Concrete and paving glossary - O
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Ottawa sand
Sand used as a standard in testing hydraulic cements by means of mortar
test specimens. This type of sand is produced by processing silica rock
particles obtained by hydraulic mining of the orthoquartzite situated
in open-pit deposits near Ottawa, Illinois; naturally rounded grains
of nearly pure quartz. See hydraulic
cement.
Outside radius
The formed outside radius of a bend.
Overvibration
Excessive use of vibrators during placement of freshly mixed concrete,
causing segregation and excessive bleeding. See bleeding
and segregation.
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