SENSOR FOR DETERMINING THE DEPTH AND SPEED OF CARBONATION OF CEMENT

摘要

The invention relates to a pH sensor comprising: a strip of an electrical conductor; a metal oxide of at least one metal M on the electrical conductor strip, where M is a metal that presents at least two oxidation states, where the reduction potential between said oxidation states varies with the pH; a layer of dielectric material that partially covers the electrical conductor strip; and electrical connection means, characterised in that M does not form soluble species at pH 7, and in that the metal oxide is coated by a hydrogel polymer.