NaOH (1 mol L -1 ) into 150 mL water at a constant speed of 0.4 mL min -1 . For the C-S-H nucleation experiments, a titrand solution of 100 mL Na 2 SiO 3 (3.7 mmol L -1 ) and 20 mL NaOH (1 mol L -1 ) was used and CaCl 2 (0.03 mol L -1 ) solution was dosed at a constant speed of 0.08 mL min -1 . The respective amount of additive was dissolved in the titrand solution for experiments with additives. For ICP measurements of the C-S-H nucleation experiment, samples of 1 mL were taken after each 0.25 mmol L -1 of calcium addition and immediately filtered using a 0.1 µm syringe filter with PES membrane. The samples were diluted by a factor of 100, acidified using 1 mL HNO 3 (6 mol L -1 ) and analyzed within one day.