Evaluating Residual Compressive strength of Post-fire Concrete using Raman 3 Spectroscopy

Kerr, Tanya, Vetter, Marleen and Gonzalez-Rodriguez, Jose (2021) Evaluating Residual Compressive strength of Post-fire Concrete using Raman 3 Spectroscopy. Forensic Science International, 325 . ISSN 2665-9107

Full content URL: https://doi.org/10.1016/j.forsciint.2021.110874

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Evaluating Residual Compressive strength of Post-fire Concrete using Raman 3 Spectroscopy
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Abstract

Cement and water within the concrete mass create a hydrated phase which acts as the glue for holding the sand and coarse aggregates in place to develop a strong construction material. The most important phase within the cement matrix is that of calcium silicate hydrate (CSH), which is largely responsible for the concrete strength. Decomposition of the CSH phase due to high temperatures will affect compressive strength of the concrete. Raman bands at 1083, 709 and 276 cm-1 , which are representative of the CaCO3 and CSH presence 18 in the concrete matrix phases can be used to assess changes in compressive strength as a result of thermal decomposition. The ratio between 1083/709 cm-1 bands was calculated and correlated to 20 the compression strength of the concrete. The results show there is a rapid decline in strength around a critical peak ratio of 8.78 and a residual compressive strength of 0.62, closely following a polynomial curve. The tool developed here allows an indirect evaluation of the temperature the
concrete has been exposed to by studying the band. A case study from a fire scene taken from a warehouse in Kingston (Jamaica) is also presented
25 with the conclusion and results compared. The study showed that Raman spectroscopy has the
26 potential to provide in-situ non-destructive testing of fire damaged concrete rapidly and accurately

Keywords:elevated temperature, Calcium Silica Hydrate, compressive strength, Raman spectroscopy, Concrete, Post-fire analysis
Subjects:F Physical Sciences > F200 Materials Science
F Physical Sciences > F100 Chemistry
F Physical Sciences > F130 Structural Chemistry
F Physical Sciences > F410 Forensic Science
Divisions:College of Science > School of Chemistry
ID Code:47642
Deposited On:22 Dec 2021 15:03

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