Evaluating residual compressive strength of post-fire concrete using Raman Spectroscopy

Kerr, Tanya J.; Vetter, Marleen; Gonzalez-Rodriguez, Jose

doi:10.1016/j.forsciint.2021.110874

Cited by 5 publications

(10 citation statements)

References 12 publications

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“…Moreover, the absence of the band at 998 cm -1 [13], [38], [41], [42] indicates the decomposition of ettringite [1], [6], [9], [11]- [13], [43] in all samples. At this temperature, there were small shifts of the CSH bands among the three spectra, which, as predicted in the literature [13], [15], also suggests variation in CSH decomposition.…”

Section: Raman Spectroscopysupporting

confidence: 87%

“…Raman spectroscopy was used on samples obtained from the fracture surfaces of specimens exposed to fire in the same firing -at least three concrete samples from each control group were used. This characterization technique contributes to the identification of cement hydration products and aggregate phase changes making it possible to estimate the temperature reached by the concrete [11], [13]- [15], [36]- [42]. The same methodology was used for choosing samples for analysis by Raman spectroscopy and SEM.…”

Section: Verification Of Chemical Compounds In Concretementioning

confidence: 99%

“…In the literature, some works emphasize the understanding of the structure of CSH, and its corresponding Raman shifts [13], [15], [38]- [41], from the relationship with the structure of tobermorite and jenite [13], [39], [41]. In it, the bands observed in the 800 to 1080 cm -1 are attributed to symmetric elongations of the Si-O tetrahedron.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…The temperature rise in fire situations generates temperature gradients, moisture variations, and crystalline transformations that induce structural and dimensional changes in the micro and macrostructure of concrete [7], [8]. Microstructural changes can be traced through characterization techniques such as the molecular analysis by Raman spectroscopy, used in this study to follow the different changes in the chemical compounds of concretes after exposure to high temperature [13]- [15], at the same firing step in the oven, especially of the CSH. Morphological studies of the microstructure of post-fire concrete by scanning electron microscopy (SEM), have also been efficiently used to analyze concrete degradation [6], [10]- [12].…”

Section: Introductionmentioning

confidence: 99%

“…In order to do so, the results of ultrasonic tests will be compared with the results of mechanical tests of axial compressive strength, correlating them with the results of molecular analysis by Raman spectroscopy [13]- [15] and also with those of microstructural morphological studies by scanning electron microscope (SEM) [6], [11], [12]. All involving concretes of two strength classes (variation of the water/cement ratio) submitted to three testing temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of exposure temperature variability on concrete degradation as a function of compressive strength and ultrasonic wave propagation velocity

Santos

Nunes

Martins

et al. 2024

Rev. IBRACON Estrut. Mater.

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This study evaluated the influence of heating temperature variability on the degradation level of concrete by varying the exposure temperatures (200°C, 450°C, and 800°C) and concrete design strength (C25 and C40). The concretes were submitted to ultrasound tests (before and after heating) and then were ruptured by axial compression. After rupture, samples were taken from the fracture section of the specimens for microstructural analysis by scanning electron microscope (SEM), and molecular analysis by Raman spectroscopy. The results showed that the residual strength of the concrete can change significantly (values differing by more than 100%) with temperature variability in the oven. There were physicochemical changes in the concrete constituents. The variations in Raman spectra and morphological changes (SEM images) allowed to analyze the variation in the level of degradation of concrete after exposure to fire, at the same firing step, due to temperature variation in the ovens, being compatible with the results of compressive strength and ultrasonic wave propagation velocity (UPV). Thus, the study highlights the need for adequate mapping of the heat in the oven and monitoring of the temperature of specimens in studies of concrete at high temperatures.

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Section: Raman Spectroscopysupporting

confidence: 87%

Section: Verification Of Chemical Compounds In Concretementioning

confidence: 99%

Section: Raman Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of exposure temperature variability on concrete degradation as a function of compressive strength and ultrasonic wave propagation velocity

Santos

Nunes

Martins

et al. 2024

Rev. IBRACON Estrut. Mater.

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State‐of‐the‐art review on the post‐fire assessment of concrete structures

Jovanović

Caspeele

Lombaert

et al. 2023

Structural Concrete

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Fires are rare events, but in the case of their occurrence, they can have a significant effect on the structure. Concrete is a durable noncombustible material but can be damaged by fire. This damage does not often lead to structural collapse, but can significantly hinder the structure's future performance. A thorough post‐fire assessment of concrete structures is essential to determine the condition of the structure and select the best course of action to take. This paper reviews the current state of knowledge on the post‐fire assessment of concrete structures. The techniques that are commonly used are presented and discussed, highlighting their advantages and disadvantages. Furthermore, based on the literature case studies, an overview of different approaches and techniques is presented. Finally, the framework and goals of the post‐fire assessment are investigated. The paper concludes with a summary of the current state of knowledge and a list of key research needs.

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Experimental investigation of the strength of fire-damaged concrete depending on admixture contents

Chun

Kwon

Kim

et al. 2023

Construction and Building Materials

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Evaluating residual compressive strength of post-fire concrete using Raman Spectroscopy

Cited by 5 publications

References 12 publications

Influence of exposure temperature variability on concrete degradation as a function of compressive strength and ultrasonic wave propagation velocity

Influence of exposure temperature variability on concrete degradation as a function of compressive strength and ultrasonic wave propagation velocity

State‐of‐the‐art review on the post‐fire assessment of concrete structures

Experimental investigation of the strength of fire-damaged concrete depending on admixture contents

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