Application of the X-ray absorption technique for monitoring hydration and setting processes in cementitious composites

Abstract

This paper presents an application of the X-ray absorption technique for monitoring hydration and setting processes in cementitious composites. The method, which is a relatively new approach in concrete research, is based on the measurement of attenuation of a finely collimated beam of X-rays by a sample. The absorption of X-rays by sample is proportional to the material density. Changes of density in a function of time can be related to the absorption and moisture transport within porous media. Although interpretation of the results may be very problematic, chemical and physical reactions associated with hydration may be qualitatively analysed by this technique. This paper is focused on a setting process of cement mortars modified by superabsorbent polymers. © 2013 WIT Press.