For the past 25 to 30 years, preferably heat treated precast concrete members (> 70 degrees C) manufactured with high early strength Portland Cements with higher sulphate contents, under adverse exposure conditions have sometimes exhibited structural damage in the form of map cracking and loss of strength. These damages are characterized as Damaging Late Ettringite Formation (DLEF). DLEF is caused by a formation, destruction and a later renewed formation of ettringite ocurring preferably after maximum heat treatment (HT) at greater than or equal to 70 degrees C of pastes, mortars and concretes made with high strength Portland cements.