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Visual inspection of fire-damaged concrete based on terrestrial laser scanner data

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Abstract

Visual condition survey and inspection is typically the initial method employed in the assessment of concrete damaged by fire, and it is among the most significant non-destructive testing methods. In spite of visual inspection being simple in principle, it is capable of providing cardinal information about the condition of the fire-damaged structure and act as a basis upon which subsequent and detailed assessment methods can be founded. When concrete is exposed to various elevated temperatures, it undergoes change in its physical characteristics among others, and indicators such as change in surface texture, cracks, spalling and colour change become evident. These indicators of fire-damaged concrete can be assessed using visual inspection methods and further assessed with more advanced methods in a case where detailed investigations are needed. In this study, visual inspection of terrestrial laser scanner data of fire-damaged concrete was investigated by modelling and analysing laser intensity. An analysis of the generated intensity images from laser intensity data has proved useful and valuable in the visual inspection of concrete before and after heating. Furthermore, laser scanner geometric data has been used in the assessment of concrete surface roughness before and after heating.

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Acknowledgements

The authors express their gratitude to the University of Nottingham Ningbo China for the research facilities which made this study to be undertaken. This work is partially supported by “GIS-BIM application in green built environment” innovation team under grant Ningbo Science and Technology Bureau (2015B11011) and also supported by the Ningbo Science and Technology Bureau as part of the Project “Structural Health Monitoring of Infrastructure in the Logistics Cycle” (2014A35008). Many thanks also to the FIG Foundation for the scholarship of the PhD student.

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Authors and Affiliations

  1. Department of Civil Engineering, The University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo, 315100, China

    Wallace Mukupa, Craig Hancock, Huib de Ligt & Zhicong Chen

  2. Nottingham Geospatial Institute, The University of Nottingham, Nottingham, NG7 2TU, UK

    Gethin Roberts

  3. Faculty of Engineering, Middle East University, Amman, Jordan

    Khalil Al-Manasir

Authors
  1. Wallace Mukupa
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  2. Craig Hancock
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  3. Gethin Roberts
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  4. Khalil Al-Manasir
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  5. Huib de Ligt
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  6. Zhicong Chen
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Correspondence to Wallace Mukupa.

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Mukupa, W., Hancock, C., Roberts, G. et al. Visual inspection of fire-damaged concrete based on terrestrial laser scanner data. Appl Geomat 9, 143–158 (2017). https://doi.org/10.1007/s12518-017-0188-9

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  • DOI: https://doi.org/10.1007/s12518-017-0188-9

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