Review of Electrochemical Testing to Assess Corrosion of Post-Tensioned Tendons with Segregated Grout

Post-tensioned (PT) construction incorporating bonded tendons with cementitious grouts has been used for highway bridges. The tendon duct and the encapsulating grout materials provide barrier corrosion protection embedded high-strength steel strand. Although generally in good engineering practice, cases of PT have documented relating to inadequate detailing joints development bleed water. Recently, past several years, unexpected severe localized strand related segregation thixotropic grouts. In latter case, (that developed mitigate bleeding) formed physical chemical deficiencies that characterized high moisture content elevated sulfate ion concentrations. early presence concentrations deficient hinders stable passivation. mechanism can be complicated due compounding effects deficiency, content, pore water pH, ions. There remains interest reliably assess grout. A review electrochemical techniques test methods earlier research by authors identify role sulfates on alkaline solutions is presented. It was evident different testing reveal various aspects strands open-circuit potential linear polarization method could differentiate activity between hardened environments but did not corrosion. Electrochemical impedance spectroscopy useful differentiation its bulk electrical properties. Potentiodynamic noise technique were metastable pitting representative