New NDT techniques for the assessment of fire-damaged concrete structures

Colombo, M.; Felicetti, Roberto

doi:10.1016/j.firesaf.2006.09.002

Cited by 109 publications

(89 citation statements)

References 12 publications

(12 reference statements)

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“…This discolouration is related to the characteristic chemical and physical changes of the cement paste and the aggregates [8]. The extent of this colour change is strongly dependant on the iron content of the concrete [21].…”

Section: 4macroscopic Observationsmentioning

confidence: 99%

“…Colour change at the concrete surface and within cross-sections adds helpful information relating to the maximum temperature to which the material was exposed, as most discolouration is associated with oxidation and decarbonation reactions that take place in both the aggregates and the cement mortar [5][6][7][8]. The main characteristics explored in this work are moisture loss from the decomposition of the calcium silicate hydrate (C-S-H), the transformation of the portlandite (Ca(OH)2), the oxidation of iron hydroxides (Fe(OH)2) and the decarbonation of calcium carbonates (CaCO3) [9].…”

Section: Introductionmentioning

confidence: 99%

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A thermoanalytical, X-ray diffraction and petrographic approach to the forensic assessment of fire affected concrete in the United Arab Emirates

Alqassim

Jones

Berlouis

et al. 2016

Forensic Science International

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A thermoanalytical, X-ray diffraction and petrographic approach to the forensic assessment of fire affected concrete in the United Arab Emirates Alqassim, M. A.; Jones, Martyn; Berlouis, L. E. A.; Nic Daeid, Niamh General rightsCopyright and moral rights for the publications made accessible in Discovery Research Portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from Discovery Research Portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain.• You may freely distribute the URL identifying the publication in the public portal. Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. KeywordsForensic investigation; Concrete; Fire; Thermal Analysis; X-ray Diffraction; Colour Change. Highlights• This work studies the application of thermogravimetric analysis, differential scanning calorimetry, X-ray diffraction and petrography as tools for revealing the thermal history on concrete structures.• • Other reactions can be reversible, particularly the dehydroxylation of Portlandite.The thermal history can still be determined though by comparing the onset temperature of reformed components with Portlandite in non-previously heated samples.

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Section: 4macroscopic Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A thermoanalytical, X-ray diffraction and petrographic approach to the forensic assessment of fire affected concrete in the United Arab Emirates

Alqassim

Jones

Berlouis

et al. 2016

Forensic Science International

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“…UPV appears to be a qualitative (rather than quantitative) technique for determination of fire-damage in structures affected by fire (Cioni et al 2001, Yang et al, 2009. A modified UPV test proposed by Colombo and Felicetti (2007) proved to be more effective to assess buildings affected by fire. Lee et al (2004) used UPV to assess the early properties of high-performance concrete (HPC), which usually have a low water-to-cementitious materials (w/cm) ratio and also employ various chemical and mineral admixtures.…”

Section: Special Applications Of Upv In Cementitious Compositesmentioning

confidence: 99%

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Panzera¹,

Christofóro²,

Cota³

et al. 2011

Advances in Composite Materials - Analysis of Natural and Man-Made Materials

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“…Specifically, the physical-thermal transformations that the components of the concrete go through serve to characterize it after it has been subject to the fire [12,18,19].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the behaviour of the structural concrete after the fire at the Windsor Building in Madrid

Menéndez

Vega

2009

Fire and Materials

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SUMMARYThe analysis of the concrete subjected to high temperatures is usually undertaken by means of tests specifically designed and carried out in the laboratory, or by using theoretical approaches using standardized curves for theoretical fires.An analysis by different techniques has been carried out on structural concrete to real fire of Windsor Building in Madrid, which was severally damaged by a fire in 2005. These techniques are X-ray diffraction, differential thermal and thermogravimetric analysis and backscattered electron microscopy with dispersive X-ray microanalysis. Samples of the concrete were taken from different floors in the building and analyses were carried out at different depths starting from the surface exposed to the fire itself. The analysis allows the damaged area to be limited as well as situating the 500 • C isotherm in the concrete element.In accordance with the results obtained, the damage is limited to just a few centimeters from the surface exposed to the fire itself, in spite of its prolonged exposure to the fire. This would justify that the concrete has demonstrated a suitable resistant behaviour. Likewise, it can be deduced from the results obtained that the fire, to which the concrete was subjected, can be qualified as severe.Also, these results can confirm that the calculation hypothesis in the project is correct in relation to the fire resistance exigencies of the concrete.

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New NDT techniques for the assessment of fire-damaged concrete structures

Cited by 109 publications

References 12 publications

A thermoanalytical, X-ray diffraction and petrographic approach to the forensic assessment of fire affected concrete in the United Arab Emirates

A thermoanalytical, X-ray diffraction and petrographic approach to the forensic assessment of fire affected concrete in the United Arab Emirates

Ultrasonic Pulse Velocity Evaluation of Cementitious Materials

Analysis of the behaviour of the structural concrete after the fire at the Windsor Building in Madrid

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