ground protection boards 10mm 80 T load capacity Mexico 10mm white Ground protection mats 80 tons load capacity The load carrying capacity of a 9″x9″ lumn with 4 bars of 12 MM steel rods upto a height of 10′, with M15 ncrete, is 30 Tons. That is the minimum, but in some practices, a minimum of 9″x12″ lumn is designed for slenderness ration factor.