The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete
Abstract Low-strength concrete (LSC) elements are prone to several seismic and static loads and are one of the priorities to be considered for FRP strengthening. However, certain provisions should be taken into account according to provisions, as elements with considerably low compressive strength a...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-03-01
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| Series: | International Journal of Concrete Structures and Materials |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s40069-022-00502-2 |
| _version_ | 1818354714282033152 |
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| author | Nima Hashemi Sina Hassanpour Asghar Vatani Oskoei |
| author_facet | Nima Hashemi Sina Hassanpour Asghar Vatani Oskoei |
| author_sort | Nima Hashemi |
| collection | DOAJ |
| description | Abstract Low-strength concrete (LSC) elements are prone to several seismic and static loads and are one of the priorities to be considered for FRP strengthening. However, certain provisions should be taken into account according to provisions, as elements with considerably low compressive strength are not eligible for FRP confinement. This experimental study investigates (1) the effect of rebar planting on increasing the initial compressive strength of LSC to achieve allowable compressive strength for FRP strengthening, and (2) the effect of CFRP confinement on increasing the strength of rebar-embedded specimens and determining the most effective factor for strength improvement. For this purpose, 38 standard concrete cylinders were tested under compressive load. The variables of this study were rebar length and diameter, the compressive strength of concrete, and the number of CFRP sheets. Two initial compressive strengths below the designated compressive strength of 17 MPa (12.5 and 14.5 MPa) were selected. After determining rebar-reinforced specimens with compressive strength of more than 17 MPa, CFRP confinement and compressive tests of these cylinders were utilized. A statistical single-factor ANOVA analysis is performed to determine the most effective variable for ultimate strength and strain, individually. In the end, available models in the literature were utilized to predict experimental data. The results indicated the effectiveness of rebar planting for strength enhancement up to 53%, also showing that specimens with initial compressive strength of 14.77 MPa were suitable for CFRP confinement after rebar planting. The experimental and statistical ANOVA results demonstrated the CFRP confinement and its interaction with rebar embedment as the most effective factors with respect to increasing the load-bearing capacity of LSC concrete. |
| first_indexed | 2024-12-13T19:29:49Z |
| format | Article |
| id | doaj.art-8581f5616592499382516a7ff372ea1c |
| institution | Directory Open Access Journal |
| issn | 1976-0485 2234-1315 |
| language | English |
| last_indexed | 2024-12-13T19:29:49Z |
| publishDate | 2022-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Concrete Structures and Materials |
| spelling | doaj.art-8581f5616592499382516a7ff372ea1c2022-12-21T23:33:57ZengSpringerOpenInternational Journal of Concrete Structures and Materials1976-04852234-13152022-03-0116111610.1186/s40069-022-00502-2The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength ConcreteNima Hashemi0Sina Hassanpour1Asghar Vatani Oskoei2Department of Civil and Environmental Engineering, Shahid Rajaee Teacher Training UniversityDepartment of Civil and Environmental Engineering, Sharif University of TechnologyDepartment of Civil and Environmental Engineering, Shahid Rajaee Teacher Training UniversityAbstract Low-strength concrete (LSC) elements are prone to several seismic and static loads and are one of the priorities to be considered for FRP strengthening. However, certain provisions should be taken into account according to provisions, as elements with considerably low compressive strength are not eligible for FRP confinement. This experimental study investigates (1) the effect of rebar planting on increasing the initial compressive strength of LSC to achieve allowable compressive strength for FRP strengthening, and (2) the effect of CFRP confinement on increasing the strength of rebar-embedded specimens and determining the most effective factor for strength improvement. For this purpose, 38 standard concrete cylinders were tested under compressive load. The variables of this study were rebar length and diameter, the compressive strength of concrete, and the number of CFRP sheets. Two initial compressive strengths below the designated compressive strength of 17 MPa (12.5 and 14.5 MPa) were selected. After determining rebar-reinforced specimens with compressive strength of more than 17 MPa, CFRP confinement and compressive tests of these cylinders were utilized. A statistical single-factor ANOVA analysis is performed to determine the most effective variable for ultimate strength and strain, individually. In the end, available models in the literature were utilized to predict experimental data. The results indicated the effectiveness of rebar planting for strength enhancement up to 53%, also showing that specimens with initial compressive strength of 14.77 MPa were suitable for CFRP confinement after rebar planting. The experimental and statistical ANOVA results demonstrated the CFRP confinement and its interaction with rebar embedment as the most effective factors with respect to increasing the load-bearing capacity of LSC concrete.https://doi.org/10.1186/s40069-022-00502-2low-strength concrete (LSC)confinementCFRP fibersrebar installationANOVA analysis |
| spellingShingle | Nima Hashemi Sina Hassanpour Asghar Vatani Oskoei The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete International Journal of Concrete Structures and Materials low-strength concrete (LSC) confinement CFRP fibers rebar installation ANOVA analysis |
| title | The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete |
| title_full | The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete |
| title_fullStr | The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete |
| title_full_unstemmed | The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete |
| title_short | The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete |
| title_sort | effect of rebar embedment and cfrp confinement on the compressive strength of low strength concrete |
| topic | low-strength concrete (LSC) confinement CFRP fibers rebar installation ANOVA analysis |
| url | https://doi.org/10.1186/s40069-022-00502-2 |
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