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A platform for research: civil engineering, architecture and urbanism
The whitish variety of Ançã limestone: Evaluation of fire-induced damage using ultrasonic tomography
https://orcid.org/0000-0003-3741-7179
https://orcid.org/0000-0001-8016-4029
https://orcid.org/0000-0002-5221-1630
Abstract In this paper, 3D ultrasonic tomography was combined with petrophysics (color, gloss, open porosity, capillary absorption coefficient and bulk density) and elastic parameters (VS, VP/VS, Young’s modulus—E, shear modulus—µ, bulk modulus—K and Poisson’s ratio—ν) in order to evaluate the effect of high temperatures (300 ºC and 600 ºC) and type of cooling (partial and total immersion in tap water at room temperature) in a Portuguese limestone—the whitish variety of Ançã limestone. The study revealed that this limestone, despite its mineralogical homogeneity and petrographical character, is a heterogeneous stone with relatively high porosity and water absorption by capillarity. Heating at 300 ºC and 600 ºC led to an increase in the stone's heterogeneity (clearly revealed on ultrasound tomograms) and to a degradation of its petrophysical and mechanical properties, being this fact more accentuated in samples heated to 600 ºC and whose cooling was by total immersion. Comparison between total and partial immersion in tap water after high temperature exposure, revealed that total immersion induced high level of damage on this limestone. The high temperatures induced also aesthetical modifications, clearly visible by marked eye, namely a reduction in luminosity, chroma and specular gloss.
The whitish variety of Ançã limestone: Evaluation of fire-induced damage using ultrasonic tomography
https://orcid.org/0000-0003-3741-7179
https://orcid.org/0000-0001-8016-4029
https://orcid.org/0000-0002-5221-1630
Abstract In this paper, 3D ultrasonic tomography was combined with petrophysics (color, gloss, open porosity, capillary absorption coefficient and bulk density) and elastic parameters (VS, VP/VS, Young’s modulus—E, shear modulus—µ, bulk modulus—K and Poisson’s ratio—ν) in order to evaluate the effect of high temperatures (300 ºC and 600 ºC) and type of cooling (partial and total immersion in tap water at room temperature) in a Portuguese limestone—the whitish variety of Ançã limestone. The study revealed that this limestone, despite its mineralogical homogeneity and petrographical character, is a heterogeneous stone with relatively high porosity and water absorption by capillarity. Heating at 300 ºC and 600 ºC led to an increase in the stone's heterogeneity (clearly revealed on ultrasound tomograms) and to a degradation of its petrophysical and mechanical properties, being this fact more accentuated in samples heated to 600 ºC and whose cooling was by total immersion. Comparison between total and partial immersion in tap water after high temperature exposure, revealed that total immersion induced high level of damage on this limestone. The high temperatures induced also aesthetical modifications, clearly visible by marked eye, namely a reduction in luminosity, chroma and specular gloss.
The whitish variety of Ançã limestone: Evaluation of fire-induced damage using ultrasonic tomography
https://orcid.org/0000-0003-3741-7179
https://orcid.org/0000-0001-8016-4029
https://orcid.org/0000-0002-5221-1630
Abstract In this paper, 3D ultrasonic tomography was combined with petrophysics (color, gloss, open porosity, capillary absorption coefficient and bulk density) and elastic parameters (VS, VP/VS, Young’s modulus—E, shear modulus—µ, bulk modulus—K and Poisson’s ratio—ν) in order to evaluate the effect of high temperatures (300 ºC and 600 ºC) and type of cooling (partial and total immersion in tap water at room temperature) in a Portuguese limestone—the whitish variety of Ançã limestone. The study revealed that this limestone, despite its mineralogical homogeneity and petrographical character, is a heterogeneous stone with relatively high porosity and water absorption by capillarity. Heating at 300 ºC and 600 ºC led to an increase in the stone's heterogeneity (clearly revealed on ultrasound tomograms) and to a degradation of its petrophysical and mechanical properties, being this fact more accentuated in samples heated to 600 ºC and whose cooling was by total immersion. Comparison between total and partial immersion in tap water after high temperature exposure, revealed that total immersion induced high level of damage on this limestone. The high temperatures induced also aesthetical modifications, clearly visible by marked eye, namely a reduction in luminosity, chroma and specular gloss.
The whitish variety of Ançã limestone: Evaluation of fire-induced damage using ultrasonic tomography
Martinho, E. (author) / Dionísio, A. (author) / Amaral, M. (author) / Mendes, M. (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
Contribution to the study of Anca limestone
| British Library Conference Proceedings | 1998
Ultrasonic Methods for Damage Evaluation in Limestone Columns
| British Library Conference Proceedings | 1993
Consolidation effectiveness of TEOS on Ançã limestone from Portugal – A laboratory study.
| BASE | 2010
Monitoring Damage in Concrete Columns Using Ultrasonic Tomography
| British Library Online Contents | 2018