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Ground-Penetrating Radar monitoring of concrete at high temperature

Lo Monte, F; Lombardi, F; Felicetti, R; Lualdi, M; (2017) Ground-Penetrating Radar monitoring of concrete at high temperature. Construction and Building Materials , 151 (C) pp. 881-888. 10.1016/j.conbuildmat.2017.06.114. Green open access

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Abstract

Water front in concrete exposed to rapid heating is the layer where water vaporization and the subsequent pore pressure rise take place. Pore pressure is one of the main triggering factors in heat-induced explosive spalling (relevant for structures, such as tunnels, exposed to fire), while moisture migration influences concrete radiation shielding capability (important in containment shells of nuclear power plants and radioactive waste repositories). Hence, the experimental monitoring of water front in concrete at high temperature is a very interesting – though challenging – task. In a recent experimental campaign carried out at Politecnico di Milano, promising results have been obtained by coupling pore pressure-temperature measurements and water front monitoring through Ground-Penetrating Radar. This technique was implemented in a fire test performed on a concrete slab heated at the bottom face and proved to be effective in detecting the position of the water front during heating. The combination with pressure measurement allowed to confirm that pressure peaks are achieved in correspondence of the water front.

Type: Article
Title: Ground-Penetrating Radar monitoring of concrete at high temperature
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.conbuildmat.2017.06.114
Publisher version: http://dx.doi.org/10.1016/j.conbuildmat.2017.06.11...
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Concrete, Drying, Fire, Ground-Penetrating Radar, High temperature, Pore pressure, Spalling, Vaporization, Water
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1574310
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