Project/scholarship details
- Project/scholarship ID
134348
- Reference
EXPL/ECM-EST/1323/2013
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
49,943.00 €
- Start date
2014-03-01
- End date
2015-06-30
Documents
A new methodology for assisting quality control of NSM-CFRP systems since very ...
Fernandes, Pedro Miguel Gomes; Granja, José; Sena-Cruz, José; Azenha, Miguel; Benedetti, AndreaThe performance of NSM systems directly depends on the performance of the adhesive which can only be reached if a proper curing conditions and time are assured. In order to assess the curing process of the adhesives, as well as the corresponding bond behavior, adequate non-destructive testing approaches are required. Nonetheless, scarce information could be found in the literature in concern to this relevant to...
Quality control and monitoring of NSM CFRP systems: E-modulus evolution of epox...
Fernandes, Pedro Miguel Gomes; Granja, José Luís Duarte; Benedetti, Andrea; Sena-Cruz, José; Azenha, MiguelThe present paper describes the application of an innovative technique (termed EMM-ARM: Elasticity Modulus Monitoring through Ambient Response Method) for continuous monitoring of the stiffening process of an epoxy adhesive used in near-surface mounted (NSM) fibre reinforced polymer (FRP) reinforcements. A simultaneous study of direct pull-out tests with concrete specimens strengthened with NSM carbon FRP lamin...
Continuous monitoring of concrete mechanical properties since an early age to s...
Granja, José Luís Duarte; Azenha, MiguelThe assessment of concrete mechanical properties during construction of concrete structures is of paramount importance for many intrinsic operations. However many of the available non-destructive methods for mechanical properties have limitations for use in construction sites. One of such methodologies is EMM-ARM, which is a variant of classic resonant frequency methods. This paper aims to demonstrate the effor...
Innovative method for the continuous monitoring of concrete viscoelastic proper...
Azenha, Miguel; Granja, José Luís Duarte; Oliveira, RicardoThe experimental evaluation of viscoelastic properties of concrete is traditionally made upon creep tests that consist in the application of sustained loads either in compression or in tension. This kind of testing demands for specially devised rigs and requires careful monitoring of the evolution of strains, whereas assuring proper load constancy. The characterization of creep behaviour at early ages offers ad...
EMM-ARM Retrospective and current developments
Azenha, Miguel; Granja, José Luís Duarte; Dunant, CyrilleFCT PhD grant SFRH/BD/80682/2011; FCT research project VisCoDyn EXPL/ECM-EST/1323/2013
Effects of curing temperature on pull-out behavior and stiffness evolution of e...
Benedetti, Andrea; Fernandes, Pedro Miguel Gomes; Granja, José Luís Duarte; Azenha, Miguel; Sena-Cruz, JoséThe efficiency of the FRP-concrete strengthening system is strongly influenced by the mechanical properties of the epoxy adhesive, which depend on the curing temperature.In the present work, the influence of temperature on the curing process of the epoxy was examined. Two different temperatures were studied: 20 and 30 °C. The elastic modulus of the adhesive was continuously monitored by using a variant of the c...
Monitoring the early stiffness development in epoxy adhesives for structural st...
Granja, José Luís Duarte; Fernandes, Pedro Miguel Gomes; Benedetti, Andrea; Azenha, Miguel; Sena-Cruz, JoséThe present work aimed to assess the early-age evolution of E-modulus of epoxy adhesives used for Fibre-Reinforced Polymer (FRP) strengthening applications. The study involved adapting an existing technique devised for continuous monitoring of concrete stiffness since casting, called EMM-ARM (Elasticity Modulus Monitoring through Ambient Response Method) for evaluation of epoxy stiffness. Furthermore, monotonic...
Glycerol resulting from biodiesel production as an admixture for cement-based m...
Azenha, Miguel; Lucas, Cândida; Granja, José Luís Duarte; Carlos-Alves, Inês; Guimarães, Erika TinocoConcrete admixtures are frequently expensive and may carry relevant ecological footprints, reason why there is a growing necessity and interest in finding cheaper and more sustainable alternatives. The present work focused on the evaluation of the potential benefits that might be harvested by adding a partially purified biodiesel by-product as an admixture to cement-based materials. An experimental programme wa...
Experimental validation of a framework for hygro-mechanical simulation of self-...
Azenha, Miguel; Leitão, Luís; Granja, José Luís Duarte; Sousa, Christoph Fernandes; Faria, Rui; Barros, Joaquim A. O.An accurate simulation of the internal stresses that develop in concrete structures in service demands the explicit consideration of the internal heat and moisture movements that induce strains, which in turn have the potential to cause relevant internal stresses. Following a previous exploratory work from the authors, in which a thermo-hygro-mechanical simulation framework had been proposed, the present paper ...
Viscoelastic response of an epoxy adhesive for construction since its early age...
Silva, Patrícia; Valente, Tiago; Azenha, Miguel; Sena-Cruz, José; Barros, Joaquim A. O.Epoxy adhesives have been extensively used in strengthening of reinforced concrete structures. In spite of that, research on the viscoelastic behaviour of these adhesives and its influence on the mechanical behaviour of strengthened concrete structures is scarce, particularly at the early ages of curing. The main goal of present work is to better understand the tensile creep behaviour of a specific commercial e...
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