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what are the admixtures?
in Civil Engineering by  

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Admixtures are substances that are added to concrete to modify the properties of the concrete(ie. to improve the workability, to accelerate or retard the setting, etc..)
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They r the chemical to expedite or slow down the process of hyderation. They are used to
Delay the setting time
Increase the setting time
increase the strength of concrete.
improve the workability

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