The great abundance of coherent volcanic and calcareous tuffs throughout some Italian Regions, the ease with which they can be quarried and worked, and their reasonable compression strength characteristics have made this material a very popular one for construction purposes ever since ancient times. This paper is one product of research aimed at characterizing, from the geological, petrographic and technical points of view, the coherent volcanic and calcareous tuffs used in the construction of historic buildings since the days of ancient Italy. After a short description of the technical characteristics of some of the most widely used coherent volcanic and calcareous tuffs and after briefly mentioning some examples of how they are employed in the construction area, a detailed presentation is given of geological, petrographic and technical properties of some vulcanic tuffs coming from Latium Region and some calcareous tuffs coming from the Murgia zone in Apulia Region. Both of these material were wide employed in ancient monumental building in Italy. The growing need for technical intervention aimed at the rehabilitation and conservation of buildings of great historic value, built with these materials, require a greater and greater knowledge of their technical characteristics. This paper presents results of many tests carried on some hundreds of samples of these materials to simulate effects of weathering on their technical and mechanical properties. In particular, the authors carried out the following kinds of tests to study different behaviours of these materials at different kinds of weathering: a) Cycles of immersion in oversaturated solutions of sodium sulphate and drying at 100°C; b) ambient humidity for few days; c) water-saturated atmosphere at 22° C; d) cycles of frost - defrost; e) cycles of immersion and drying. Results coming from these kinds of tests are presentes in this paper, where are also discussed some mathematical relations between degree of weathering of these materials and their technical and mechanical behaviour.
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|Titolo:||Technical properties of some calcaereous and volcanic tuffs, used in building activities in Italy, and effects of weathering of their technical behaviour|
|Data di pubblicazione:||1995|
|Appartiene alla tipologia:||04a Atto di comunicazione a congresso|