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Experimental Behavior of Post-installed Lap Splices: From Bond Strength to Structural Performance
https://orcid.org/http://orcid.org/0000-0003-1226-1841
https://orcid.org/http://orcid.org/0000-0002-2337-1571
https://orcid.org/http://orcid.org/0000-0001-8453-6619
https://orcid.org/http://orcid.org/0000-0003-1812-2148
The utilization of post-installed (PI) rebars (reinforcing bars) is widely established in a construction industry that continuously strives for innovation in the strengthening and retrofitting of concrete structures. High-performance mortars offer more bond strength to PI rebars than what is typically available for cast-in (CI) rebars. Still, if splitting governs failure, this advantage cannot be exploited due to poor confinement and low tensile strength of the concrete surrounding the spliced CI rebars. This paper investigates the splitting and bond strength of PI lap splices with high-performance injection mortars. The experimental campaign covers pull-out tests on single bars, direct tensile tests on lap splices, and structural tests on slab connections subjected to bending. Three injection mortars with distinct components and resulting bond strengths are evaluated on a local level. On a structural level, bending tests on slabs with one mortar are compared against slabs with continuous reinforcement and CI lap splices. Fiber optic sensors capture the strains along the rebars, providing insights into mortar stiffness, bond stress distribution, and splitting forces around the spliced reinforcement. Digital image correlation and displacement transducers track crack formation and rebar displacement during testing. Other influential parameters like the concrete cover, transverse reinforcement, and compressive strength of the concrete were fixed to standard and minimum values according to Eurocode 2. Results demonstrate enhanced bond strength and splitting resistance in PI lap splices when the high-stiffness mortar is employed. Deformations and crack widths are analyzed at the serviceability and ultimate limit states to prove load transfer between spliced rebars.
Experimental Behavior of Post-installed Lap Splices: From Bond Strength to Structural Performance
https://orcid.org/http://orcid.org/0000-0003-1226-1841
https://orcid.org/http://orcid.org/0000-0002-2337-1571
https://orcid.org/http://orcid.org/0000-0001-8453-6619
https://orcid.org/http://orcid.org/0000-0003-1812-2148
The utilization of post-installed (PI) rebars (reinforcing bars) is widely established in a construction industry that continuously strives for innovation in the strengthening and retrofitting of concrete structures. High-performance mortars offer more bond strength to PI rebars than what is typically available for cast-in (CI) rebars. Still, if splitting governs failure, this advantage cannot be exploited due to poor confinement and low tensile strength of the concrete surrounding the spliced CI rebars. This paper investigates the splitting and bond strength of PI lap splices with high-performance injection mortars. The experimental campaign covers pull-out tests on single bars, direct tensile tests on lap splices, and structural tests on slab connections subjected to bending. Three injection mortars with distinct components and resulting bond strengths are evaluated on a local level. On a structural level, bending tests on slabs with one mortar are compared against slabs with continuous reinforcement and CI lap splices. Fiber optic sensors capture the strains along the rebars, providing insights into mortar stiffness, bond stress distribution, and splitting forces around the spliced reinforcement. Digital image correlation and displacement transducers track crack formation and rebar displacement during testing. Other influential parameters like the concrete cover, transverse reinforcement, and compressive strength of the concrete were fixed to standard and minimum values according to Eurocode 2. Results demonstrate enhanced bond strength and splitting resistance in PI lap splices when the high-stiffness mortar is employed. Deformations and crack widths are analyzed at the serviceability and ultimate limit states to prove load transfer between spliced rebars.
Experimental Behavior of Post-installed Lap Splices: From Bond Strength to Structural Performance
https://orcid.org/http://orcid.org/0000-0003-1226-1841
https://orcid.org/http://orcid.org/0000-0002-2337-1571
https://orcid.org/http://orcid.org/0000-0001-8453-6619
https://orcid.org/http://orcid.org/0000-0003-1812-2148
The utilization of post-installed (PI) rebars (reinforcing bars) is widely established in a construction industry that continuously strives for innovation in the strengthening and retrofitting of concrete structures. High-performance mortars offer more bond strength to PI rebars than what is typically available for cast-in (CI) rebars. Still, if splitting governs failure, this advantage cannot be exploited due to poor confinement and low tensile strength of the concrete surrounding the spliced CI rebars. This paper investigates the splitting and bond strength of PI lap splices with high-performance injection mortars. The experimental campaign covers pull-out tests on single bars, direct tensile tests on lap splices, and structural tests on slab connections subjected to bending. Three injection mortars with distinct components and resulting bond strengths are evaluated on a local level. On a structural level, bending tests on slabs with one mortar are compared against slabs with continuous reinforcement and CI lap splices. Fiber optic sensors capture the strains along the rebars, providing insights into mortar stiffness, bond stress distribution, and splitting forces around the spliced reinforcement. Digital image correlation and displacement transducers track crack formation and rebar displacement during testing. Other influential parameters like the concrete cover, transverse reinforcement, and compressive strength of the concrete were fixed to standard and minimum values according to Eurocode 2. Results demonstrate enhanced bond strength and splitting resistance in PI lap splices when the high-stiffness mortar is employed. Deformations and crack widths are analyzed at the serviceability and ultimate limit states to prove load transfer between spliced rebars.
Experimental Behavior of Post-installed Lap Splices: From Bond Strength to Structural Performance
Lecture Notes in Civil Engineering
Barros, Joaquim A. O. (editor) / Cunha, Vítor M. C. F. (editor) / Sousa, Hélder S. (editor) / Matos, José C. (editor) / Sena-Cruz, José M. (editor) / Croppi, Jose I. (author) / Ahrens, Mark Alexander (author) / Palmeri, Alessandro (author) / Piccinin, Roberto (author) / Mark, Peter (author)
FIB International Conference on Concrete Sustainability ; 2024 ; Guimarães, Portugal
4th fib International Conference on Concrete Sustainability (ICCS2024) ; Chapter: 55 ; 446-454
2025-01-09
9 pages
Article/Chapter (Book)
Electronic Resource
English
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