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Application of microwave and induction heating on fibre-reinforced cementitious materials for the demolition of structures

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Application of microwave and induction heating on fibre-reinforced cementitious materials for the demolition of structures

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dc.contributor.author Treviño, Roque es_ES
dc.contributor.author Orbe, Aimar es_ES
dc.contributor.author Cuadrado, Jesus es_ES
dc.contributor.author Crespo, I. es_ES
dc.contributor.author Norambuena-Contreras, Jose es_ES
dc.date.accessioned 2019-11-11T12:39:01Z
dc.date.available 2019-11-11T12:39:01Z
dc.date.issued 2019-10-15
dc.identifier.isbn 9788490487198
dc.identifier.uri http://hdl.handle.net/10251/130657
dc.description.abstract [EN] Nowadays, strengthening and refurbishing of existing structures on urban areas has gained interest in order to reduce costs by avoiding both the use of construction raw materials and the disposal of construction and demolition waste on landfill. Usually, existing structures need to be locally demolished in order to replace either the existing corroded reinforcement or strengthen the existing structure. Among all the existing demolition methods, microwave and induction heating have been proven as a good alternative to generate a local damage with little noise and dust production, which is a desirable feature when structures are in urban areas. However, there is a lack of information about the behaviour of both damaging methods when steel fibre-reinforced concretes are involved. This paper studies the influence of the steel fibre addition on the damaging capacity of both microwave and induction heating demolition methods. For that purpose, mortars containing two different steel fibres (steel fibres used for concrete reinforcement and brass covered steel needles used for mortar reinforcement) were added in three different proportions (0%, 0.5% and 1% by unit volume of mortar) and exposed to up to 10 min of either microwave heating (0.003-0.03 W/mm3, 2.45 GHz) or induction heating (0.016-0.023 W/mm3, 18 kHz). With the aim of evaluating the damage caused by the heating methods, test specimens were visually checked, and mechanical properties were determined via flexural and compressive strength tests. According to the results, mortars exposed to either microwave or induction heating suffered a sudden, violent disintegration without noticing any previous damage on the mortar specimens. Results proved that pressure increment on water-saturated pores caused the failure no matter the fibre type used as a reinforcement. However, for microwave heating, the reflection of microwaves on the fibres tended to concentrate the heating effect on the specimen surface, resulting in higher surface temperatures, but lower damaging potential of the demolition method. Furthermore, similar failure mechanism was observed on oven-dried mortars exposed to microwave heating. Nevertheless, oven dried mortars exposed to induction heating suffered a highly variable, silent and controlled damage, presenting a highly varying quantity of fracture planes that decreased its flexural and compressive strengths by up to 38% and 31%, respectively. es_ES
dc.description.sponsorship This work has been partly financed within the European Horizon 2020 Joint Technology Initiative Shift2Rail through contract no.730841 (IN2TRACK) and no. 826255 (IN2TRACK2). This work was also co-financed with the projects Elkartek 2018 ref. KK2018/00073 (GOLIAT) and Elkartek 2019 ref. KK-2019/00023 (GOLIAT2). The authors also wish to thank the Basque Government for financial assistance through IT919-16.
dc.format.extent 10 es_ES
dc.language Inglés es_ES
dc.publisher Editorial Universitat Politècnica de València es_ES
dc.relation.ispartof AMPERE 2019. 17th International Conference on Microwave and High Frequency Heating es_ES
dc.rights Reconocimiento - No comercial - Sin obra derivada (by-nc-nd) es_ES
dc.subject Energy Production by Microwaves es_ES
dc.subject Microwave CVD es_ES
dc.subject EM Modelling es_ES
dc.subject Microwave Material interaction es_ES
dc.subject Dielectric Properties es_ES
dc.subject Dielectric Properties Measurement es_ES
dc.subject Solid State Microwave es_ES
dc.subject Microwave Processing es_ES
dc.subject Microwave Chemistry es_ES
dc.subject Microwave applicators design es_ES
dc.title Application of microwave and induction heating on fibre-reinforced cementitious materials for the demolition of structures es_ES
dc.type Capítulo de libro es_ES
dc.type Comunicación en congreso es_ES
dc.identifier.doi 10.4995/AMPERE2019.2019.9776
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/730841/EU/Research into enhanced tracks, switches and structures/
dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/826255/EU/Research into enhanced track and switch and crossing system 2/
dc.rights.accessRights Abierto es_ES
dc.description.bibliographicCitation Treviño, R.; Orbe, A.; Cuadrado, J.; Crespo, I.; Norambuena-Contreras, J. (2019). Application of microwave and induction heating on fibre-reinforced cementitious materials for the demolition of structures. En AMPERE 2019. 17th International Conference on Microwave and High Frequency Heating. Editorial Universitat Politècnica de València. 88-97. https://doi.org/10.4995/AMPERE2019.2019.9776 es_ES
dc.description.accrualMethod OCS es_ES
dc.relation.conferencename Ampere 2019 es_ES
dc.relation.conferencedate Septiembre 09-12,2019 es_ES
dc.relation.conferenceplace Valencia, Spain es_ES
dc.relation.publisherversion http://ocs.editorial.upv.es/index.php/AMPERE2019/AMPERE2019/paper/view/9776 es_ES
dc.description.upvformatpinicio 88 es_ES
dc.description.upvformatpfin 97 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.relation.pasarela OCS\9776 es_ES


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