Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired Joints
Ultra-high performance concrete (UHPC) is an appropriate material to repair and rehabilitate aged structures due to its excellent properties, such as high compressive strength and durability. Several studies have demonstrated the effectiveness of applying UHPC in old buildings as a rehabilitation or...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-02-01
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| Series: | Buildings |
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| Online Access: | https://www.mdpi.com/2075-5309/13/3/643 |
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| author | Vinicius Brother dos Santos Ana Paula Pereira dos Santos Silva Bernardo Lopes Poncetti Lucas Dezotti Tolentino Pablo Augusto Krahl Romel Dias Vanderlei |
| author_facet | Vinicius Brother dos Santos Ana Paula Pereira dos Santos Silva Bernardo Lopes Poncetti Lucas Dezotti Tolentino Pablo Augusto Krahl Romel Dias Vanderlei |
| author_sort | Vinicius Brother dos Santos |
| collection | DOAJ |
| description | Ultra-high performance concrete (UHPC) is an appropriate material to repair and rehabilitate aged structures due to its excellent properties, such as high compressive strength and durability. Several studies have demonstrated the effectiveness of applying UHPC in old buildings as a rehabilitation or repair material, but the bond between concretes needs more investigation. In this sense, the bond between normal-strength concrete (NSC) and UHPC is currently being studied. Three main parameters are responsible for ensuring a good bond: the surface treatment of the substrate (roughness), the wetting conditions, and the mechanical strength of the substrate. Thus, the present study investigated the bond between concretes experimentally. The concrete of the substrate was carried out in three grades: C25, C45, and C60. The repair concretes were C25, C45, C60, and UHPC. The following parameters were evaluated: wetting conditions, air surface dry (ASD), saturated surface dry (SSD), substrate strength, and repair concrete strength. All models received surface treatment by wire brushing. Slant shear and splitting tensile tests were performed to evaluate the mechanical behavior and the failure modes of the bond between concretes. The bond strength was classified and compared to existing predicting models. The results showed that most expressive strength gains occurred in SSD models with lower strength substrates and UHPC. Furthermore, the influence of surface wetting conditions becomes smaller as the strength of the substrate is reduced. |
| first_indexed | 2024-03-11T06:50:31Z |
| format | Article |
| id | doaj.art-50d24b2486614577b96e4357ee5efecd |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-03-11T06:50:31Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-50d24b2486614577b96e4357ee5efecd2023-11-17T10:02:06ZengMDPI AGBuildings2075-53092023-02-0113364310.3390/buildings13030643Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired JointsVinicius Brother dos Santos0Ana Paula Pereira dos Santos Silva1Bernardo Lopes Poncetti2Lucas Dezotti Tolentino3Pablo Augusto Krahl4Romel Dias Vanderlei5Department of Civil Engineering, State University of Maringá, Av. Colombo nº 5790, Maringá 87020-900, PR, BrazilDepartment of Civil Engineering, State University of Maringá, Av. Colombo nº 5790, Maringá 87020-900, PR, BrazilDepartment of Civil Engineering, State University of Maringá, Av. Colombo nº 5790, Maringá 87020-900, PR, BrazilDepartment of Civil Engineering, State University of Maringá, Av. Colombo nº 5790, Maringá 87020-900, PR, BrazilDepartment of Civil Engineering, State University of Maringá, Av. Colombo nº 5790, Maringá 87020-900, PR, BrazilDepartment of Civil Engineering, State University of Maringá, Av. Colombo nº 5790, Maringá 87020-900, PR, BrazilUltra-high performance concrete (UHPC) is an appropriate material to repair and rehabilitate aged structures due to its excellent properties, such as high compressive strength and durability. Several studies have demonstrated the effectiveness of applying UHPC in old buildings as a rehabilitation or repair material, but the bond between concretes needs more investigation. In this sense, the bond between normal-strength concrete (NSC) and UHPC is currently being studied. Three main parameters are responsible for ensuring a good bond: the surface treatment of the substrate (roughness), the wetting conditions, and the mechanical strength of the substrate. Thus, the present study investigated the bond between concretes experimentally. The concrete of the substrate was carried out in three grades: C25, C45, and C60. The repair concretes were C25, C45, C60, and UHPC. The following parameters were evaluated: wetting conditions, air surface dry (ASD), saturated surface dry (SSD), substrate strength, and repair concrete strength. All models received surface treatment by wire brushing. Slant shear and splitting tensile tests were performed to evaluate the mechanical behavior and the failure modes of the bond between concretes. The bond strength was classified and compared to existing predicting models. The results showed that most expressive strength gains occurred in SSD models with lower strength substrates and UHPC. Furthermore, the influence of surface wetting conditions becomes smaller as the strength of the substrate is reduced.https://www.mdpi.com/2075-5309/13/3/643ultra-high performance concrete (UHPC)high-strength concrete (HSC)normal strength concrete (NSC)slant shear testsplitting tensile testbond strength |
| spellingShingle | Vinicius Brother dos Santos Ana Paula Pereira dos Santos Silva Bernardo Lopes Poncetti Lucas Dezotti Tolentino Pablo Augusto Krahl Romel Dias Vanderlei Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired Joints Buildings ultra-high performance concrete (UHPC) high-strength concrete (HSC) normal strength concrete (NSC) slant shear test splitting tensile test bond strength |
| title | Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired Joints |
| title_full | Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired Joints |
| title_fullStr | Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired Joints |
| title_full_unstemmed | Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired Joints |
| title_short | Influence of Wetting Conditions and Concrete Strength of Both Substrate and Repair Material on the Bond Capacity of Repaired Joints |
| title_sort | influence of wetting conditions and concrete strength of both substrate and repair material on the bond capacity of repaired joints |
| topic | ultra-high performance concrete (UHPC) high-strength concrete (HSC) normal strength concrete (NSC) slant shear test splitting tensile test bond strength |
| url | https://www.mdpi.com/2075-5309/13/3/643 |
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