Physical characteristics of sandstone types extracted from Bohemian historic quarries

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Physical characteristics of sandstone types extracted from Bohemian historic quarries

Popis výsledku v původním jazyce

This paper presents the results of detailed physical testing of seven typical sandstone types historically used in buildings across the Bohemian region. These include Božanov (arkose sandstone), Žehrovice (arkose), Droba (wacke sandstone, unknown quarry), Hořice (quartz sandstone), Libná (quartz sandstone with glauconite), Nehvizdy (quartz sandstone), and Petřín (quartz sandstone), identified by their quarry names. Test specimens were prepared from damaged sandstone blocks removed from the masonry railing of the Charles Bridge in Prague prior to their replacement. Having been exposed to prolonged weathering on the bridge, the stones provided both sound and degraded material for evaluation. Mechanical properties were assessed using standard specimens as well as non-standard thin plates designed to capture the effects of the rock’s heterogeneous structure and its deteriorated surface layers. Deflection data from three-point flexural tests were used to determine the static modulus of elasticity and compare it with the dynamic modulus. The static modulus was calculated with respect to the sandstone’s non-linear load response, and differences between tangential and secant moduli were analysed. The laboratory investigations also included measurements of thermal and hydric expansion coefficients, water absorption, and porosity. These results were compared with those obtained from non-destructive or considerately destructive tests, namely near-surface cohesion assessed by micro-drilling resistance and ultrasonic propagation velocity. The study contributes to established methods for examining historic materials during the preparatory phase of restoring damaged sandstone structures and offers reference data for material assessment, practical applications, and numerical modelling.

Název v anglickém jazyce

Physical characteristics of sandstone types extracted from Bohemian historic quarries

Popis výsledku anglicky

This paper presents the results of detailed physical testing of seven typical sandstone types historically used in buildings across the Bohemian region. These include Božanov (arkose sandstone), Žehrovice (arkose), Droba (wacke sandstone, unknown quarry), Hořice (quartz sandstone), Libná (quartz sandstone with glauconite), Nehvizdy (quartz sandstone), and Petřín (quartz sandstone), identified by their quarry names. Test specimens were prepared from damaged sandstone blocks removed from the masonry railing of the Charles Bridge in Prague prior to their replacement. Having been exposed to prolonged weathering on the bridge, the stones provided both sound and degraded material for evaluation. Mechanical properties were assessed using standard specimens as well as non-standard thin plates designed to capture the effects of the rock’s heterogeneous structure and its deteriorated surface layers. Deflection data from three-point flexural tests were used to determine the static modulus of elasticity and compare it with the dynamic modulus. The static modulus was calculated with respect to the sandstone’s non-linear load response, and differences between tangential and secant moduli were analysed. The laboratory investigations also included measurements of thermal and hydric expansion coefficients, water absorption, and porosity. These results were compared with those obtained from non-destructive or considerately destructive tests, namely near-surface cohesion assessed by micro-drilling resistance and ultrasonic propagation velocity. The study contributes to established methods for examining historic materials during the preparatory phase of restoring damaged sandstone structures and offers reference data for material assessment, practical applications, and numerical modelling.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Stone 2025. Proceedings of the 15th International congress on the deterioration and conservation of stone

ISBN

978-2-930054-47-6

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

103-109

Název nakladatele

CY Cergy Paris Université/Royal Institute of Cultural Heritage (KIK-IRPA)

Místo vydání

Paris

Místo konání akce

Paris

Datum konání akce

8. 9. 2025

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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