A method of determining the corrosion in a reinforced concrete structure by means of using at least one sensor incorporated in the reinforced concrete structure, said sensor comprising: - a support coupling the sensor to a bar of the frame of the concrete structure; - a sensor element secured to the frame by means of the support ; - a temperature sensor ; - conduction and connection elements which allow electrically insulating or connecting the frame , the sensor element and the temperature sensor by means of an external connector that is arranged to act as an electrical switch; - a metal connecting clamp connecting the frame with the conduction and connection elements ; - the external connector attached to the sensor element and to the frame by means of the conduction and connection elements , and formed by a connector inside a connection box embedded in the surface of the concrete structure; characterized in that the method comprises the steps of: a) connecting external measuring equipment to the external connector of the sensor, establishing the connection between the external measuring equipment and each of the sensor element , the temperature sensor and the frame ; b) determining the temperature of the sensor element based on the measurement obtained from the temperature sensor ; c) determining the electrical resistance conferred by the concrete; d) determining the corrosion potential value by means of a potentiometric measurement of the difference in electric potential between a working electrode of the sensor and a reference electrode; e) applying pulse trains to the sensor, for calculating the polarization resistance and intensity of corrosion; f) obtaining information from the sensor; and g) calculating the polarization resistance and intensity of corrosion. - a support coupling the sensor to a bar of the frame of the concrete structure; - a sensor element secured to the frame by means of the support ; - a temperature sensor ; - conduction and connection elements which allow electrically insulating or connecting the frame , the sensor element and the temperature sensor by means of an external connector that is arranged to act as an electrical switch; - a metal connecting clamp connecting the frame with the conduction and connection elements ; - the external connector attached to the sensor element and to the frame by means of the conduction and connection elements , and formed by a connector inside a connection box embedded in the surface of the concrete structure; a) connecting external measuring equipment to the external connector of the sensor, establishing the connection between the external measuring equipment and each of the sensor element , the temperature sensor and the frame ; b) determining the temperature of the sensor element based on the measurement obtained from the temperature sensor ; c) determining the electrical resistance conferred by the concrete; d) determining the corrosion potential value by means of a potentiometric measurement of the difference in electric potential between a working electrode of the sensor and a reference electrode; e) applying pulse trains to the sensor, for calculating the polarization resistance and intensity of corrosion; f) obtaining information from the sensor; and g) calculating the polarization resistance and intensity of corrosion. <EOS>