'doubly protected reinforcing members in concrete am'

摘要

A concrete structure (11) is reinforced with steel rebars (12) coated with essentially pure aluminum (15) upon which aluminum coating is an aluminum oxide layer (15"). This layer of aluminum oxide is in direct contact with the concrete. The Al-coated rebars may be protected in a galvanic circuit using magnesium or other metal baser as a sacrificial anode, or the rebars are cathodically protected with an impressed cathodic current, the current density of which is derived by sensing the corrosion potential at a sensing member of essentially pure aluminum embedded in the concrete, or in concrete outside a zone immediately surrounding the rebars, measuring the corrosion potential at the sensing member relative to a reference electrode until the...