Identification of high alumina cement in concrete by the use of the pachometer

Abstract

The observation of the premature degradations detected in High Alumina concretes due to the transformation and carbonation of this kind of cement has promoted the interest to develop in-situ testing methods for the fast Identification of HAC presence. In present work, preliminary results are given on the use of magnetic methods (pachometer), usually employed in the concrete cover verification, to identify the existence of HAC in a concrete. The laboratory results have been verified in practice and show that HAC can be clearly distinguished of an OPC concrete with the pachometer used in present experimentation. The research has also indicated that fly ash cements as aluminous one, have a lower magnetic reluctance.