When 30 g/kg Cl− was added at 373 h, the SCC crack growth rate increased immediately and finally achieved a steady growth rate of 2.5 × 10−6 mm/s. The crack growth rate dropped to 1.87 × 10−7 mm/s on changing to HWC at ∼407 h.
The addition of Cl− was stopped at 660 h and the residual Cl− in the water was removed by demineralizer over ∼2 h.