Resumen de El sistema poroso de las areniscas y microconglomerados silicificados de Zamora tras la alteración experimental por hielo/deshielo
Jacinta García Talegón, R. Hinojal, A. C. Iñigo Iñigo, Gaspar Alonso Gavilán, E. Molina
The main factors and mechanisms involved in the decay of the building sandstones and microconglomerates are essentially related to the sharp temperature changes (thermoclasty) and feezing/thawing (gellifraction) is by that, in this work was made the experimental alteration of freezing/thawing and thermal shock of the stones. The studies concern physical properties of the different silicified sandstones and microconglomerates materials used in the construction and the successive restorations of the Cathedral of Zamora. The pore system is made in water, and also by using Hg-porosimeter. Determination of the following properties was carried out: total and open porosity, real and apparent density, absorption of water by total immersion, capillary absorption and pore size distribution. The water movement by capillarity absorption and pore network by Hg injection on fresh on artificial aged stone materials. Changes in pore size distribution are observed in samples where a pore network already exists in the unaltered samples. Variation in porosity observed upon experimental ageing are similar to those observed in historical building stones after weathering.
