... hydrated Portland cement mortar after 28 days (PC 1, PC 2, PC3 (cement composition in [125]) and De Weerdt [123]) and 90 days (De Weerdt [124], [114]) and B) hydrated 65 Portland cement — 35%... R.J.Kirkpatrick and X.-D Cong, An Introduction to 27Al and 29Si NMR Spectroscopy of Cements and Concretes, in Application of NMR Spectroscopy to Cement Science, 55–75, Gordon and Breach Reading England [11]... material, and constant content by weight of cementitious material Thermodynamics applied to cement science and especially to cement hydration is very successful and valuable if used with caution Thus