Monument Future. Siegfried Siegesmund

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       COMPARATIVE ANALYSIS OF VOLCANIC TUFFS FROM EUROPE, ASIA AND NORTH-AMERICA

Ákos Török¹, Luigi Germinario¹, Rubén López-Doncel², Christopher Pötzl³, Siegfried Siegesmund³

      IN: SIEGESMUND, S. & MIDDENDORF, B. (EDS.): MONUMENT FUTURE: DECAY AND CONSERVATION OF STONE.

       – PROCEEDINGS OF THE 14TH INTERNATIONAL CONGRESS ON THE DETERIORATION AND CONSERVATION OF STONE –

       VOLUME I AND VOLUME II. MITTELDEUTSCHER VERLAG 2020.

      1 Budapest University of Technology and Economics, Department of Engineering Geology and Geotechnics, Megyetem rkp. 3, H-1111 Budapest, Hungary ([email protected])

      2 Geological Institute, Autonomous University of San Luis Potosí, Mexico

      3 Geoscience Centre of the University of Göttingen, Goldschmidtstr. 3, 37077 Göttingen, Germany

       Abstract

      In this study, volcanic tuffs from Europe (Germany and Hungary), Asia (Armenia) and North-America (Mexico) are compared. The physical properties (density, porosity and pore-size distribution, strength) and mineralogical composition of basic, intermediate and acid volcanic tuffs were measured in laboratory conditions aiming to evaluate these parameters in terms of stone durability. The colour of rhyolitic to andesitic tuffs, the amount of lithic clasts and the proportion of groundmass vary. The mineralogical composition, porosity and textural characteristics of the studied tuffs are very different. The comparative analysis suggested that clay content and distribution within the pores, the amount of glassy groundmass, porosity and pore-size distribution, as well as hygric swelling and thermal behaviour of the tuffs, are the main control factors of the durability.

       Introduction

      Volcanic tuffs are important lithotypes of our cultural heritage. The material characteristics and the worldwide occurrence allow a widespread use from sculptural elements to massive built structures such as castles and fortresses. Despite the extensive use of tuffs, these materials are prone to weathering and show various forms of decay due to their mechanical properties, textural variability and high porosity.

      The current paper provides an overview of the petrophysical, mechanical and petrographic properties of tuffs from Europe, Asia, and North-America. It presents the geological setting and utilisation of these tuffs. It outlines the decay features that are linked to external factors and discusses the differences in durability linked СКАЧАТЬ