Hence, the evolution of the storage moduli serves as a reliable indicator of structural build-up in the C 3 A pastes. To further clarify the effect of varying sodium salt dosages, we plotted the storage modulus G ′ at the age of 3 min and after 3 h against each salt's dosage (Figure ). A significant decrease in the initial storage modulus was observed with increasing dosages of sodium sulfate. The addition of NaCl at 400 µmol g -1 led to an 84 % initial reduction in G ′ , followed by only modest additional reductions at higher dosages. Finally, the initial storage moduli for all NaNO 3 containing samples were also lower than the reference. At the lower concentrations of 400 µmol g -1 and 1000 µmol g -1 , the reduction is small but reaches 74 % at the highest dosage of 2000 µmol g -1 .