BETONTECHNIK (BETONBAU); ZEMENTBETON (BAUSTOFFE); BETONZUSATZMITTEL (BAUSTOFFE); HYDRATATION MINERALISCHER BINDEMITTEL (GIPS-, KALK- UND ZEMENTINDUSTRIE); EISENVERBINDUNGEN (ANORGANISCHE CHEMIE); ZITRONENSÄURE UND DERIVATE (ALIPHATISCHE HYDROXYCARBONSÄUREN); CONCRETING TECHNOLOGY (CONCRETE CONSTRUCTION); CEMENT CONCRETE (BUILDING MATERIALS); CONCRETE ADMIXTURES (BUILDING MATERIALS); HYDRATATION OF MINERAL BINDERS (LIME, CEMENT AND CONCRETE INDUSTRY); IRON COMPOUNDS (INORGANIC CHEMISTRY); CITRIC ACID AND DERIVATIVES (ALIPHATIC HYDROXYCARBOXYLIC ACIDS)