In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Comparative Study on Performance of Corrosion Protective Systems for Post-Tensioned Concrete Members
Author(s): In-Seok Yoon, Hyeongyeop Shin, and Thomas H.-K. Kang
Publication: Structural Journal
Appears on pages(s): 273-284
Keywords: accelerated corrosion test; corrosion protection; electrochemical method; plastic sheathing; post-tensioning; prestressing strands
Abstract:Prestressing strands subjected to high tensile stresses are likely to become vulnerable to hydrogen embrittlement due to stress corrosion. Corrosion protection should be selected for safety and durability of the post-tensioned concrete structure. In this study, performances of corrosion protective systems used in post-tensioning construction were evaluated by the electrochemical and weight loss measurement methods. Test specimens represented the bonded strand and unbonded strand with plastic sheathing in grouted multi-strand tendons, as well as unbonded single-strand tendon and bare-strand. Corrosion tests were carried out in accordance with PTI M55.1-12 with slight modifications. Tests conducted included: corrosion by chloride ion (Cl–) solution and corrosion by chloride ion and dissolved oxygen (Cl– + DO) solution. Test results indicated that the specimens using plastic sheathing showed 0.03 to 0.07 μA/cm2 average corrosion current densities, which can be regarded as insignificant corrosion condition in comparison with the average value of critical corrosion current densities of 0.15 or 0.17 μA/cm2 for strand-corrosion testing due to only chloride ion or both chloride ion and dissolved oxygen. Therefore, the plastic sheathing had the best protective performance among the tested specimens; even significant sheath damage was considered during the installation process. The corrosion resistances of specimens protected by cement grout and grease coating, respectively, were similar to each other. This study is expected to contribute to the selection of effective corrosion protective systems for construction of post-tensioned concrete structures requiring high durability.
Click here to become an online Journal subscriber