After establishing the dissolution-inhibiting effect of hydrochloric acid, the influence of different strong acids on the early hydration of CAC was investigated at a constant proton dosage of 82 µmol/g CAC , e.g., a diprotic acid like sulfuric acid was used at half the concentration of a monoprotic acid like hydrochloric acid. In addition to hydrochloric acid, we selected perchloric, nitric, and sulfuric acid.