Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testing
The interfaces that develop when fresh concrete is poured onto existing substrates are noted for their vulnerability and influence on the durability and integrity of the composite structure. Studies on the shear bond properties and failure mechanisms of such composite concrete-to-concrete joints und...
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| Language: | English |
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Elsevier
2024-12-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123024012556 |
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| author | Mohamad Ezzedine El Dandachy Dalia AlMohamad Matthieu Briffaut Abdulkader El-Mir Joseph J. Assaad Hilal El-Hassan |
| author_facet | Mohamad Ezzedine El Dandachy Dalia AlMohamad Matthieu Briffaut Abdulkader El-Mir Joseph J. Assaad Hilal El-Hassan |
| author_sort | Mohamad Ezzedine El Dandachy |
| collection | DOAJ |
| description | The interfaces that develop when fresh concrete is poured onto existing substrates are noted for their vulnerability and influence on the durability and integrity of the composite structure. Studies on the shear bond properties and failure mechanisms of such composite concrete-to-concrete joints under normal stress are essential for developing predictive and numerical models that accommodate various levels of joint substrate roughness. This study aims to use an innovative 3D shearing box, BCR3D, to analyze the shear behavior of concrete-to-concrete joints under direct shear tests at a constant normal stress. The influence of the degree of surface roughness on the pure shear behavior of these joints was assessed at a normal stress level of 1 MPa. The substrate post-hardening surface morphology was evaluated using a high-resolution laser profilometer. Statistical surface roughness parameters were computed using MATLAB. A parametric study was carried out involving bond strength, residual shear stress, contractive-dilative behaviors, and total fracture energy. Results showed that bond strength, dilative normal displacement, and total fracture energy were proportional to the substrate surface roughness. Residual shear stress was not affected by the initial surface roughness. Dilative normal displacements were more significant for specimens with higher surface substrate roughness due to interlocking, with values reaching up to 1.77 mm. Joints with high substrate surface roughness exhibited similar bond strength and fracture energy to those obtained from the monolithic specimens, underscoring the significance of substrate preparation before casting new concrete layers. |
| format | Article |
| id | doaj-art-887d3ff058604beabda7a45ef02bb772 |
| institution | OA Journals |
| issn | 2590-1230 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-887d3ff058604beabda7a45ef02bb7722025-08-20T01:58:31ZengElsevierResults in Engineering2590-12302024-12-012410300010.1016/j.rineng.2024.103000Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testingMohamad Ezzedine El Dandachy0Dalia AlMohamad1Matthieu Briffaut2Abdulkader El-Mir3Joseph J. Assaad4Hilal El-Hassan5Beirut Arab University, Department of Civil and Environmental Engineering, Beirut, LebanonSocotec Infrastructure, 5 Pl. des Frères Montgolfier, 78280, Guyancourt, FranceCNRS, Centrale Lille, UMR9013—LaMcube—Laboratoire de mécanique multiphysique et multiéchelle, Université de Lille, 59000, Lille, FranceUniversity of Balamand, Department of Civil and Environmental Engineering, PO Box 100, Al Kourah, Lebanon; United Arab Emirates University, Department of Civil and Environmental Engineering, Al Ain, United Arab Emirates, PO Box 15551University of Balamand, Department of Civil and Environmental Engineering, PO Box 100, Al Kourah, LebanonUnited Arab Emirates University, Department of Civil and Environmental Engineering, Al Ain, United Arab Emirates, PO Box 15551; Corresponding author.The interfaces that develop when fresh concrete is poured onto existing substrates are noted for their vulnerability and influence on the durability and integrity of the composite structure. Studies on the shear bond properties and failure mechanisms of such composite concrete-to-concrete joints under normal stress are essential for developing predictive and numerical models that accommodate various levels of joint substrate roughness. This study aims to use an innovative 3D shearing box, BCR3D, to analyze the shear behavior of concrete-to-concrete joints under direct shear tests at a constant normal stress. The influence of the degree of surface roughness on the pure shear behavior of these joints was assessed at a normal stress level of 1 MPa. The substrate post-hardening surface morphology was evaluated using a high-resolution laser profilometer. Statistical surface roughness parameters were computed using MATLAB. A parametric study was carried out involving bond strength, residual shear stress, contractive-dilative behaviors, and total fracture energy. Results showed that bond strength, dilative normal displacement, and total fracture energy were proportional to the substrate surface roughness. Residual shear stress was not affected by the initial surface roughness. Dilative normal displacements were more significant for specimens with higher surface substrate roughness due to interlocking, with values reaching up to 1.77 mm. Joints with high substrate surface roughness exhibited similar bond strength and fracture energy to those obtained from the monolithic specimens, underscoring the significance of substrate preparation before casting new concrete layers.http://www.sciencedirect.com/science/article/pii/S2590123024012556ConcreteBondDirect shearRoughnessJointFailure |
| spellingShingle | Mohamad Ezzedine El Dandachy Dalia AlMohamad Matthieu Briffaut Abdulkader El-Mir Joseph J. Assaad Hilal El-Hassan Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testing Results in Engineering Concrete Bond Direct shear Roughness Joint Failure |
| title | Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testing |
| title_full | Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testing |
| title_fullStr | Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testing |
| title_full_unstemmed | Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testing |
| title_short | Assessment of concrete-to-concrete shear bond behavior using 3-D direct shear testing |
| title_sort | assessment of concrete to concrete shear bond behavior using 3 d direct shear testing |
| topic | Concrete Bond Direct shear Roughness Joint Failure |
| url | http://www.sciencedirect.com/science/article/pii/S2590123024012556 |
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