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Sodium metabisulfite  is not a common additive in concrete. Concrete typically consists of cement, aggregates (such as sand and gravel), water, and optional additives like admixtures. While there are various concrete admixtures available for specific purposes, sodium metabisulfite is not a standard component in concrete mixes. However, it's worth noting that there are other chemicals and admixtures used in the concrete industry for specific purposes, such as:  Set Retarders:  These are additives that slow down the setting time of concrete. This can be beneficial in situations where extended workability or placement time is required. Air-Entraining Agents:  These agents introduce microscopic air bubbles into the concrete, improving its resistance to freeze-thaw cycles and increasing workability. Water-Reducing Admixtures:  Also known as plasticizers, these admixtures reduce the amount of water needed in the concrete mix while maintaining workability. They can enhance the strength an

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