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.
The Hyperloop train concept would travel faster than this because it runs within a low-pressure vacuum tube that's had 99.9% of the air inside removed; with most of the air gone, most of the drag is gone too. The Hyperloop is predicted to have top speeds of about 760 mph. Buckle up for the Hyperloop ride.