Corrosion of Post-Tension Tendons Associated 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 for the embedded high-strength steel strand. Although generally used in good engineerin...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-05-01
|
| Series: | Materials Proceedings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2673-4605/6/1/29 |
| _version_ | 1797579058228232192 |
|---|---|
| author | Samanbar Permeh Kingsley Lau |
| author_facet | Samanbar Permeh Kingsley Lau |
| author_sort | Samanbar Permeh |
| collection | DOAJ |
| description | 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 for the embedded high-strength steel strand. Although generally used in good engineering practice, cases of PT tendon corrosion have been documented relating to inadequate detailing for joints, development of grout bleed water, and, more recently in the past several years, segregation of thixotropic grouts. In the latter case, cases of thixotropic grouts (which have been developed to mitigate grout bleeding), developed physically and chemically deficient grout, have been characterized to have high moisture content and elevated sulfate ion concentrations. The early presence of elevated sulfate ion concentrations in the deficient grout was attributed to hindering stable steel passivation. Case studies of PT corrosion associated with grouts with elevated sulfate concentrations are presented followed by a review of electrochemical techniques and measurements used to identify the role of sulfates in steel corrosion in alkaline solutions such as polarization techniques, electrochemical impedance spectroscopy, and electrochemical noise. |
| first_indexed | 2024-03-10T22:30:29Z |
| format | Article |
| id | doaj.art-e8a0c396fe294099adfd92272457bfd3 |
| institution | Directory Open Access Journal |
| issn | 2673-4605 |
| language | English |
| last_indexed | 2024-03-10T22:30:29Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials Proceedings |
| spelling | doaj.art-e8a0c396fe294099adfd92272457bfd32023-11-19T11:47:43ZengMDPI AGMaterials Proceedings2673-46052021-05-01612910.3390/CMDWC2021-10036Corrosion of Post-Tension Tendons Associated with Segregated GroutSamanbar Permeh0Kingsley Lau1Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USADepartment of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USAPost-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 for the embedded high-strength steel strand. Although generally used in good engineering practice, cases of PT tendon corrosion have been documented relating to inadequate detailing for joints, development of grout bleed water, and, more recently in the past several years, segregation of thixotropic grouts. In the latter case, cases of thixotropic grouts (which have been developed to mitigate grout bleeding), developed physically and chemically deficient grout, have been characterized to have high moisture content and elevated sulfate ion concentrations. The early presence of elevated sulfate ion concentrations in the deficient grout was attributed to hindering stable steel passivation. Case studies of PT corrosion associated with grouts with elevated sulfate concentrations are presented followed by a review of electrochemical techniques and measurements used to identify the role of sulfates in steel corrosion in alkaline solutions such as polarization techniques, electrochemical impedance spectroscopy, and electrochemical noise.https://www.mdpi.com/2673-4605/6/1/29post-tensionbridgecorrosiongroutsulfateEIS |
| spellingShingle | Samanbar Permeh Kingsley Lau Corrosion of Post-Tension Tendons Associated with Segregated Grout Materials Proceedings post-tension bridge corrosion grout sulfate EIS |
| title | Corrosion of Post-Tension Tendons Associated with Segregated Grout |
| title_full | Corrosion of Post-Tension Tendons Associated with Segregated Grout |
| title_fullStr | Corrosion of Post-Tension Tendons Associated with Segregated Grout |
| title_full_unstemmed | Corrosion of Post-Tension Tendons Associated with Segregated Grout |
| title_short | Corrosion of Post-Tension Tendons Associated with Segregated Grout |
| title_sort | corrosion of post tension tendons associated with segregated grout |
| topic | post-tension bridge corrosion grout sulfate EIS |
| url | https://www.mdpi.com/2673-4605/6/1/29 |
| work_keys_str_mv | AT samanbarpermeh corrosionofposttensiontendonsassociatedwithsegregatedgrout AT kingsleylau corrosionofposttensiontendonsassociatedwithsegregatedgrout |