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Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars

R. Borinaga-Treviño, A. Orbe Orcid Logo, Jose Norambuena-Contreras Orcid Logo, J. Canales

Construction and Building Materials, Volume: 186, Pages: 31 - 41

Swansea University Author: Jose Norambuena-Contreras Orcid Logo

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DOI (Published version): 10.1016/j.conbuildmat.2018.07.108

Abstract

Nowadays, refurbishing of existing structures has gained interest in order to reduce both the construction materials used and the construction and demolition waste production. For that purpose, there are several methods for demolishing the damaged parts, but most of the alternatives involve high noi...

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Published in: Construction and Building Materials
ISSN: 0950-0618
Published: Elsevier BV 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa66802
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For that purpose, there are several methods for demolishing the damaged parts, but most of the alternatives involve high noise and dust production, which are in contraposition when structures are in urban areas. Among all the existing methods, this paper studies the possibility of using microwave heating as a demolition method, either by damaging the bulk material or the mortar to concrete interface. With that in mind, the effect of microwave heating time (range 120–600 s) on the physical, thermal, electrical, mechanical and bonding properties of steel fibre-reinforced and non-reinforced cement mortars was analysed. The aim of the paper is to establish possible correlations between the mentioned properties and the damage level caused by microwave heating. Although the results prove that pore pressure increment due to microwave heating can cause the reduction of flexural strength up to the rupture of the specimens, this fact cannot be extended to all the properties or mortar types. The fibre reinforcement plays a key role to restrain the damage. Thermal conductivity and electrical resistivity are obviously different in reinforced and non-reinforced mortars due to the inclusions of the metallic fibres. However, after undergoing microwave heating those properties were not noticeably altered nor follow a trend linked to the heating time. It is assumed that the water migration and evaporation processes are the main cause. Although the flexural strength reduction was gradual for non-reinforced mortars until total failure, the reinforced specimens only showed a 13% of reduction for the first 120 s, remaining almost constant afterwards. 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spelling v2 66802 2024-06-20 Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars 73c6854ebb10465fbf7faab297135641 0000-0001-8327-2236 Jose Norambuena-Contreras Jose Norambuena-Contreras true false 2024-06-20 ACEM Nowadays, refurbishing of existing structures has gained interest in order to reduce both the construction materials used and the construction and demolition waste production. For that purpose, there are several methods for demolishing the damaged parts, but most of the alternatives involve high noise and dust production, which are in contraposition when structures are in urban areas. Among all the existing methods, this paper studies the possibility of using microwave heating as a demolition method, either by damaging the bulk material or the mortar to concrete interface. With that in mind, the effect of microwave heating time (range 120–600 s) on the physical, thermal, electrical, mechanical and bonding properties of steel fibre-reinforced and non-reinforced cement mortars was analysed. The aim of the paper is to establish possible correlations between the mentioned properties and the damage level caused by microwave heating. Although the results prove that pore pressure increment due to microwave heating can cause the reduction of flexural strength up to the rupture of the specimens, this fact cannot be extended to all the properties or mortar types. The fibre reinforcement plays a key role to restrain the damage. Thermal conductivity and electrical resistivity are obviously different in reinforced and non-reinforced mortars due to the inclusions of the metallic fibres. However, after undergoing microwave heating those properties were not noticeably altered nor follow a trend linked to the heating time. It is assumed that the water migration and evaporation processes are the main cause. Although the flexural strength reduction was gradual for non-reinforced mortars until total failure, the reinforced specimens only showed a 13% of reduction for the first 120 s, remaining almost constant afterwards. Although it was proved that the fibres increase the temperature on the specimen surface and its adhesion to the matrix is altered, their crack bridging effect overcomes further damage. Journal Article Construction and Building Materials 186 31 41 Elsevier BV 0950-0618 Cement-based mortars; Microwave heating; Thermal conductivity; Electrical resistivity; Mechanical damage; Fibre influence 20 10 2018 2018-10-20 10.1016/j.conbuildmat.2018.07.108 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2024-07-26T13:54:19.4077958 2024-06-20T12:35:47.5011309 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering R. Borinaga-Treviño 1 A. Orbe 0000-0002-7568-0456 2 Jose Norambuena-Contreras 0000-0001-8327-2236 3 J. Canales 4 66802__31001__b2c47a2ae40e465cbbd4132c0f8f4422.pdf 66802.VoR.pdf 2024-07-26T13:53:03.9353460 Output 2950603 application/pdf Version of Record true Copyright: 2018 The Authors. This is an open access article under the CC BY-NC-ND license. true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars
spellingShingle Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars
Jose Norambuena-Contreras
title_short Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars
title_full Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars
title_fullStr Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars
title_full_unstemmed Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars
title_sort Effect of microwave heating damage on the electrical, thermal and mechanical properties of fibre-reinforced cement mortars
author_id_str_mv 73c6854ebb10465fbf7faab297135641
author_id_fullname_str_mv 73c6854ebb10465fbf7faab297135641_***_Jose Norambuena-Contreras
author Jose Norambuena-Contreras
author2 R. Borinaga-Treviño
A. Orbe
Jose Norambuena-Contreras
J. Canales
format Journal article
container_title Construction and Building Materials
container_volume 186
container_start_page 31
publishDate 2018
institution Swansea University
issn 0950-0618
doi_str_mv 10.1016/j.conbuildmat.2018.07.108
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
document_store_str 1
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description Nowadays, refurbishing of existing structures has gained interest in order to reduce both the construction materials used and the construction and demolition waste production. For that purpose, there are several methods for demolishing the damaged parts, but most of the alternatives involve high noise and dust production, which are in contraposition when structures are in urban areas. Among all the existing methods, this paper studies the possibility of using microwave heating as a demolition method, either by damaging the bulk material or the mortar to concrete interface. With that in mind, the effect of microwave heating time (range 120–600 s) on the physical, thermal, electrical, mechanical and bonding properties of steel fibre-reinforced and non-reinforced cement mortars was analysed. The aim of the paper is to establish possible correlations between the mentioned properties and the damage level caused by microwave heating. Although the results prove that pore pressure increment due to microwave heating can cause the reduction of flexural strength up to the rupture of the specimens, this fact cannot be extended to all the properties or mortar types. The fibre reinforcement plays a key role to restrain the damage. Thermal conductivity and electrical resistivity are obviously different in reinforced and non-reinforced mortars due to the inclusions of the metallic fibres. However, after undergoing microwave heating those properties were not noticeably altered nor follow a trend linked to the heating time. It is assumed that the water migration and evaporation processes are the main cause. Although the flexural strength reduction was gradual for non-reinforced mortars until total failure, the reinforced specimens only showed a 13% of reduction for the first 120 s, remaining almost constant afterwards. Although it was proved that the fibres increase the temperature on the specimen surface and its adhesion to the matrix is altered, their crack bridging effect overcomes further damage.
published_date 2018-10-20T13:54:18Z
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