Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of Fiber Content on the Self-healing Capability of Ultra High-Performance Fiber-Reinforced Concrete
https://orcid.org/http://orcid.org/0000-0001-6456-4401
https://orcid.org/http://orcid.org/0000-0002-1731-0297
https://orcid.org/http://orcid.org/0000-0001-8754-1165
https://orcid.org/http://orcid.org/0000-0002-1067-1276
Ultra High-Performance Fiber Reinforced Concrete (UHPFRC) has enhanced self-healing capability thanks to its reduced water-to-cement ratio and the presence of unhydrated cement particles, as well as its crack pattern with multiple cracks. Normally, this concrete type is reinforced with high contents of fine steel fibers to confer ductility and high tensile strength.
This study examines the impact of two fiber dosages and types on the self-healing ability of a UHPFRC. The combinations compared are UHPFRC with 40 kg/m3 of 65/35 3D steel fiber and UHPFRC with 160 kg/m3 short straight-shaped steel fibers (13/0.2). Self-healing is assessed through crack closure, water permeability, and protection against chloride penetration. Disks of size Φ100 × 50 mm were pre-cracked at the age of 21 days to produce cracks between 100–450 μm. Crack width and water permeability in cracked conditions were studied before and after the healing process. At 28 days old, self-healing was promoted through two different conditions: continuous immersion in water at a temperature of 20 ℃ and exposure to a high-humidity environment at 20 ℃ with 95% relative humidity. After healing and performing the final crack width and water permeability tests, chloride permeability through healed cracks and the matrix were also evaluated to evaluate the protection against the penetration of chlorides.
Effect of Fiber Content on the Self-healing Capability of Ultra High-Performance Fiber-Reinforced Concrete
https://orcid.org/http://orcid.org/0000-0001-6456-4401
https://orcid.org/http://orcid.org/0000-0002-1731-0297
https://orcid.org/http://orcid.org/0000-0001-8754-1165
https://orcid.org/http://orcid.org/0000-0002-1067-1276
Ultra High-Performance Fiber Reinforced Concrete (UHPFRC) has enhanced self-healing capability thanks to its reduced water-to-cement ratio and the presence of unhydrated cement particles, as well as its crack pattern with multiple cracks. Normally, this concrete type is reinforced with high contents of fine steel fibers to confer ductility and high tensile strength.
This study examines the impact of two fiber dosages and types on the self-healing ability of a UHPFRC. The combinations compared are UHPFRC with 40 kg/m3 of 65/35 3D steel fiber and UHPFRC with 160 kg/m3 short straight-shaped steel fibers (13/0.2). Self-healing is assessed through crack closure, water permeability, and protection against chloride penetration. Disks of size Φ100 × 50 mm were pre-cracked at the age of 21 days to produce cracks between 100–450 μm. Crack width and water permeability in cracked conditions were studied before and after the healing process. At 28 days old, self-healing was promoted through two different conditions: continuous immersion in water at a temperature of 20 ℃ and exposure to a high-humidity environment at 20 ℃ with 95% relative humidity. After healing and performing the final crack width and water permeability tests, chloride permeability through healed cracks and the matrix were also evaluated to evaluate the protection against the penetration of chlorides.
Effect of Fiber Content on the Self-healing Capability of Ultra High-Performance Fiber-Reinforced Concrete
https://orcid.org/http://orcid.org/0000-0001-6456-4401
https://orcid.org/http://orcid.org/0000-0002-1731-0297
https://orcid.org/http://orcid.org/0000-0001-8754-1165
https://orcid.org/http://orcid.org/0000-0002-1067-1276
Ultra High-Performance Fiber Reinforced Concrete (UHPFRC) has enhanced self-healing capability thanks to its reduced water-to-cement ratio and the presence of unhydrated cement particles, as well as its crack pattern with multiple cracks. Normally, this concrete type is reinforced with high contents of fine steel fibers to confer ductility and high tensile strength.
This study examines the impact of two fiber dosages and types on the self-healing ability of a UHPFRC. The combinations compared are UHPFRC with 40 kg/m3 of 65/35 3D steel fiber and UHPFRC with 160 kg/m3 short straight-shaped steel fibers (13/0.2). Self-healing is assessed through crack closure, water permeability, and protection against chloride penetration. Disks of size Φ100 × 50 mm were pre-cracked at the age of 21 days to produce cracks between 100–450 μm. Crack width and water permeability in cracked conditions were studied before and after the healing process. At 28 days old, self-healing was promoted through two different conditions: continuous immersion in water at a temperature of 20 ℃ and exposure to a high-humidity environment at 20 ℃ with 95% relative humidity. After healing and performing the final crack width and water permeability tests, chloride permeability through healed cracks and the matrix were also evaluated to evaluate the protection against the penetration of chlorides.
Effect of Fiber Content on the Self-healing Capability of Ultra High-Performance Fiber-Reinforced Concrete
RILEM Bookseries
Mechtcherine, Viktor (Herausgeber:in) / Signorini, Cesare (Herausgeber:in) / Junger, Dominik (Herausgeber:in) / Doostkami, Hesam (Autor:in) / Formagini, Sidiclei (Autor:in) / Serna, Pedro (Autor:in) / Roig-Flores, Marta (Autor:in)
RILEM-fib International Symposium on Fibre Reinforced Concrete ; 2024 ; Dresden, Germany
Transforming Construction: Advances in Fiber Reinforced Concrete ; Kapitel: 44 ; 352-359
RILEM Bookseries ; 54
12.09.2024
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Autogenous Self-Healing Capacity of Early-Age Ultra-High-Performance Fiber-Reinforced Concrete
| DOAJ | 2021
| BASE | 2021