A chemical added to concrete mix to change how it behaves — making it set faster, slower, easier to pour, or stronger.
A material other than water, aggregates, cementitious materials, and fiber reinforcement that is added to concrete before or during mixing to modify its properties. Admixtures can accelerate or retard set time, increase workability, reduce water demand, entrain air, or improve durability. Common types include water reducers (plasticizers), accelerators, retarders, and corrosion inhibitors.
A retarding admixture was specified for the summer pour to extend the working time in high temperatures.
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