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The effect of surface finishes on outdoor granite and limestone pavers

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Author(s): García del Cura, M. A. | Benavente, D. | Bernabéu, A. | Martínez-Martínez, J.

Journal: Materiales de Construccion
ISSN 0465-2746

Volume: 58;
Issue: 289-290;
Start page: 65;
Date: 2008;
Original page

Keywords: stone pavers | granite | limestone | surface finishes | freeze-thaw resistance | Pavimentos pétreos | granito | caliza | acabados superficiales | resistencia a la heladicidad

ABSTRACT
Two types of ornamental stones, namely granite (Blanco Rafaela or Zarzalejo Granite) and microcrystalline limestone (marble known commercially as Gris Pulpis), treated for different surface finishes, were tested for suitability as paving slabs. The finishes tested in both stones were polishing, hammering, honing and flaming, while acid treatment and abrasion were applied to limestone only and sawn finishes were only studied in granite.The stones were tested for the three physical properties that determine suitability for use as paving slabs; flexural strength under a concentrated load, and abrasion and slip resistance. Laboratory freeze-thaw cycle ageing tests were also conducted and flexural strength subsequently evaluated. Stone water sorption proved to be substantially unaltered by the type of finish employed. Finish barely affected flexural strength, except in the case of limestone flaming, where it was lower. Hammering was found to provide good slip resistance in both stones. The best slip performance for granite, however, was found for flamed specimens. Finish was shown to have no effect on abrasion resistance in either of the stone materials. Polished limestone suffered the least damage in freeze-thaw cycles, whereas freeze-thaw resistance was similar in all the granite specimens, regardless of the finish used.Se han estudiado, para su utilización como baldosas de pavimentos, granito (Blanco Rafaela o Granito de Zarzalejo) y caliza microcristalina (mármol comercial Gris Pulpis) con diferentes acabados. Estos acabados son: pulido, apomazado, abujardado y flameado en ambas rocas y además acabado al ácido y amolado en la caliza. Se han determinado mediante ensayos estandarizados las tres propiedades físicas de mayor interés para el uso de la piedra natural como baldosa en pavimentos de exteriores: resistencia a la flexión bajo carga concentrada, a la abrasión y al deslizamiento. Se han realizado ensayos de durabilidad por ciclos de hielo-deshielo con posterior evaluación mediante determinación de resistencia a flexión. Se ha estudiado el comportamiento hídrico de los diferentes acabados. Las rocas no ven alterado sustancialmente su comportamiento hídrico por el tipo de acabado. El tipo de acabado apenas influye en la resistencia a flexión en las rocas estudiadas, salvo el acabado flameado que disminuye considerablemente dicha resistencia en las calizas. El acabado abujardado presenta un buen comportamiento frente al deslizamiento en ambas rocas. El acabado flameado presenta los mejores valores de resistencia al deslizamiento en granitos. El tipo de acabado no influye significativamente en la resistencia a la abrasión en ambos materiales pétreos.El acabado pulido en calizas es el menos alterado por los ciclos de hielo-deshielo. Todos los acabados de los granitos presentan similar comportamiento frente a los ciclos de hielo-deshielo.
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