorA tool which vibrates at a speed form 3,000 to 10,000 rpm and is inserted into wet concrete or applied to the formwork to compact the concrete. Concrete vibrators are of six types: A) For precast work: (1) Platform vibrators, small vibrators carried by one or two men moving up and down a pile or lamp post. (2) Table vibrators, which may vibrate vertically for heavy work or with rotary movement for light pieces. B) For concrete cast in place: (3) Internal vibrators are the best known type. (4) External vibrators are used more in the factory than on the site because of the extra strength required for the formwork. External vibrators are also used for road slabs. (5) A hand screed 12 feet long requires one vibrator, for greater lengths two vibrators are fixed on the screed. C) For very large capacities: (6) Concrete-vibrating machines are used. Vibrators are also used for the compaction of loose soils.

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