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.