Publication

UHPFRC Technology to enhance the performance of existing concrete bridges

Eugen Brühwiler
2018
Conference Papers

Résumé

"UHPFRC" stands for Ultra-High Performance Fibre Reinforced Cementitious Composite materials. UHPFRC - complemented with steel reinforcing bars - serves as an external reinforcement increasing the ultimate flexural and shear resistances as well as the fatigue resistance and stiffness of the RC members, thus strengthening for higher live loads. UHPFRC is waterproof and crack-free under service conditions and thus improves the durability. The concept of the UHPFRC Technology consists in adding a thin layer of UHPFRC to an existing member in reinforced concrete (RC) in order to enhance its structural resistance and durability. The UHPFRC Technology is applied in Switzerland for more than 10 years. Basic principles are presented and the characteristics of the UHPFRC Technology are highlighted by two applications to enhance the performance of two large existing highway bridges.

Source officielle

https://infoscience.epfl.ch/entities/publication/d60e10ea-0ccd-4af8-92a1-fd1c9d0d7d99

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Eugen Brühwiler
2018
Conference Papers

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/d60e10ea-0ccd-4af8-92a1-fd1c9d0d7d99

À propos de ce résultat

Concepts associés (14)

Béton armé

vignette|Armatures métalliques de renforcement du béton. vignette|« Cancer du béton » : lorsque le front de carbonatation atteint l'armature métallique, celle-ci est atteinte de rouille qui fait augmenter le volume de l'acier, conduisant à l'éclatement du béton d'enrobage, ce qui provoque des délaminations, ou comme ici des épaufrures qui mettent à nu les armatures oxydées. Le béton armé est un matériau composite constitué de béton et de barres d'acier alliant les propriétés mécaniques complémentaires de ces matériaux (bonne résistance à la compression du béton et bonne résistance à la traction de l'acier).

Structural steel

Structural steel is a category of steel used for making construction materials in a variety of shapes. Many structural steel shapes take the form of an elongated beam having a of a specific cross section. Structural steel shapes, sizes, chemical composition, mechanical properties such as strengths, storage practices, etc., are regulated by standards in most industrialized countries. Most structural steel shapes, such as -beams, have high second moments of area, which means they are very stiff in respect to their cross-sectional area and thus can support a high load without excessive sagging.

Prestressed concrete

Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" (compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to the concrete and is done to improve the performance of the concrete in service. Tendons may consist of single wires, multi-wire strands or threaded bars that are most commonly made from high-tensile steels, carbon fiber or aramid fiber.

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