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A concrete order must include the amount of
concrete, cement type and supplementary cementing materials, necessary
slump at discharge point, coarse
aggregate maximum size, air content, mix proportions or exposure
class, admixture type, concrete temperature, concrete density,
and 28 day
compressive strength and/or ratio of water to cementing materials. The
ingredients for a concrete batch are measured by mass or
volume and added to the mixture. Most batchs
are measured by mass because of the volume inaccuracies of measuring
aggregates, especially wet sand. Concrete should be mixed
until it appears uniform and the contents are distributed evenly.
Concrete can be stationary mixed at the job site, ready
mixed and transported to the job site, continuously mixed as
ingredients are added to a job site Mobile Batcher Mixer truck,
and mixed by High Energy Mixers. |
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