Concrete and paving glossary - V
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Vermiculite
An aggregate somewhat similar to perlite that is used as an aggregate
in lightweight roof decks and deck fills. It is formed from mica, a
hydrous silicate with the ability of expanding on heating to form lightweight
material with insulation quality. Used as bulk insulation and also as
aggregate in insulating and acoustical plaster and in insulating concrete.
See aggregate.
Vibrating screed
A machine designed to act as a vibrator while leveling freshly placed
concrete. See screed.
Vibration
Energetic agitation of freshly mixed concrete during placement by mechanical
devices, either pneumatic or electric, that create vibratory impulses
of moderately high frequency that assist in evenly distributing and
consolidating the concrete in the formwork. See compaction.
Vicat apparatus
A penetration device used to determine the setting characteristics
of hydraulic cements. See hydraulic
cement.
Visqueen
A 4 mil or 6 mil plastic sheeting often used for construction coverings.
See Polyethylene,
burlap, and curing
blanket.
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