Influência Da Textura E Da Mineralogia Na Porosidade Aparente, Absorção De Água E Densidade Aparente De Rochas Ígneas

Meyer, Ana Paula; Zanon, Marcela Lopes; Artur, Antônio Carlos; Oliveira, Nubia Ponce Leão de De

doi:10.4322/tmm.2014.046

TMM

2014

DOI: 10.4322/tmm.2014.046

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Influência Da Textura E Da Mineralogia Na Porosidade Aparente, Absorção De Água E Densidade Aparente De Rochas Ígneas

Ana Paula Meyer¹,

Marcela Lopes Zanon²,

Antônio Carlos Artur³

et al.

Abstract: a ResumoO trabalho consiste na avaliação dos resultados de índices físicos (porosidade aparente, absorção de água e densidade aparente) obtidos em diferentes amostras de rochas ígneas explotadas como rochas ornamentais e de revestimento no estado de São Paulo e Espírito Santo. Os resultados dos índices físicos foram qualificados conforme os parâmetros de especificação de uso publicado pela Abirochas e relacionados às características petrográficas observadas em cada amostra. Palavras-chave: Índices físicos; Gra… Show more

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Influence of Textural and Compositional Heterogeneities on the Staining of Silicate Ornamental Rocks

Meyer,

Mattos,

Vale

et al. 2024

RGSA

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Objective: This study aims to compare the results of staining tests carried out on natural silicate ornamental stone samples. The staining test was applied to different regions of the same slab of rock, assessing the behavior of a staining agent, oil, in relation to the textural variations and compositional characteristics of the natural rocks investigated. From this analysis, we hope to better understand how these properties influence the interaction with the staining agent, contributing to knowledge about the durability and aesthetic maintenance of ornamental stones in commercial use. Theoretical background: Ornamental stones, as well as being beautiful, must be durable and functional, maintaining their aesthetic, physical and chemical properties (ASTM, 2005). However, cleaning products, food and environmental factors can alter these characteristics. Aires-Barros (1991) defines this “alterability” as a function of intrinsic factors (material and porosity), extrinsic factors (environment) and time, which together determine the durability of stone. Method/project/approach: A study compared the behavior of three types of stone exposed to oil as a staining agent, applying a stain resistance test methodology. The procedure followed Document 20 of the ABIROCHAS Technical Documents Collection on the technological characterization of cladding stones and the practices described by Castilho (2018) in Technological Characterization of Ornamental Stones: Laboratory Practices. Results and conclusion: The study carried out in this work showed that the same slab of natural ornamental stone can have areas that are more susceptible to oil staining than other areas on the same slab. The areas with the finest crystalline texture and consequently the least expressive cracking were the areas least affected by oil staining. Another observation based on the results obtained was the loss of shine associated with the areas subjected to staining, even those where the stain was visually removed. In addition to these observations, the color of the ornamental stone, as well as the type of surface finish on the slabs, may also be important variables in the effect of oil staining, since the Anthracite stone with a black color and brushed surface finish was the lithotype that did not show stains after contact with oil. Implications of the research: Natural ornamental stone comprises materials with textural, compositional and structural heterogeneities observed even in a single slab, so the work seeks, through comparisons, to observe areas of greater susceptibility in natural ornamental stone slabs that can interact with oil staining agents. Originality/value: to contribute to the improvement of technologies that contribute to the best performance of natural ornamental stones, taking into account the type of resin and associated finishes.

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Influence of Textural and Compositional Heterogeneities on the Staining of Silicate Ornamental Rocks

Meyer,

Mattos,

Vale

et al. 2024

RGSA

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Considerations on Granite Dimension Stone Porosity and Modifications from Quarry to Slabs

Frascá

2013

KEM

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This paper presents the physical and petrographic characterization of selected granitic rock types from several quarries in Brazil and aims to contribute to a better knowledge of the engineering properties of granite dimension stone, focusing on laboratory physical determinations and the possible changes that would occur along processing operations, i.e., from the quarried rock to the polished slabs or tiles. The tests – petrography and porosity determinations – led to the collection of parameters of in natura and processed rock material, respectively from specimens obtained from small cubic blocks and polished slabs, situations considered representative of the stresses to which the rock is submitted to during the several processing stages. The results indicated that porosity tends to be higher for “tiles” than for “blocks”, and that “S-type granites” have higher porosity/open-pores values than “ordinary granites”, mainly due to their conspicuous microcracking. Moreover, in spite porous configuration may be modified during stone processing, it was found that such changes are not homogeneous and intrinsically associated to the petrographic characteristics, as previous microcracking and alteration states. Finally, as the new physical conditions, acquired after processing, may influence the stone durability, it is strongly suggested that they should be taken into account, as an additional criterion, to the cladding or flooring natural stone selection and specification.

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Influence of Dimension Stones on the Increase of Radon Gas Levels Indoors

Amaral¹,

Artur

Bonotto

et al. 2014

KEM

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The present work features results on the possible increase of radioactive 222Rn gas in environments of human habitation, caused by the use of dimension stones inside constructions with poor air circulation. For the study, “granitic” stones were selected from Espírito Santo and Minas Gerais states, commonly used as decorative stones and as wall covering. They were subjected to petrographic analysis, determination of physical indexes and level of U, and were monitored to quantify the amount of 222Rn gas released. The rates of 238U in the rocks stood between 2.9 ppm and 37 ppm, and the amount of 222Rn gas released ranged between extremely low for six of the stones (up to 98 Bq/m3) and moderate to considerably high (between 471 and 2483 Bq/m3) for four others. From the calculations to cumulatively evaluate the radiation levels generated by radon release, nine samples are below the limit of 4 pCi/L set by the EPA– Environmental Protection Agency (U.S.A.) and one is above that limit, demonstrating the role of these stones in increasing radon levels in ill-ventilated environments.

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Influência Da Textura E Da Mineralogia Na Porosidade Aparente, Absorção De Água E Densidade Aparente De Rochas Ígneas

Cited by 3 publications

References 0 publications

Influence of Textural and Compositional Heterogeneities on the Staining of Silicate Ornamental Rocks

Influence of Textural and Compositional Heterogeneities on the Staining of Silicate Ornamental Rocks

Considerations on Granite Dimension Stone Porosity and Modifications from Quarry to Slabs

Influence of Dimension Stones on the Increase of Radon Gas Levels Indoors

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