From everything that i have lernt in Structural analysis (curtin civil engineering) Reo is only used in concrete to take the tension component, as concrete is poor at withstanding tension but exceptionally good at withstanding compression. unless your pier is withstanding exorbanant amounts of lateral force then the reo is just for your minds ease
my 2c worth! and im sure there are a few other civ engineers about that could second or maybe put it to sleep