The impact of cement parameters on Delayed Ettringite Formation

Delayed Ettringite Formation (DEF) in concrete is likely to lead to swelling and cracking in structures which have undergone early age heating to a temperature of over 65 degrees C. Application of a method that accelerates this process has made it possible to study the impact of cement properties on DEF. For two temperatures reached by the concrete (75 degrees C or 85 degrees C), the study considers a domain defined by the sulphate content [2.6-3.6%], the alkali content [0.5-1%] and the Blaine specific area [3330-4635 cm(2)/g] of the cement. The impact of these parameters and the interactions between them on swelling are discussed. Monitoring of the dynamic elastic modulus of the concretes shows that this property may be reduced by DEF, but that it may increase again once the swelling process has ceased, probably due to the gradual filling of voids by ettringite formed under conditions of limited supersaturation. (C) 2011 Elsevier Ltd. All rights reserved.