Print Email Facebook Twitter Effect of moisture on tuff stone degradation Title Effect of moisture on tuff stone degradation Author Lubelli, B. (TU Delft Heritage & Technology; TNO) Nijland, TG (TNO) Contributor Kielsgaard Hansen, Kurt (editor) Rode, Carsten (editor) Nilsson, Lars-Olof (editor) Date 2016 Abstract Tuff stone elements with a large length/width ratio often suffer damage in the form of cracks parallel to the surface and spalling of the outer layer. The response of tuff to moisture might be a reason for this behaviour. This research aimed at verifying if differential dilation between parts with different moisture content (as outer and inner part of partially encased mullion) can lead to damage. The effect of moisture on the degradation of Ettringen and Weibern tuff from the Eifel, Germany, has been investigated. A purpose-made weathering test was carried out to simulate the wetting-drying process. Despite no cracks developed during the test, existing cracks widened up and the flexural tensile strength of both materials decreased. The moisture transport properties their porosity and pore size of the stones were determined. Ettringen tuff has a considerable amount of very fine porosity, resulting in slow moisture transport and significant hygroscopic adsorption. Both tuff stones have an extreme hydric dilation. Environmental X-ray diffraction analyses showed that Ettringen tuff undergoes (reversible) mineralogic changes when subjected to RH cycles, whereas this does not occur for Weibern. The results support the hypothesis that moisture gradients in tuff elements may enhance decay in this stone. To reference this document use: http://resolver.tudelft.nl/uuid:1e89c390-06d5-4647-8395-257233964813 Publisher RILEM Publications S.A.R.L., Paris, France Access restriction Campus only ISBN 978-2-35158-178-0 Source Proceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016: Segment on Moisture in Materials and Structures Event International RILEM Conference on Materials, Systems and Structures in Civil Engineering, 2016-08-22 → 2016-08-24, Technical University of Denmark, Lyngby, Denmark Part of collection Institutional Repository Document type conference paper Rights © 2016 B. Lubelli, TG Nijland Files PDF Lubelli_Nijland_tuffstone ... EM2016.pdf 397.53 KB Close viewer /islandora/object/uuid:1e89c390-06d5-4647-8395-257233964813/datastream/OBJ/view