After three hours of hydration, the reference mixture reached a storage modulus of 40 MPa. The relative differences between the samples are significantly smaller than those for the initial G ′ values at 3 min. The highest dosage of Na 2 SO 4 resulted in the smallest G ′ value of approx. 9 MPa. The 3 h storage modulus was only minimally affected by higher salt dosages. These findings confirm that the very early viscoelastic properties of the C 3 A suspension can be significantly modified by varying the sodium salts and their dosages.