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Set Acceleration

Set accelerators work by accelerating cement hydration, which results in shortened setting times and increased early age strengths, particularly in cooler temperatures.

They increase the rate of early strength development and reduce time required for curing and protection

At one time, calcium chloride was the predominant accelerating admixture. However, it is now considered by many to be a main contributor to long-term concrete problems. In Europe, use of calcium chloride is banned for some applications. Chloride is considered to contribute to corrosion of reinforcement or embedded metal in concrete. In turn this corrosion has been associated with spalling, cracking, loss of bond and if left uncorrected can cause eventual failure of the element involved.

Now, chloride-free set accelerators are available based upon other chemicals. Some of these newer admixtures also can act as ASTM C494 Type E water-reducers.

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