416 research outputs found
Outline, setting the scene & degradation due to inappropriate design and errors during casting
No full textProceedings of the DuRSAAM 2023 Symposium on Advancing Alkali-Activated Materials
No full textThe DuRSAAM 2023 Symposium celebrates the end of an exciting and successful EU-project, titled ‘PhD Training Network on Durable, Reliable and Sustainable Structures with Alkali-Activated Materials (DuRSAAM)’ and coordinated by Ghent University. In line with the scope of this European project, that has run from 2018 till 2023, the DuRSAAM2023 Symposium focusses on new developments in all aspects of alkali-activated concrete, sometimes also referred to as geopolymer concrete. These open access proceedings collect the short papers, as presented by the participants during the symposium, and provides researchers, building professionals and stakeholders recent insights on advancing alkali-activated materials
Introduction to durability, sustainability and life cycle assessment of concrete structures - Lecture notes of the DuRSAAM training course held September 2020
No full textThis e-book has been made in the framework of the European Training Network on Durable, Reliable and Sustainable Structures with Alkali-Activated Materials (DuRSAAM), which organized an online training course on 14 till 17 September 2020 about durability, sustainability and life cycle assessment of concrete structures. This open source book collects the lecture notes by the teachers of this training course and provides researchers, building professionals and stakeholders basic insights on the sustainability aspects of concrete structures, having eco-friendly concretes in mind as emerging building technology
Externally applied FRP reinforcement for concrete structures
No full textn December 1996, CEB established a Task Group with the main objective to elaborate design guidelines for the use of FRP reinforcement in accordance with the design format of the CEB-FIP Model Code and Eurocode2. With the merger of CEB and FIP into fib in June 1998, this Task Group became fib TG 9.3 FRP Reinforcement for concrete structures in Commission 9 Reinforcing and Prestressing Materials and Systems. Finally, as a result of the restructuring of fib’s Commissions and Task Groups at the end of 2014, the Task Group became fib T5.1 FRP Reinforcement for concrete structures, chaired by Stijn Matthys at Ghent University, in Commission 5 Reinforcements.
The work of former TG 9.3 and current T5.1 was performed by two working parties (WP), one of which is “Externally Applied Reinforcement” (EAR), which produced fib bulletin 14 “Externally bonded FRP reinforcement for RC structures” in July 2001. Following a number of years of relatively slow activity, the WP on externally applied reinforcement was reactivated and started working on an update of bulletin 14. The result of this work is summarised in the present technical report, which aims to give design guidelines on the use of externally applied FRP reinforcement (both externally bonded and near-surface mounted) for concrete structures. An attempt has been made to present some of the topics in a Eurocode-compatible format, so that the material covered may form the basis for the introduction of composites in the next version of Eurocode 2 and for the updating of the text on seismic retrofitting with composites in the next version of Eurocode 8.
All persons who participated in the preparation of this Bulletin are mentioned in the copyright page. Further acknowledgements are due to Josée Bastien (Canada), Hans Rudolf Ganz (Switzerland) and Luc Taerwe (Belgium) for revision of the document. To all members of the working party on externally applied reinforcement our sincere thanks are expressed for the high quality and extensive work brought in on a voluntary basis.
Stijn MATTHYS, Convenor of TG5.1
Thanasis TRIANTAFILLOU, Convenor of WG EAR
Theodore NEFF, Chair of Commission
The influence of service temperature on bond between FRP reinforcement and concrete
No full textThe interest in fibre reinforced polymer (FRP) reinforcement in construction has considerably increased and especially the application of FRP as externally bonded reinforcement (FRP EBR) has become more and more established. The use of FRP EBR has been adopted world-wide as a very attractive technique for
structural strengthening and rehabilitation. At Ghent university, the fire behaviour of slabs and beams strengthened with advanced composites, including the use of fire protection systems, has been investigated. In addition, the behaviour of the FRP-concrete interface at increased temperatures has been
considered, as elevated temperatures may occur during service conditions, especially for outdoor applications. According to fib Bulletin 14, the glass transition temperature of the adhesive used to bond the FRP should equal 20°C in excess of the maximum ambient temperature at normal service conditions,
and should be at least 45°C. When reaching the glass transition temperature, the properties of the adhesive decrease to a large extend and bond interaction between the concrete and the external FRP reinforcement may be completely lost.
To study the bond behaviour at elevated temperatures, a joint test program between the Universities of Ghent and Lecce has been executed, comprising a series of 20 bond tests performed at the Magnel Laboratory for Concrete Research. The present paper will discuss the experimental work and the main test results obtained
Influence of curing conditions on alkali-activated mortars intended for concrete repair
No full textRepair mortars are costly materials with high level of Portland cement and various additives which questions their eco-efficiency. In this respect, cement free material solutions such as alkali-activated mortars based on ground granulated blast furnace slag (BFS) are gaining interest for structural repair. The aim of this research is to study blast furnace slag as a precursor for producing ambient cured alkali-activated repair mortars. To achieve this purpose, a total of four mixtures were prepared using four different molar ratios of the silicate solution. The fresh and hardened properties of the produced mortars including flow retention, dry density, compressive and flexural strength are studied comparing ambient-cured and sealedcured specimens. Furthermore, the tensile bond strength between the repair mortars and a grit blasted concrete substrate was verified (after 7 days sealed + 21 days ambient curing). The results demonstrate, for the tested configurations, the feasibility of the alkali-activated repair mortar, including a good adherence. Given the limited scope of the tests, more work is needed to confirm the observations further
CFRP to concrete bond at elevated service temperatures and modelling of CFRP strengthened reinforced concrete beams subjected to fire
No full textBond behaviour and tension stiffening of flat stainless steel rebars with continuous or alternate rib pattern embedded in concrete
No full textEvaluation and optimization of the fire safety of concrete elements strengthened with NSM reinforcement
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