Concrete and paving glossary - U
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Unbonded construction
Posttensioned concrete construction in which the tendons
are not grouted to the surrounding concrete. See posttensioning
and grout.
Unit water content
The quantity of water per unit volume of freshly mixed concrete, often
expressed as gallons or pounds per cubic yard. This is the quantity
of water on which the water cement ratio is based, and does not include
water absorbed by the aggregate. See cement
mixture.
Unreinforced concrete
Concrete made without steel reinforcing bars. See reinforced
concrete and rebar.
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