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| Shrink Mixed Concrete |
Concrete that
is partially mixed in a plant mixer and then discharged into the drum of the
truck mixer for completion of the mixing is called shrink mixed concrete.
Central mixing plants that include a stationary, plant-mounted mixer are often
actually used to shrink mix, or partially mix the concrete. The amount of
mixing that is needed in the truck mixer varies in these applications and
should be determined via mixer uniformity tests. Generally, about thirty turns
in the truck drum, or about two minutes at mixing speed, is sufficient to
completely mix shrink-mixed concrete.
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