Common rebar is made of unfinished tempered steel, making it susceptible to rusting. Normally the concrete cover is able to provide a pH value higher than 12 avoiding the corrosion reaction. Too little concrete cover can compromise this guard through carbonation from the surface, and salt penetration.
Quick Answer. Maglev trains can reach speeds of up to 361 mph. This was the fastest speed reached by the MLX01, which was measured on December 2, 2003. Executed on the Yamanashi maglev test line in Japan, the test run was administered by the Central Japan Railway Company and the Railway Technical Research Institute. Keep Learning.
This makes it four kilometers longer than t he worldâs longest regular rail tunnel which is the Gotthard Base Tunnel located in Switzerland at 56.32 km / 35 miles long. THE world's fastest metro system train is the Maglev or Transrapid which runs by way of magnetic levitation on the Longyang Road to Pudong International Airport line of the Shanghai Metro in China.