Abstract
During the operation of engineering structures made of natural stone, for industrial and civil purposes, an important parameter in monitoring their technical condition is the assessment of their reliability and safety under the influence of various external influences. In this case, high-quality monitoring of the stress–strain state of natural stone structures, its physical, mechanical and filtration properties, as well as internal structural features is necessary to study the possibility of replacing individual elements of objects that have lost their original characteristics. To assess the state of geomaterials, this article proposes using a complex of introscopic methods, including infrared radiometry and laser-ultrasound structuroscopy. An important aspect is the calculation based on the Green–Christoffel equation of the velocity of a quasi-longitudinal wave in limestone consisting of densely packed, chaotically oriented calcite grains with a small quartz content. For the first time, using laser-ultrasonic structuroscopy and standard methods for determining open porosity, both total and closed porosity were determined. This allowed us to find the values of specific heat capacities of dry and water-saturated samples. The obtained values are used to find the ratio of changes in the temperature of dry and water-saturated samples at the same stress values. The results obtained demonstrate the need to take into account changes in the intensity of thermal radiation of limestone with different moisture content under conditions of uniaxial compression, when identifying changes in the stress state of elements of stone structures in real conditions.
Highlights
Throughout human history, natural stone has been widely used as a material for monumental architecture and sculpture [1,2,3,4] as well as for industrial and civil construction [5,6]
Examples are the Moscow Kremlin, Athena’s Temple and Apollo’s Temple in Syracuse, and Spirito Santo Church in Melilli, all made of limestone, and modern buildings and subway stations with walls made of marble, granite, sandstone, etc
Our study demonstrates an integrated approach to laboratory research into thermo-mechanical processes in complexly structured heterogeneous materials under loading conditions
Summary
Throughout human history, natural stone has been widely used as a material for monumental architecture and sculpture [1,2,3,4] as well as for industrial and civil construction [5,6]. The interpretation of thermal IR radiation measurements is based on the well-known thermodynamic effects: changes in the temperature of solid bodies during their adiabatic deformation (‘thermoelastic’ and ‘thermoplastic’ effects) and temperature dependence of the intensity of infrared radiation emitted by the surface of solids It is shown in [37,38,39,40,41,42] that IR radiometry is an efficient method to identify stages of deformation of geomaterials of different types and water saturation effects [43]. Due to the narrow frequency ranges used in the above-mentioned studies, it was impossible to fully take into account the vibrational and rotational levels of all minerals, gases, and liquids in pores This method is quite effective for locating possible defects and assessing the water content and stress-strain behavior of materials. IR-radiometry were used to examine the structure properties with changing uniaxial stress and water saturation
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.
