Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical Study
Intrinsically, lightweight aggregate concrete (LWAC) suffers from the low compressive strength and deformation capacity. This restricts the use of LWAC mainly to non-structural applications. Several studies have highlighted the potential of synthetic fiber-reinforced polymer (FRP) jackets for improv...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/12/9/1357 |
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| author | Suniti Suparp Krisada Chaiyasarn Nazam Ali Chaitanya Krishna Gadagamma Ahmed W. Al Zand Ekkachai Yooprasertchai Qudeer Hussain Panuwat Joyklad Muhammad Ashraf Javid |
| author_facet | Suniti Suparp Krisada Chaiyasarn Nazam Ali Chaitanya Krishna Gadagamma Ahmed W. Al Zand Ekkachai Yooprasertchai Qudeer Hussain Panuwat Joyklad Muhammad Ashraf Javid |
| author_sort | Suniti Suparp |
| collection | DOAJ |
| description | Intrinsically, lightweight aggregate concrete (LWAC) suffers from the low compressive strength and deformation capacity. This restricts the use of LWAC mainly to non-structural applications. Several studies have highlighted the potential of synthetic fiber-reinforced polymer (FRP) jackets for improving the substandard properties of the LWAC. However, the high costs associated with FRP jackets are generally a concern. This study identifies hemp fiber-reinforced rope polymer (FRRP) wraps as a potential alternative to the synthetic FRP jackets. The salient features of hemp FRRP include its low cost and easy availability. Therefore, the main question that needs to be answered is: can hemp FRRP strengthen LWAC as a low-cost alternative to synthetic FRP jackets? To quantitatively explain the effects of lightweight aggregates on concrete compressive strength, 24 concrete cylinders were tested in three groups. Group 1, 2, and 3 cylinders comprised 0, 50, and 100% of lightweight aggregates as natural aggregate replacements. The peak stress of the concrete was reduced by 34% and 49% in the presence of 50% and 100% lightweight aggregates, respectively. It was concluded that a single layer of hemp FRRP on Group 2 cylinders (i.e., 50% aggregate replacement) was sufficient to enhance the peak stress to the same level as that of the control cylinder in Group 1 (i.e., fabricated using natural aggregates only). At the same time, it took two layers of external FRRP on Group 3 cylinders to achieve the same strength. A positive correlation between the peak stress of the LWAC and the number of hemp FRRP layers was observed. Nonetheless, Group 1 and 3 cylinders formed the upper and lower bounds in terms of peak stress for the same level of confinement. Further to the interest, three layers of hemp FRRP shifted brittle compressive stress–strain response to a bi-linear response for all amounts of lightweight aggregates. Several existing analytical peak stress models were assessed in predicting the experimental results. From the results, it was inferred that none of these models predicted the compressive strength of all three groups of cylinders consistently. |
| first_indexed | 2024-03-10T00:32:33Z |
| format | Article |
| id | doaj.art-75b0b3cf3dc14105a9f4d460d287cf6a |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-10T00:32:33Z |
| publishDate | 2022-09-01 |
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| series | Buildings |
| spelling | doaj.art-75b0b3cf3dc14105a9f4d460d287cf6a2023-11-23T15:23:16ZengMDPI AGBuildings2075-53092022-09-01129135710.3390/buildings12091357Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical StudySuniti Suparp0Krisada Chaiyasarn1Nazam Ali2Chaitanya Krishna Gadagamma3Ahmed W. Al Zand4Ekkachai Yooprasertchai5Qudeer Hussain6Panuwat Joyklad7Muhammad Ashraf Javid8Department of Civil and Environmental Engineering, Faculty of Engineering, Srinakharinwirot University, Nakhonnayok 26120, ThailandThammasat Research Unit in Infrastructure Inspection and Monitoring, Repair and Strengthening (IIMRS), Faculty of Engineering, Thammasat School of Engineering, Thammasat University Rangsit, Klong Luang, Pathumthani 12000, ThailandDepartment of Civil Engineering, University of Management and Technology, Lahore 54770, PakistanStructural Engineering, Asian Institute of Technology (AIT), School of Engineering and Technology (SET), Pathumthani 12120, ThailandDepartment of Civil Engineering, Universiti Kebangsaan Malaysia (UKM), Bangi 43600, MalaysiaConstruction Innovations and Future Infrastructure Research Center (CIFIR), Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, ThailandCenter of Excellence in Earthquake Engineering and Vibration, Department of Civil Engineering, Chulalongkorn University, Bangkok 10330, ThailandDepartment of Civil and Environmental Engineering, Faculty of Engineering, Srinakharinwirot University, Nakhonnayok 26120, ThailandDepartment of Civil Engineering, NFC Institute of Engineering and Fertiliser Research, Faisalabad 38090, PakistanIntrinsically, lightweight aggregate concrete (LWAC) suffers from the low compressive strength and deformation capacity. This restricts the use of LWAC mainly to non-structural applications. Several studies have highlighted the potential of synthetic fiber-reinforced polymer (FRP) jackets for improving the substandard properties of the LWAC. However, the high costs associated with FRP jackets are generally a concern. This study identifies hemp fiber-reinforced rope polymer (FRRP) wraps as a potential alternative to the synthetic FRP jackets. The salient features of hemp FRRP include its low cost and easy availability. Therefore, the main question that needs to be answered is: can hemp FRRP strengthen LWAC as a low-cost alternative to synthetic FRP jackets? To quantitatively explain the effects of lightweight aggregates on concrete compressive strength, 24 concrete cylinders were tested in three groups. Group 1, 2, and 3 cylinders comprised 0, 50, and 100% of lightweight aggregates as natural aggregate replacements. The peak stress of the concrete was reduced by 34% and 49% in the presence of 50% and 100% lightweight aggregates, respectively. It was concluded that a single layer of hemp FRRP on Group 2 cylinders (i.e., 50% aggregate replacement) was sufficient to enhance the peak stress to the same level as that of the control cylinder in Group 1 (i.e., fabricated using natural aggregates only). At the same time, it took two layers of external FRRP on Group 3 cylinders to achieve the same strength. A positive correlation between the peak stress of the LWAC and the number of hemp FRRP layers was observed. Nonetheless, Group 1 and 3 cylinders formed the upper and lower bounds in terms of peak stress for the same level of confinement. Further to the interest, three layers of hemp FRRP shifted brittle compressive stress–strain response to a bi-linear response for all amounts of lightweight aggregates. Several existing analytical peak stress models were assessed in predicting the experimental results. From the results, it was inferred that none of these models predicted the compressive strength of all three groups of cylinders consistently.https://www.mdpi.com/2075-5309/12/9/1357hemp fiber ropefiber-reinforced polymer compositeslightweight aggregate concreteaxial compressionstrength models |
| spellingShingle | Suniti Suparp Krisada Chaiyasarn Nazam Ali Chaitanya Krishna Gadagamma Ahmed W. Al Zand Ekkachai Yooprasertchai Qudeer Hussain Panuwat Joyklad Muhammad Ashraf Javid Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical Study Buildings hemp fiber rope fiber-reinforced polymer composites lightweight aggregate concrete axial compression strength models |
| title | Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical Study |
| title_full | Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical Study |
| title_fullStr | Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical Study |
| title_full_unstemmed | Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical Study |
| title_short | Hemp FRRP Confined Lightweight Aggregate Concrete (LWAC) Circular Columns: Experimental and Analytical Study |
| title_sort | hemp frrp confined lightweight aggregate concrete lwac circular columns experimental and analytical study |
| topic | hemp fiber rope fiber-reinforced polymer composites lightweight aggregate concrete axial compression strength models |
| url | https://www.mdpi.com/2075-5309/12/9/1357 |
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