Abstract
Some materials undergo hygric expansion when soaked. In porous rocks, this effect is enhanced by the pore space, because it allows water to reach every part of its volume and to hydrate most swelling parts. In the vicinity, this enlargement has negative structural consequences as adjacent elements support some compressions or displacements. In this work, we propose a normalized cross-correlation between rock surface texture images to determine the hygric expansion of such materials. We used small porous sandstone samples (11 × 11 × 30 mm3) to measure hygric swelling. The experimental setup comprised an industrial digital camera and a telecentric objective. We took one image every 5 min for 3 h to characterize the whole swelling process. An error analysis of both the mathematical and experimental methods was performed. The results showed that the proposed methodology provided, despite some limitations, reliable hygric swelling information by a non-contact methodology with an accuracy of 1 micron and permitted the deformation in both the vertical and horizontal directions to be explored, which is an advantage over traditional linear variable displacement transformers.
Highlights
University Institute of Physics Applied to the Sciences and Technologies, University of Alicante, P.O
Strain measurement due to hygric swelling is an important parameter to assess the suitability of a particular sandstone rock in the construction and restoration of historic buildings
Thisisisaapreferred preferred proceduretotothe the other strategy, which consists of interpolating the image itself, as this procedure can induce sysstrategy, of interpolating interpolatingthe theimage imageitself, itself, this procedure induce strategy,which which consists consists of asas this procedure cancan induce systematic errors due to inaccurate subpixel image reconstruction systematic digital image cross-correlation (DIC) errors due to inaccurate subpixel image reconstruction [14]
Summary
Box 99, Citation: Ferrer, B.; Tomás, M.-B.; Abstract: Some materials undergo hygric expansion when soaked In porous rocks, this effect is enhanced by the pore space, because it allows water to reach every part of its volume and to hydrate most swelling parts. This effect is enhanced by the pore space, because it allows water to reach every part of its volume and to hydrate most swelling parts In the vicinity, this enlargement has negative structural consequences as adjacent elements support some compressions or displacements. Use of Image Correlation to Measure Macroscopic Strains by Hygric Swelling in Sandstone Rocks. It implies the volume increment of some rock particles, which causes strains, stresses and, depending on the rock composition, a global volume increment in rock. Strain measurement due to hygric swelling is an important parameter to assess the suitability of a particular sandstone rock in the construction and restoration of historic buildings
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
