The article describes the traditional methods that are used in Russia for testing corrosion condition of reinforcement including peculiarities and disadvantages of it. The new methods of nondestructive testing which are used mainly in foreign countries are overviewed.

The principle and advantages of half-cell potential method of reinforcing steel in concrete is described. A new method of nondestructive testing corrosion condition of reinforcement is the method of measuring the electrical resistivity of concrete.

The article describes the principal of its application and the factors influencing on the measurement’s result. Data is presented for the practical use of the method during covering inspection of the Kurskiy station in Moscow.