About Concrete Tank DeteriorationTo the editor:According to the Portland Cement Association, “ettringite (calcium sulfoaluminate), is found in all Portland cement concretes. “Any form of attack or disintegration of concrete by freeze-thaw action, alkali-silica reactivity (ASR), or other means, accelerates the rate at which ettringite leaves its original location in the paste to go into solution and recrystallizes in larger spaces such as voids or cracks. “Both water and space must be present for the crystals to form. The space is often provided by cracks that form due to damage caused by frost action, ASR, drying shrinkage, or other mechanisms. Ettringite
