Publication

ARCHE D06 - Recommendations for the tailoring of UHPFRC recipes for rehabilitation

Emmanuel Denarié
2009
Reports

Résumé

The extremely low permeability of Ultra High Performance Fibre Reinforced Concretes (UHPFRC) associated to their outstanding mechanical properties make them especially suitable to locally "harden" reinforced concrete structures in critical zones subjected to an aggressive environment and to significant mechanical stresses. UHPFRC provide a unique and robust solution to simplify the construction process, dramatically reduce the duration of sites, and save money with long term durability. Rehabilitations, especially with cast on site UHPFRC are among the most demanding applications for those materials and require a significant strain hardening response under tension. Achievement of tensile strain hardening, extremely low permeability and self-compacting character is indeed a challenge that few current UHPFRC recipes can satisfy. Cement-superplasticisers compatibility issues severely restrict the range of possibilities to develop new UHPFRC recipes based on locally available components with the required properties for cast in situ applications. An original concept of Ultra High Performance matrix has been developed that makes the application of UHPFRC technology feasible with a wide range of cements and superplasticisers, with outstanding mechanical and protective performance, without significant loss of workability. This concept is an extension to UHPFRC materials of the concepts of cements blended with Limestone fillers, already applied successfully to a wide range of normal or high performance concretes. In a further step, the rheology of those mixes has been adapted to enable them to support challenging 5 % slopes of the substrates at fresh state. The development of this new technology and its portability in various countries opens very promising perspectives for the dissemination of this concept not only for rehabilitation but also for various applications of UHPFRC, prefabricated or cast-in-situ. This document presents both a general methodology for the tailoring of UHPFRC recipes (fibrous mix and matrix) and its application to Slovene and Polish components.

Source officielle

https://infoscience.epfl.ch/entities/publication/3e907ec9-b687-461f-ad80-e0a27222096e

Emmanuel Denarié
2009
Reports

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/3e907ec9-b687-461f-ad80-e0a27222096e

Concepts associés (31)

Stress–strain curve

In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength. Generally speaking, curves representing the relationship between stress and strain in any form of deformation can be regarded as stress–strain curves.

Béton

thumb|Aspect hétérogène de la surface d'un béton de ciment, appelé communément béton, et constitué de ciment, d'eau et de granulats fins (sable) et grossiers (graviers). Le béton est un assemblage de matériaux de nature généralement minérale. Il met en présence des matières inertes, appelées granulats ou agrégats (graviers, gravillons, sables), et un liant (ciment, bitume, argile), c'est-à-dire une matière susceptible d'en agglomérer d'autres ainsi que des adjuvants qui modifient les propriétés physiques et chimiques du mélange.

Yield (engineering)

In materials science and engineering, the yield point is the point on a stress-strain curve that indicates the limit of elastic behavior and the beginning of plastic behavior. Below the yield point, a material will deform elastically and will return to its original shape when the applied stress is removed. Once the yield point is passed, some fraction of the deformation will be permanent and non-reversible and is known as plastic deformation.

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