In addition, in the presence of 5 mmol L -1 of tartrate and 8 mmol L -1 of Ca(OH) 2 , the dissolution of C 3 S was reduced below the limit of detection (LoD) of the ICP-OES for silicon ( 0.001 mmol L -1 ) even after 20 minutes of dissolution (Figure ). This suggests that the rate in these conditions is at least 10 times lower than the rate measured at 6 mmol L -1 , further highlighting the very strong inhibition of the dissolution of C 3 S in the presence of tartrate. Similarly to citrate, this may be attributed to tartrate adsorption onto the surface of C 3 S that can inhibit the dissolution close to saturation, although the results obtained herein suggest a stronger affinity of tartrate with C 3 S surface compared to citrate.