Dario Redaelli

HES-SO University of Applied Sciences and Arts Western Switzerland · School of Engineering & Architecture Fribourg

The use of conventional reinforced concrete for building partition walls has proven several benefits in terms of acoustic performance and robustness. Horizontal reinforcement is typically governing in their design, and arranged to control cracking due to shrinkage and imposed deformations. In view of reducing material consumption and CO2eq, an alte...

In the context of an experimental programme on the use of macrosynthetic fibre reinforced concrete (MSFRC) for casting building partition walls, three walls from a residential building in Switzerland were selected for an onsite application (with lengths varying between 2.8 and 13 m). The walls had an amount of fibres equal to 4 kg/m3 and only conve...

Questa nota presenta i risultati di una ricerca volta a valutare e confrontare le proprietà di due calcestruzzi fibrorinforzati ad altissime prestazioni (UHPRFC) commerciali realizzati con la stessa quantità di fibre di acciaio (2.5% vol.). Oltre ad una caratterizzazione di base delle proprietà meccaniche, come la resistenza alla compressione e il...

Conventional reinforced concrete for building partition walls has proven numerous advantages (in terms for instance of acoustic performance and robustness) with respect to other existing alternatives. However, its use leads to high material consumption and environmental footprint together with time‐consuming processes for placing steel reinforcemen...

A promising strategy to reduce the environmental impact of the construction industry is the reuse of structural elements resulting from the deconstruction of existing buildings. However, despite a growing interest from the academic and industrial communities, practical examples of the reuse of structural elements remain very scarce at present, espe...

Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC) is characterized by high compressive strength, strain-hardening behaviour in tension and very low porosity. After cracking, crack opening is controlled by the fibres. Therefore, UHPFRC is generally considered as a very durable material and is frequently used in combination with reinforcement...

With the aim to reduce the environmental footprint of buildings, this paper presents an original structural system concept for two-way slabs in residential and office buildings. The proposed system extends the best practice in terms of modularity, versatility, demountability, reusability, and durability. A finite set of elements can be used to form...

Current load-bearing systems for buildings rarely have a beneficial end of life. Modular design is a proven solution for revalorizing obsolete structures, but it hardly competes with conventional solutions: the range of future spatial configurations that the modules will accommodate is usually too limited to balance additional upfront costs due to...

This paper presents the preliminary results of an experimental investigation aimed at studying the corrosion behaviour of reinforcement in ultra-high performance fibre reinforced concretes. Regarding parameters related with corrosion initiation, tests of capillary absorption, water content and water absorption, electrical resistivity, accelerated c...

The paper (in French) present the results of an experimental study carried out to evaluate : - the evolution in time of bond between UHPC and existing concrete in the very first hours after casting of UHPC on concrete ; - the effect of vibrations and cyclic sollicitations applied at very early age (between 0 and 48 hours after casting of UHPC) on b...

A known challenge of modular structural systems is to avoid the oversizing of its elements while allowing a wide variety of spatial layouts. Considering any given floor outline and the availability of square slab elements with three discrete bending and shear stiffness, this paper explores: 1) the minimal geometric and topological rules that ensure...

This paper presents the results of a numerical study carried out by the authors to better understand the structural behavior of prestressed beams with a complex geometry and to identify numerical modelling techniques that allow to adequately predict such behavior. Ultra-High Performance Fibre Reinfored Concrete (UHPC) beams with and without opening...

Brick masonry is one of the most competitive technologies for the construction of walls in residential buildings. However, the structural response of masonry walls under seismic action has major drawbacks: a relatively low resistance to horizontal forces and a limited ductility. Several strengthening techniques already exist for masonry walls, such...

High-strength concrete (HSC) is commonly used for columns that need to withstand significant compressive forces and bending moments. However, the brittleness that characterized HSC behavior negatively affects the ultimate strength and ductility of columns. Thanks to fibers, high-strength fiber-reinforced concrete (HSFRC) and ultra-highperformance f...

Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC) is a material characterised by significantly improved mechanical and durability properties compared to other concretes. In recent years, an important research effort has been made to identify appropriate structural forms and to provide practical design rules allowing efficient UHPFRC structu...

The present research improves the experimental and theoretical knowledge on the behaviour of structural elements made of ultra high performance fibre reinforced concrete (UHPFRC) with ordinary reinforcement. UHPFRC is a recently developed material with much higher mechanical properties and durability than ordinary concrete. However, it has been use...

Bending behaviour of members without ordinary reinforcement made of quasi-brittle materials (such as concrete or fibre-reinforced concrete) is subjected to size effect both in terms of strength and ductility. For a typical ultra-high performance fibre-reinforced concrete (UHPFRC), size effect on bending strength is less significant. In this paper,...

Ultra-high performance fiber reinforced concrete (UHPFC) is a new class of materials that combine a very strong and dense cementicious matrix with a high fiber content. UHPFC has a very high compressive strength (in the order of 200 MPa) and a relatively large tensile strength (in the order of 10 MPa), along with a strain hardening behavior in tens...

Ultra-high performance fibre reinforced concrete (UHPFC) is a high performance construction material, coupling strength, ductility and compacity. Up to the present time, its mechanical properties have been widely studied, but design approaches and structural applications in which it can be efficiently applied are needed. To improve this knowledge,...