A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal straps
The compressive strength of cylindrical columns of recycled aggregate concrete (RAC) is lower than that of equivalent normal concrete columns. Active confinement can recover some of such lower compressive strength, but limited research has examined the stress-strain behaviour of RAC cylinders with a...
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Sustainable Development Press Limited
2024-09-01
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| Series: | Sustainable Structures |
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| author | Ram Prasad Neupane Thanongsak Imjai Reyes Garcia U. Johnson Alengaram |
| author_facet | Ram Prasad Neupane Thanongsak Imjai Reyes Garcia U. Johnson Alengaram |
| author_sort | Ram Prasad Neupane |
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| description | The compressive strength of cylindrical columns of recycled aggregate concrete (RAC) is lower than that of equivalent normal concrete columns. Active confinement can recover some of such lower compressive strength, but limited research has examined the stress-strain behaviour of RAC cylinders with active confinement. This study proposes a new constitutive model for RAC cylinders actively confined with post-tensioned metal straps (PTMS). Using pneumatic tools, the PTMS technique involves applying a post-tensioning force to high-strength metal straps. RAC cylinders (⌀150×300 mm) with different confinement ratios (ρv = 0, 0.35, 0.52, 0.80 or 1.6) were subjected to axial compression tests to determine their maximum strength and axial strains. The RAC was produced using recycled concrete aggregate (RCA) as coarse aggregate, considering three compressive strengths: 15, 21 and 24 MPa. The test results indicate significant increases in strength and axial strains as the confinement ratio increased, with the strength increasing by 29% to 196%, and peak axial strains by 90% to 158% for ρv values of 0.35 and 1.6, respectively. Based on the test results and a regression analysis, a new stress-strain constitutive model is proposed to assess the effectiveness of the PTMS confinement on RAC. The results of this study promote the use of RAC in construction by demonstrating that the mechanical properties of RAC structural members can be effectively enhanced through the PTMS technique. |
| format | Article |
| id | doaj-art-2409816545f042ecb5e0eed061b543d8 |
| institution | Kabale University |
| issn | 2789-3111 2789-312X |
| language | English |
| publishDate | 2024-09-01 |
| publisher | Sustainable Development Press Limited |
| record_format | Article |
| series | Sustainable Structures |
| spelling | doaj-art-2409816545f042ecb5e0eed061b543d82025-02-01T08:42:10ZengSustainable Development Press LimitedSustainable Structures2789-31112789-312X2024-09-012410.54113/j.sust.2024.000049A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal strapsRam Prasad Neupane0Thanongsak Imjai1Reyes Garcia2U. Johnson Alengaram3School of Engineering and Technology, Walailak University, Nakhon Si Thammarat 80161, Thailand.School of Engineering and Technology, Walailak University, Nakhon Si Thammarat 80161, Thailand.Civil Engineering Stream, School of Engineering, The University of Warwick, Coventry CV4 7AL, UK.Department of Civil Engineering, Faculty of Engineering, Universiti Malaya, Kuala Lumpur 50603, Malaysia.The compressive strength of cylindrical columns of recycled aggregate concrete (RAC) is lower than that of equivalent normal concrete columns. Active confinement can recover some of such lower compressive strength, but limited research has examined the stress-strain behaviour of RAC cylinders with active confinement. This study proposes a new constitutive model for RAC cylinders actively confined with post-tensioned metal straps (PTMS). Using pneumatic tools, the PTMS technique involves applying a post-tensioning force to high-strength metal straps. RAC cylinders (⌀150×300 mm) with different confinement ratios (ρv = 0, 0.35, 0.52, 0.80 or 1.6) were subjected to axial compression tests to determine their maximum strength and axial strains. The RAC was produced using recycled concrete aggregate (RCA) as coarse aggregate, considering three compressive strengths: 15, 21 and 24 MPa. The test results indicate significant increases in strength and axial strains as the confinement ratio increased, with the strength increasing by 29% to 196%, and peak axial strains by 90% to 158% for ρv values of 0.35 and 1.6, respectively. Based on the test results and a regression analysis, a new stress-strain constitutive model is proposed to assess the effectiveness of the PTMS confinement on RAC. The results of this study promote the use of RAC in construction by demonstrating that the mechanical properties of RAC structural members can be effectively enhanced through the PTMS technique.axial behaviouractive confinementrecycled aggregate concreteultimate strengthpeak strainstress-strain model |
| spellingShingle | Ram Prasad Neupane Thanongsak Imjai Reyes Garcia U. Johnson Alengaram A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal straps Sustainable Structures axial behaviour active confinement recycled aggregate concrete ultimate strength peak strain stress-strain model |
| title | A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal straps |
| title_full | A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal straps |
| title_fullStr | A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal straps |
| title_full_unstemmed | A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal straps |
| title_short | A new constitutive model for recycled aggregate concrete cylinders actively confined with post-tensioned metal straps |
| title_sort | new constitutive model for recycled aggregate concrete cylinders actively confined with post tensioned metal straps |
| topic | axial behaviour active confinement recycled aggregate concrete ultimate strength peak strain stress-strain model |
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