Local Natural Substitutes for Weathered Historical Building Stones in Flanders

Nijs, R.; Geyter, Gert De

doi:10.1016/b978-0-7506-0237-2.50116-7

Cited by 2 publications

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“…In relation to limestones, salt weathering has been characterised by Zezza and Macrì (1995) as having a selective character, influenced by features such as mineral grains and fossils. Nijs and Degeyter (1991) in a study of a sandy limestone reported that contacts between coarse grains (such as calcite fossils) and fine cement constituted favourable places for salt crystallisation. López refer that the textural anisotropy of stones could imply variable behaviour under salt crystallisation tests.…”

Section: Macroscopic Testsmentioning

confidence: 98%

Limestones under salt decay tests: assessment of pore network-dependent durability predictors

Alves

Figueiredo²,

Maurício³

et al. 2011

Environ Earth Sci

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Three Portuguese limestones (two grainstones, Semi-rijo and Moca Creme commercial types, and a travertine) were subjected to salt crystallisation test (EN 12370:1999). Grainstones specimens showed higher weight loss than the travertine ones. Results are discussed, using parametric and nonparametric statistics, in relation to pore space characteristics that have been considered durability predictors, evaluated at the macroscopic (water imbibition) and microscopic (mercury injection porosimetry) levels. Several of the pore-space parameters indicate differences between grainstones and travertine, but these differences are much lower than the differences in weight loss. Results of the durability dimensional estimator (DDE) seem to present a discrepancy, with higher values in the rock type having lower weight loss (travertine). Additionally, weathering patterns of travertine samples show marked irregularities (a feature that is not assessed by weight loss). These irregularities are attributed to heterogeneous spatial distribution of detritic components (a feature that is not assessed by pore-space parameters). Comparing the grainstones, Moca Creme showed higher values of mass loss and several durability predictors suggested noteworthy differences in relation to Semi-rijo. However, these differences are much lower than differences in weight loss. Calculated crystallisation pressures are even higher for Semi-rijo. It is proposed that petrographical aspects of Moca Creme, namely heterogeneity related to the presence of bioclasts and veinlets, could contribute to explain the higher weathering susceptibility of this rock type. These results highlight the need to include petrographical features in assessments of durability and the usefulness of visual description on the characterization of salt weathering.

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Section: Macroscopic Testsmentioning

confidence: 98%

Limestones under salt decay tests: assessment of pore network-dependent durability predictors

Alves

Figueiredo²,

Maurício³

et al. 2011

Environ Earth Sci

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Susceptibility of Limestone Petrographic Features to Salt Weathering: A Scanning Electron Microscopy Study

et al. 2013

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Salt weathering is a major erosive process affecting porous materials in buildings. There have been attempts to relate erosive mass loss to physical characteristics of materials, but in the case of natural stone it is necessary to consider the effect of petrographic features that are a source of heterogeneity. In this paper, we use scanning electron microscopy before and after salt weathering tests in cubic specimens of three limestone types (two grainstones and a travertine) in an attempt to built conceptual models that relate petrographic features and salt weathering susceptibility (represented by mass loss). In the grainstones, the most relevant feature in controlling salt weathering processes is the interface between micrite aggregates and sparry cement that constitute weakness surfaces and barriers to fluid migration. Given the small size of the heterogeneities in relation to the test sample dimension and their spatial distribution, the macroscopic erosive patterns are globally homogeneously distributed, affecting edges and corners. In the travertine specimens, there are macroheterogeneities related to the presence of detritic-rich portions that cause heterogeneous erosive patterns in the specimens. Petrological modeling helps to understand results of salt weathering tests, supporting field studies for natural stone selection.

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Local Natural Substitutes for Weathered Historical Building Stones in Flanders

Cited by 2 publications

References 0 publications

Limestones under salt decay tests: assessment of pore network-dependent durability predictors

Limestones under salt decay tests: assessment of pore network-dependent durability predictors

Susceptibility of Limestone Petrographic Features to Salt Weathering: A Scanning Electron Microscopy Study

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