Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation
Offshore oil and gas pipelines are susceptible to corrosion and need rehabilitation to keep them operating in-service conditions. Fibre composite filled with epoxy-based grout is emerging as an effective repair and rehabilitation system for offshore pipelines performing underwater. In such applicati...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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AIMS Press
2016-07-01
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| Series: | AIMS Materials Science |
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| Online Access: | http://www.aimspress.com/Materials/article/854/fulltext.html |
| _version_ | 1818025152558923776 |
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| author | Allan Manalo Luke P. Djukic Md Mainul Islam Thiru Aravinthan Md Shamsuddoha |
| author_facet | Allan Manalo Luke P. Djukic Md Mainul Islam Thiru Aravinthan Md Shamsuddoha |
| author_sort | Allan Manalo |
| collection | DOAJ |
| description | Offshore oil and gas pipelines are susceptible to corrosion and need rehabilitation to keep them operating in-service conditions. Fibre composite filled with epoxy-based grout is emerging as an effective repair and rehabilitation system for offshore pipelines performing underwater. In such applications, the infill grout is often subjected to moisture and elevated temperature along with compressive, tensile and localised stresses at the defect. Current standards and practices for composite repairs suggest detailed investigation of the fibre reinforced sleeve, while the characterisation of the infill material is yet to be conducted for performance evaluation. The present work investigates the mechanical and thermal properties of three epoxy grouts as candidates for infill in a grouted sleeve repair for underwater pipeline. An understanding on the effect of hygrothermal ageing on the grout properties for defining the period of 1000 hours as “long-term” according to ISO/TS 24817, in comparison to their unconditioned state, is also presented. The compressive and tensile strength of the unconditioned grouts ranges from 100–120 MPa, and 19–32 MPa, respectively, which indicates that these grouts are suitable for structural rehabilitation of the pipelines. Moreover, the glass transition temperatures, T<sub>g</sub> and T<sub>t</sub> of the unconditioned grouts are found to be within the ranges of 50–60 °C, and 80–90 °C, respectively, which are reduced by about 20°C after conditioning. |
| first_indexed | 2024-12-10T04:11:34Z |
| format | Article |
| id | doaj.art-a2c70e2368f6418580ef6017b73f718a |
| institution | Directory Open Access Journal |
| issn | 2372-0484 |
| language | English |
| last_indexed | 2024-12-10T04:11:34Z |
| publishDate | 2016-07-01 |
| publisher | AIMS Press |
| record_format | Article |
| series | AIMS Materials Science |
| spelling | doaj.art-a2c70e2368f6418580ef6017b73f718a2022-12-22T02:02:43ZengAIMS PressAIMS Materials Science2372-04842016-07-013383285010.3934/matersci.2016.3.832matersci-03-00832Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitationAllan Manalo0Luke P. DjukicMd Mainul IslamThiru Aravinthan1Md Shamsuddoha2Centre for Future Materials, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland 4350, AustraliaCentre for Future Materials, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland 4350, AustraliaCentre for Future Materials, Faculty of Health, Engineering and Sciences, University of Southern Queensland, Toowoomba, Queensland 4350, AustraliaOffshore oil and gas pipelines are susceptible to corrosion and need rehabilitation to keep them operating in-service conditions. Fibre composite filled with epoxy-based grout is emerging as an effective repair and rehabilitation system for offshore pipelines performing underwater. In such applications, the infill grout is often subjected to moisture and elevated temperature along with compressive, tensile and localised stresses at the defect. Current standards and practices for composite repairs suggest detailed investigation of the fibre reinforced sleeve, while the characterisation of the infill material is yet to be conducted for performance evaluation. The present work investigates the mechanical and thermal properties of three epoxy grouts as candidates for infill in a grouted sleeve repair for underwater pipeline. An understanding on the effect of hygrothermal ageing on the grout properties for defining the period of 1000 hours as “long-term” according to ISO/TS 24817, in comparison to their unconditioned state, is also presented. The compressive and tensile strength of the unconditioned grouts ranges from 100–120 MPa, and 19–32 MPa, respectively, which indicates that these grouts are suitable for structural rehabilitation of the pipelines. Moreover, the glass transition temperatures, T<sub>g</sub> and T<sub>t</sub> of the unconditioned grouts are found to be within the ranges of 50–60 °C, and 80–90 °C, respectively, which are reduced by about 20°C after conditioning.http://www.aimspress.com/Materials/article/854/fulltext.htmlpipelineoffshoregroutinfillrepairrehabilitation |
| spellingShingle | Allan Manalo Luke P. Djukic Md Mainul Islam Thiru Aravinthan Md Shamsuddoha Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation AIMS Materials Science pipeline offshore grout infill repair rehabilitation |
| title | Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation |
| title_full | Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation |
| title_fullStr | Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation |
| title_full_unstemmed | Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation |
| title_short | Effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation |
| title_sort | effect of hygrothermal conditioning on the mechanical and thermal properties of epoxy grouts for offshore pipeline rehabilitation |
| topic | pipeline offshore grout infill repair rehabilitation |
| url | http://www.aimspress.com/Materials/article/854/fulltext.html |
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