Abstract

CANO-BARRITA, P.F. de J.; BALCOM, B. J.  and  BREMNER, T.W.. Imaginología por resonancia magnética y la determinación de cloruro y sodio en mortero de cemento Pórtland. Ing. invest. y tecnol. [online]. 2007, vol.8, n.3, pp.147-155. ISSN 2594-0732.

Corrosion of the reinforcement is one of the main causes of deterioration of concrete structures. Chloride penetration into concrete due to either diffusion or absorption is an important contributor to the corrosion of embedded steel in concrete. In northern countries, deicing salts are a major factor in the deterioration of highways and in all countries, chlorides from seawater exacerbate the deterioration process. In order to assess the chloride penetration, destructive, low spatial resolution and time consuming methods are routinely used. The SPRITE Magnetic Resonance Imaging is a non-destructive technique that has demonstrated to be suitable to image materials possessing short life-time signals includ ing Pórtland cement based materials. This paper will demonstrate the ability of SPRITE MRI to determine the distribution of chlorides in mortar during NaCl solution capillary absorption or diffusion. In addition, preliminary experiments indicate that the technique can be used to image the distribution of chlorides in concrete/mortar containing normal Portland cement, which makes it possible to study the penetration of chlorides in cores taken from field concrete.

Keywords : Magnetic resonance; chlorides; non-destructive; diffusion; capillary absorption; mortar.

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