Corrosivity evaluation method for concrete foundation of power transmission line

The invention discloses a method for evaluating the corrosivity of a concrete foundation of a power transmission line. The method comprises the following steps: judging whether the environment of the power transmission line is a general environment or a chlorine salt environment; in a general environment, a local environment influence coefficient is obtained, the environment temperature, the environment relative humidity, the protective layer thickness, the steel bar diameter influence coefficient and the concrete strength are subjected to on-site investigation and detection, and the concrete carbonization coefficient is subjected to on-site measurement; in the chlorine salt environment, the concentration of chloride ions on the surface of the concrete is detected, and the critical chloride ion concentration is determined; based on a concrete protection layer rust expansion cracking limit state principle, a protection layer rust expansion cracking evaluation coefficient is calculated; and carrying out corrosi