On-line monitoring the corrosion rate of reinforcing steel in concrete under natural conditions using bimetallic batch sensors along the coast of Khanh Hoa (Vietnam) oleh Cao Nhat Linh, Dmitry S. Shevtsov, Ilya D. Zartsyn, Nguyen Van Chi, Nguyen Nhu Hung, Nguyen Van Hoa, Oleg A. Kozaderov, Alexander N. Zyablov