scholarly journals On the Thermal Stresses Due to Weathering in Natural Stones

2021 ◽  
Vol 11 (3) ◽  
pp. 1188
Author(s):  
William Hideki Ito ◽  
Talita Scussiato ◽  
Federico Vagnon ◽  
Anna Maria Ferrero ◽  
Maria Rita Migliazza ◽  
...  
Keyword(s):  
Building Materials ◽  
Thermal Stresses ◽  
Central Italy ◽  
Theory Of Elasticity ◽  
International Standards ◽  
Natural Material ◽  
Physical Weathering ◽  
Mechanism Of Degradation ◽  
Ancient Times ◽  
Natural Stones

Natural weathering is known as one of the key mechanisms causing degradation in building materials. Great efforts have been made to develop new materials and new processes for protecting those that already exist. Natural stones are an example of a natural material that has been extensively used for building construction since ancient times. In addition, they fit durability, aesthetic, and mechanical requirements. Thus, they still have great importance in the construction business nowadays. Though chemical interactions in natural stones, such as oxidation or hydrolyses, have been widely studied, in the last few decades, the physical weathering due to daily temperature variations has begun to be considered as a key mechanism of degradation and has been incorporated in international standards. This process is particularly important in calcitic marble slabs, where it can cause extensive damages to facades. Consequently, there are restrictive rules for the use of marble as an external coating material in many countries. In this paper, the thermal stresses induced by daily variations in temperature are calculated using geographic and meteorological information. The concept of sol-air temperature is used to estimate the temperatures of the hidden and exposed surfaces of a slab, and Fourier’s law and the theory of elasticity are used to calculate the temperature and stress distribution, respectively. The proposed methodology allows for a detailed reconstruction of the stress induced inside marble slabs using parameters commonly acquired in meteorological stations as input data. The developed methodology was validated by comparing in-situ measurements of the temperature of a building in Pescara (Central Italy). A good correlation between the theoretical and real temperatures was found; in particular, the peak tensile stresses inside the slabs were estimated at 75 kPa.

Riqualificazione energetica e bioedilizia in Italia: lo stato dell'arte

2012 ◽  
pp. 74-88
Author(s):  
Livio de Santoli
Keyword(s):  
Energy Efficiency ◽  
Renewable Energy ◽  
Energy Consumption ◽  
Fossil Fuels ◽  
Building Materials ◽  
Heat Pumps ◽  
Building Envelope ◽  
International Standards ◽  
Solar Panels ◽  
Water Heaters

Building sustainability, in term of energy efficiency, low-impact building materials, renewable energy, has experienced significant growth during the past years. In response to the growing dependence on fossil fuels and importations, due in part to the increase of energy consumption in the residential sector (in 2009 46,9 Mtep, 3% more than 2008) and the recent European directives (i.e. EU 2009/28/CE) requiring CO2 emissions cut of up to 13% in 2020, there is interest in promoting energy efficiency and renewable energy technologies, which are suitable for residential applications. In this paper we present an overview on actions related to minimization of buildings energy consumption in Italy. Prevalent line of action is to improve the energy performances of building envelope (Dlgs 192/05) using insulated frames, walls and roofs and replacing heat generators with condensing boilers. In addition to national directives, ONRE Report 2011 (National Observatory on building regulations) shows that 831 Municipalities (10% more than 2010) establish mandatory targets for insulation, photovoltaic solar panels, solar water heaters, heat pumps use, correct buildings orientation, saving of water resource and local materials use. In addiction an efficient energy rating of the buildings could promote the spread of energy efficiency measurement and consequently facilitate their implementation. The new energy rating system should meet international standards, regarding environment and energy aspects, and respect territorial needs.

Axisymmetric Thermal Stresses in a Spherical Shell of Arbitrary Thickness

1957 ◽  
Vol 24 (3) ◽  
pp. 376-380
Author(s):  
E. L. McDowell ◽  
E. Sternberg
Keyword(s):  
Steady State ◽  
Spherical Shell ◽  
Spherical Cavity ◽  
Series Solution ◽  
Thermal Stresses ◽  
Solid Sphere ◽  
Theory Of Elasticity ◽  
Infinite Medium ◽  
Series Solutions ◽  
Arbitrary Thickness

Abstract This paper contains an explicit series solution, exact within the classical theory of elasticity, for the steady-state thermal stresses and displacements induced in a spherical shell by an arbitrary axisymmetric distribution of surface temperatures. The corresponding solutions for a solid sphere and for a spherical cavity in an infinite medium are obtained as limiting cases. The convergence of the series solutions obtained is discussed. Numerical results are presented appropriate to a solid sphere if two hemispherical caps of its boundary are maintained at distinct uniform temperatures.

Integrated geophysical and geotechnical monitoring for multiscale rock mass damaging investigation at the Acuto Field-Lab (Italy)

2021 ◽  
Author(s):  
Guglielmo Grechi ◽  
Danilo D'Angiò ◽  
Matteo Fiorucci ◽  
Roberto Iannucci ◽  
Luca Lenti ◽  
...  
Keyword(s):  
Rock Mass ◽  
Monitoring System ◽  
Thermal Stresses ◽  
Central Italy ◽  
Jointed Rock ◽  
Failure Behavior ◽  
Rock Masses ◽  
Geotechnical Monitoring ◽  
Strain Monitoring

<p>Rock mass damaging has become a topic of great interest in the engineering-geology research community during the last decades as it can significantly influence slopes stability. In this sense, the study of mechanics and dynamics of jointed rock masses represents a challenge because it will allow to better understand how external continuous and transient stressors can influence the short- to long-term stability controlling their pre-failure behavior. Consequently, the detection of permanent changes in physical and mechanical parameters, due to periodic or transient stressors, is an important target to mitigate the related geological risk as it can potentially lead rock masses to failure, especially when infrastructures and natural or cultural heritages are exposed elements. In this framework, the Acuto field laboratory (Central Italy) has been designed and implemented in 2016 within an abandoned quarry by employing an integrated geotechnical and geophysical monitoring system, with the aim of investigating how natural and anthropic conditioning factors could lead fractured rock masses to failure. The integrated monitoring system, which is installed on a potentially unstable 20-m<sup>3</sup> jointed rock block, is composed of several strain devices (i.e., strain gauges -SG- and jointmeters -JM-), one fully equipped weather station, one rock thermometer, eight high-sensitivity microseismic uniaxial accelerometers and optical and InfraRed Thermal cameras. The acquisition of long-term monitoring time-series, coupling multimethodological approaches, allowed to establish cause-to-effect relationships among different environmental stressors and induced strain effects, highlighting the continuous action of thermal stresses on rock mass deformations both at the daily and seasonal timescales. In fact, while the analysis of thermal and strain monitoring data allowed to characterize the cyclic contraction and relaxation response of major rock fractures and microcracks to temperature fluctuations, the microseismic monitoring array was able to detect during thermal transient (i.e., freezing conditions) the occurrence of microseismic emissions potentially related to the genesis or progressive growth of pre-existing cracks.</p><p>Starting from 2018, experimental activities at the Acuto field lab are supported by the “Dipartimento di Eccellenza” project of the Italian Ministry of Education Universities and Research funds attributed to the Department of Earth Sciences of the University of Rome “Sapienza”.  In this framework, the Acuto filed laboratory will undergo a structural upgrade that will be aimed at the investigation of two new sectors of the abandoned quarry. These new sectors will be instrumented with innovative thermal profiles probe, fiber Brag grating sensors and traditional SG and JM for detailed stress-strain monitoring, acoustic emission sensors and high-frequency and low-frequency geophones for ambient seismic noise monitoring and microseismic events detection as well as accelerometers for evaluating the rock mass response in the case of seismic shaking. The main goal of such an improvement will be both technical and methodological, and will shed light on the application of integrated geophysical and geotechnical monitoring approaches in investigating the multiscale rock mass damaging process as well as the detection of rock mass failure precursors by using non-conventional combinations and configurations of geotechnical and broad-band geophysical devices.</p>

Conclusions

2015 ◽  
Author(s):  
Charlotte R. Potts
Keyword(s):  
Iron Age ◽  
Building Materials ◽  
Central Italy ◽  
Future Research ◽  
Main Body ◽  
Monumental Architecture ◽  
Form And Function ◽  
Religious Buildings ◽  
Religious Architecture ◽  
And Function

This book began by stating that histories of religious architecture can be accounts of both buildings and people. This particular history, focused on the archaeological evidence for the development of cult buildings in early central Italy, has reconsidered traditional narratives about the form and function of Etrusco-Italic religious architecture and proposed an alternative reconstruction of how their architects and audiences may have interacted with one another in Rome, Latium, and Etruria between the ninth and the sixth centuries BC. Comparison with the construction of monumental temples elsewhere also indicated that settlements including Rome, Satricum, Pyrgi, and Tarquinia can perhaps be considered part of a network of Archaic Mediterranean settlements with material, commercial, and religious connections, and that monumental architecture may have been a mechanism for successful social interaction. This study has therefore supported the suggestion that the physical and social fabric of ancient communities were closely linked, and that regional studies of Latium and Etruria may furthermore benefit from being set in Italic and Mediterranean contexts. This concluding chapter briefly recapitulates the arguments made in the main body of the book and the significance of each of those arguments for studies of ancient architecture and society. It also assesses how these findings relate to broader debates about Archaic Italy. Finally, it acknowledges the limitations of this analysis and highlights opportunities for future research. Part I of this book demonstrated that ancient religious architecture was a protean phenomenon. Three chapters analysed the ambiguous evidence for Iron Age sacred huts, the range of different buildings types associated with ritual activities in the seventh century BC, and the emergence of a separate architectural language for religious buildings during the Archaic period. Detailed analyses of foundations and roofs revealed that as changes in technology and society led to the widespread use of more permanent building materials, the physical fabric of central Italic settlements was also increasingly marked by the use of particular architectural forms and decorations to differentiate cult buildings from other structures, setting them apart in a form of architectural consecration.

Beobachtungen zum Stofftransport und zu einhergehenden Schädigungseffekten in porösen Baustoffen / Observations of mass transport and related deterioration mechanisms in porous building materials

2000 ◽  
Vol 6 (4) ◽  
pp. 451-462 ◽  
Author(s):  
L. Franke ◽  
R. Reimann-Oenel
Keyword(s):  
Building Materials ◽  
Life Time ◽  
Water Repellent ◽  
Historic Buildings ◽  
Time Behaviour ◽  
Long Time Behaviour ◽  
Long Time ◽  
Natural Stones ◽  
Coated Surfaces ◽  
Theoretical Considerations

Abstract It is reported about substance migration problems and their consequences, which have been investigated experimentally and which could be particularly relevant with regard to repair and restoration of historic buildings. One aim of the investigations was to find out, whether facades, treated with water repellent agents, showing non treated areas, can be affected in their long time behaviour. Such lacks can be due to non careful application of the repellent agent. In addition, investigations were made to find out. of coatings on salt containing mineral substrates, especially natural stones can reduce their life time. As a result of the experiments and the theoretical considerations, it follows, that a lack in water repellent treatment. could cause the risk of crust-development spallings in environment of non treated spots in the case that substrate is salt contaminated and moisture exchange takes place. All experiments with coatings, performed under the same conditions, show, that the coated surfaces have a more favourable behaviour than the same surfaces without coatings.

Technology of Building Composites on the Basis of Portlandite-Aluminosilicate Contact Condensation Systems of Hardening

2019 ◽  
Vol 802 ◽  
pp. 79-90
Author(s):  
Alexander Valerievich Tereshkin ◽  
Irina Vladimirovna Kirichkova ◽  
Vladimir Viktorovich Kruglyak
Keyword(s):  
Energy Efficiency ◽  
Building Materials ◽  
Resource Saving ◽  
Technological Developments ◽  
Ancient Times ◽  
Contact Condensation ◽  
Construction Practice

Since ancient times, lime, lime pozzolanic, lime-cement, lime-clay binders, the compositions of which our ancestors found empirically, widely and everywhere used in construction. Even in the first half of the XX century, these binders occupied a significant place in the construction practice. The development of production and the relative availability of cement led to a significant reduction in demand for many clinker-free, including lime (Portland) binders. Today, the priorities of scientific and applied technological developments of both traditional building materials and materials of new generations are determined by the actualization of the concept and criteria of resource saving and energy efficiency.

scholarly journals Assessment of the competitiveness of industrial companies and methods for assessing the quality of construction products

2020 ◽  
Vol 164 ◽  
pp. 09027
Author(s):  
Olga Safonova ◽  
Lyudmila Tatarnikova
Keyword(s):  
Quality Management ◽  
Product Quality ◽  
Management System ◽  
Building Materials ◽  
Quality Management System ◽  
Iso 9000 ◽  
International Standards ◽  
Specific Method ◽  
Product Management

The model of a quality management system based on international standards ISO 9000 series is recognized in all the world. The aim of the article is to show the competitive advantages of a construction company in the modern market by improving its quality and product management system. We consider the implementation of the provisions of international standards ISO 9000 series as an effective solution to the problem. Quality improvement is a continuous work aimed at improving the technical level of product quality, quality of its manufacture, improving production elements and the quality system itself. The authors of the article give a specific method for improving the enterprise quality management system with a developed sequence. A risk-based approach to creating an enterprise quality management system was also considered. The main research methods in assessing the technical condition of certain building materials are differential, integrated and mixed methods. The authors show the calculation procedure using these methods, as well as the main results of their application. Then, the article provides a methodology for calculating the level of product quality, which is evaluated by a set of indicators, which do not include economic indicators.

scholarly journals Frost Resilience of Stabilized Earth Building Materials

Geosciences ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 328 ◽  
Author(s):  
Alan W. Rempel ◽  
Alexandra R. Rempel
Keyword(s):  
Building Materials ◽  
Thermal Stresses ◽  
Fiber Type ◽  
Damage Index ◽  
Material Design ◽  
Ambient Air ◽  
Frost Damage ◽  
Embodied Energy ◽  
Surface Erosion ◽  
Air Temperatures

Earth-based building materials are increasingly valued in green design for their low embodied energy, humidity-buffering ability, and thermal stability. These materials perform well in warm dry climates, but greater understanding of long-term durability is needed for successful adoption in colder and/or wetter climates. The presence of stabilizers dramatically improves resistance to surface erosion from wind and rain, compared to unstabilized adobe and cob counterparts, and the influences of soil composition, fiber type, and diverse binders, on rain and wind surface erosion have been investigated in detail. Frost and freeze-thaw resistance, however, have been less well-studied, despite strong interest in stabilized earth materials in northern North America, Europe, and Asia. In particular, recent studies have relied on a widespread misunderstanding of the mechanism by which frost damage occurs in porous materials that will impede efforts to create valid models for material design and improvement. In addition, the influence of radiative thermal stresses on wall surfaces has been overlooked in favor of focus on ambient air temperatures. Here, we apply contemporary understanding of cracking by segregated ice growth to develop a macroscopic damage index that enables comparison between performance of different materials subject to different weather patterns. An examination of predicted damage patterns for two stabilized earth building materials and two conventional materials in twelve cities over two time periods reveals the dominant factors that govern frost vulnerability. We find that the frost resilience of earth building materials is comparable to that of the conventional materials we examined, and that assessments that neglect expected variations in water content by assuming full saturation are likely to yield misleading results. Over recent years, increased winter temperatures in several cities we examined predict reduced material vulnerability to frost damage, but we also find that accompanying increases in humidity levels have made some cities much more vulnerable.

Irrigation, groundwater exploitation and cult of water in the rural settlements of Sabina, Central Italy, in Roman times

2007 ◽  
Vol 7 (1) ◽  
pp. 191-199
Author(s):  
A. Di Leo ◽  
M. Tallini
Keyword(s):  
Industrial Development ◽  
Central Italy ◽  
Family Farms ◽  
Rural Settlements ◽  
Groundwater Exploitation ◽  
Trade Routes ◽  
Water Pipes ◽  
Tiber River ◽  
Adriatic Coast ◽  
Ancient Times

Archaeological surveys conducted in Sabina, about 50 km away from Rome, intended to reconstruct the ancient agricultural and pastoral landscape. They identified interesting remains of roman small family farms at Montenero Sabino and Mompeo (province of Rieti), villages located near Via Salaria (the “salt way”) and the Farfa stream, a tributary of the Tiber River, which in ancient times, both were the main trade routes of central Italy, linking Rome to the Apennines and to the Adriatic coast. There a network of underground channels and tanks, fictile water pipes and pools, at times connected to one another, was found. Many of them are still used today, given the low population growth and the lack of modern industrial development of this area and to its isolation, in spite of its proximity to Rome. Moreover the study area holds a votive stone dedicated to the Sabine-Roman goddess of water Vacuna, a multiform Sabine and Central-Italic goddess with many characteristics and functions, known also as Minerva-Bellona-Victoria, Feronia, Caerere, or as Angerona-Angitia. It was related to an agricultural-pastoral shrine for the cult of water whose anthropological relevance still survives in yearly livestock fairs and in the local worship of the Holy Mary of parturients.

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