Materiales de Construcción, Vol 50, No 257 (2000)

Study of the moisture content gradient in a cementitious material by measuring its impedance and gamma-densitometry


https://doi.org/10.3989/mc.2000.v50.i257.414

J. P. Guilbaud
Laboratorio Central des Ponts et Chaussées, France

H. Carvalho
Laboratorio Central des Ponts et Chaussées, France

V. Baroghel-Bouny
Laboratorio Central des Ponts et Chaussées, France

A. Raharinaivo
Laboratorio Central des Ponts et Chaussées, France

Abstract


The local water content in cementitious material depends on the equilibrium between its atmospheric environment and its bulk properties. So, the moisture profile in material can vary with time. The object of this study is to follow the change of this profile by measuring the electrical impedance of the material with pairs of small wires embedded at different depths.
This method was applied to young cement paste specimens. The results obtained show that this method is quite satisfactory. The best frequency to be applied, is about 50 or 100 Hz. These results were compared with those obtained with gamma-densitometry.

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