Sodium Gluconate
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A very commonly used concrete set retarder is sodium gluconate. Sodium Gluconate is a water-soluble salt that is derived from gluconic acid. It works by chelating with the calcium ions in the cement, which slows down the rate of the chemical reaction that causes the concrete to set. Sodium Gluconate is particularly effective in retarding the setting time of concrete in hot weather conditions, which can help to prevent cracking and other forms of damage.