The present invention relates generally to the field of material durability and more specifically to the assessment of chloride concentration in porous and composite materials, such as reinforced concrete, pre-stressed concrete or mixed steel-concrete structures. The invention relates more particularly to a system and a method for assessing chloride concentration in a predetermined area of a porous or composite material and to a sensor used in this system and method.
The invention relates to a system for assessing chloride concentration at one predetermined area of a porous or composite material, such as a reinforced concrete structure, comprising a sensor (1) embedded in the predetermined area of the material, an analyser (2) connected to the sensor, and a processing module (4) connected to the analyser. The sensor (1) comprises two facing or coplanar electrodes (11), called electrodes, an intermediate layer (13) arranged between said electrodes, said intermediate layer being in contact with the material of the first area of the structure and comprising calcium aluminates. The analyser (2) is configured to apply an alternate current between the electrodes and output an impedance value or capacitance value of the intermediate layer. The processing module (4) is configured to compute a chloride concentration assessment in the predetermined area of the material based on the impedance value or capacitance value outputted by the analyser.