Citric acid is a weak organic acid, found naturally in many types of fruit. In the Drymix Industry, citric acid works as a general-purpose retarder, recommended for use in gypsum, OPC and calcium aluminate-based systems. Citric acid can also improve the flow and pumpability of preblended cementitious products. Citric acid is a weak organic acid, found naturally in many types of fruit. In the concrete admixture industry, citric acid works as a general-purpose retarder and can also improve the flow and pumpability of ready-mix concrete.