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Tie cable

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In the design of a 25-ft high U-shaped abutment for a concrete bridge, we have to tie the two wing walls to each other at the top with cables in order to control the overturning moment. The cables will be underground of course. What kind of cable may be used for this application and how could it be protected against corrosion? Is a low-relaxation 270K strand embeded in concrete a good alternative?
Javier Encinas