Impact of welan gum on tricalcium aluminate-gypsum hydration

► Adsorption characteristics of welan gum on C3A and ettringite have been studied. ► C3A-gypsum hydration behavior and the hydration products are examined in L/S = 3. ► Welan gum retards the process of C3A-gypsum hydration. ► The addition of welan gum changes the nucleation growth of ettringite.