scholarly journals Preface: RILEM technical committee 258-AAA–Development of a performance-based testing concept

2022 ◽  
Vol 55 (1) ◽  
Author(s):  
Børge Johannes Wigum ◽  
Jan Lindgård
Keyword(s):  
Technical Committee ◽  
Rilem Technical Committee ◽  
A Performance

scholarly journals Reveal of Internal, Early-Load Interfacial Debonding on Cement Textile-Reinforced Sandwich Insulated Panels

2021 ◽  
Vol 11 (2) ◽  
pp. 879
Author(s):  
Eleni Tsangouri ◽  
Hasan Ismail ◽  
Matthias De Munck ◽  
Dimitrios G. Aggelis ◽  
Tine Tysmans
Keyword(s):  
Average Frequency ◽  
Technical Committee ◽  
Interfacial Debonding ◽  
Image Correlation ◽  
Rilem Technical Committee ◽  
Structural Element ◽  
Full Field ◽  
Displacement Mapping ◽  
Early Loading ◽  
Damage Tracking

Internal interfacial debonding (IID) phenomena on sandwich façade insulated panels are detected and tracked by acoustic emission (AE). The panels are made of a thin and lightweight cementitious composite skin. In the lab, the panels are tested under incremental bending simulating service loads (i.e., wind). Local (up to 150 mm wide) skin-core detachments are reported in the early loading stage (at 5% of ultimate load) and are extensively investigated in this study, since IID can detrimentally affect the long-term durability of the structural element. A sudden rise in the AE hits rate and a shift in the wave features (i.e., absolute energy, amplitude, rise time) trends indicate the debonding onset. AE source localization, validated by digital image correlation (DIC) principal strains and out-of-plane full-field displacement mapping, proves that early debonding occurs instantly and leads to the onset of cracks in the cementitious skin. At higher load levels, cracking is accompanied by local debonding phenomena, as proven by RA value increases and average frequency drops, a result that extends the state-of-the-art in the fracture assessment of concrete structures (Rilem Technical Committee 212-ACD). Point (LVDT) and full-field (AE/DIC) measurements highlight the need for a continuous and full-field monitoring methodology in order to pinpoint the debonded zones, with the DIC technique accurately reporting surface phenomena while AE offers in-volume damage tracking.

scholarly journals RILEM TC "Reinforcement of Timber Elements in Existing Structures"

2013 ◽  
Vol 778 ◽  
pp. 1041-1048 ◽  
Author(s):  
Thomas Tannert ◽  
Jorge M. Branco ◽  
Mariapaola Riggio
Keyword(s):  
Adhesive Layer ◽  
Technical Committee ◽  
Structural Performance ◽  
Rilem Technical Committee ◽  
Reinforced Polymers ◽  
Existing Structures ◽  
University Of Applied Sciences ◽  
Recent Developments ◽  
Strength And Stiffness ◽  
The University

The paper reports on the activities of the RILEM technical committee Reinforcement of Timber Elements in Existing Structures. The main objective of the committee is to coordinate the efforts to improve the reinforcement practice of timber structural elements. Recent developments related to structural reinforcements can be grouped into three categories: (i) addition of new structural systems to support the existing structure; (ii) configuration of a composite system; and (iii) incorporation of elements to increase strength and stiffness. The paper specifically deals with research carried out at the Bern University of Applied Sciences Switzerland (BFH), the University of Minho Portugal (UniMinho), and the University of Trento Italy (UNITN). Research at BFH was devoted to improve the structural performance of rounded dovetail joints by means of different reinforcement methods: i) self-tapping screws, ii) adhesive layer, and iii) a combination of self-tapping screws and adhesive layer. Research at UNITN targeted the use of dry connections for timber-to-timber composites, specifically reversible reinforcement techniques aimed at increasing the load-bearing capacity and the bending stiffness of existing timber floors. At UniMinho, double span continuous glulam slabs were strengthened with fibre-reinforced-polymers. All three examples demonstrate the improved structural performance of timber elements after reinforcing them.

scholarly journals Slurry surfacing: a review of definitions, descriptions and current practices

2019 ◽  
Vol 4 ◽  
pp. 103-109
Author(s):  
Andrea Grilli ◽  
Andrea Graziani ◽  
Alan Carter ◽  
Cesare Sangiorgi ◽  
Luciano Pivoto Specht ◽  
...  
Keyword(s):  
Best Practice ◽  
Technical Committee ◽  
National Standards ◽  
Rilem Technical Committee ◽  
Cold Surface ◽  
Bituminous Mixtures ◽  
Bitumen Emulsion ◽  
Local Experience ◽  
Structural Applications ◽  
Control Procedures

Cold bitumen emulsions (CBE) are currently used worldwide for both non-structural (cold surface treatments) and structural (cold bituminous mixtures) paving applications. Among non-structural applications, bituminous slurry surfacings (BSS) allow to improve surface properties and extend the pavement’s life. However, selection of constituents, mix design, application and quality control procedures for BSS are mostly based on local experience and empirical tests. Thus, the use of BSS is associated to higher technical risks with respect to the use of traditional hot-mix technologies. In this context the RILEM Technical Committee 280-CBE TG2 “Multiphase characterisation of cold bitumen emulsion materials” aims to collect worldwide theoretical knowledge and experiences on BSS and to inspire new standards, specifications and guidelines encompassing the wide set of existing practices. This paper summarizes the first part of the literature review carried out as part of the TC workplan and focuses on the definition, the description and the application method for BSS. National standards, construction specifications and best practice documents from North America, South America, Europe and Australia are analysed and compared.  

A Final Report of RILEM Technical Committee 27-EVS

1980 ◽  
Vol 13 (4) ◽  
pp. 323-331 ◽  
Author(s):  
William C. Cullen ◽  
T. Sneck
Keyword(s):  
Technical Committee ◽  
Rilem Technical Committee ◽  
Final Report

scholarly journals Behaviour of high-performance concrete at high temperatures: some highlights

2017 ◽  
Vol 2 ◽  
pp. 45-52 ◽  
Author(s):  
Pierre Pimienta ◽  
Maria Cruz Alonso ◽  
Robert Jansson McNamee ◽  
Jean-Christophe Mindeguia
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
High Performance ◽  
High Performance Concrete ◽  
State Of The Art ◽  
Technical Committee ◽  
Rilem Technical Committee ◽  
Civil Structures ◽  
Physicochemical Changes ◽  
Materials Used

High-performance concrete (HPC) is one of the most recent types of concrete among the materials used routinely in building and civil structures. Their development in structures applications and the growing need for the justification of their fire resistance has led several laboratories to carry out research on their properties at high temperature. This letter presents some main aspects related to their physicochemical changes, thermal properties and mechanical properties at high temperature. It introduces a State of The Art prepared by the RILEM Technical Committee 227-HPB (Physical properties and behaviour of High-Performance Concrete at high temperature) and untitled “Behaviour of High-Performance Concrete at high temperatures”. This State of the Art will be publish in a next future.

Numerical Modelling of the Experimental Response of SRG Systems

2019 ◽  
Vol 817 ◽  
pp. 37-43
Author(s):  
Marialaura Malena ◽  
Marialuigia Sangirardi ◽  
Francesca Roscini ◽  
Gianmarco de Felice
Keyword(s):  
Numerical Modelling ◽  
Large Scale ◽  
Numerical Models ◽  
High Strength ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Technical Committee ◽  
Structural Performance ◽  
Rilem Technical Committee ◽  
Test Procedures

Modern repairing and retrofitting methods for existing structures make use of composite materials, consisting of high strength textiles and a matrix, which can be either polymeric or inorganic. These kinds of techniques have been largely applied to masonry structures, since they significantly improve structural performance with a small increase of weight and a minimum invasiveness. However, the application of organic gluing agents on masonry has revealed some well-known drawbacks, which are almost all overcome resorting to inorganic matrixes, namely cement or lime mortars. An entire class of composites is thus identified as TRM (Textile Reinforced Mortars) or FRCM (Fibre Reinforced Cementitious Matrices). Among them, Steel Reinforced Grout (SRG) are characterized by Ultra High Tensile Strength Steel (UHTSS) cords embedded in mortar matrix and their use to improve the structural performance of existing historical masonry buildings is becoming more and more diffused. Qualification tests and acceptance criteria for SRG have just been defined. Nonetheless, numerical simulation of current available test procedures is mandatory to identify peculiar aspects of the response that at a following stage become an integral part of large scale models, when entire reinforced structures or portions need to be analysed. To this end, this work presents the numerical modelling of two different direct tensile tests on SRG systems: the Clamping-grip setup (RILEM Technical Committee 232-TDT 2016) and the Clevis-grip setup (ICC-ES AC434 2016). Numerical models able to replicate experimental tests and catch fundamental differences in their failure mechanisms are present

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