Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Development of new techniques to understand marble quality and durability

09.05.2008
The international commerce of ornamental stones has grown all over the world in the last years, revealing a decided solid support to the aesthetics of natural stones in buildings construction and urban ornamentation.

Marble is, undoubtedly, the ornamental stone par excellence. All through history, numerous civilizations have architectural or sculptural works which constitute the most important pieces of their historic heritage. Despite this, nowadays we have a very limited understanding about the intrinsic features which affect marble durability/changeability.

This fact is paradoxical in countries such as Spain, with a rich historic heritage in marble and one of the most important producing and exporting countries at a worldwide scale of this type of ornamental stone.

Researchers of the University of Granada, led by Prof Eduardo Sebastián Pardo, and of the University of Gotinguen (Germany), led by Prof Siegfried Siegesmund, collaborate in a project to explain the causes for marble physical decay and design new identification and conservation methods.

The study, says Prof Sebastián, permits to “dictate recommendations referred to the specific use of ornamental marble, when they are used in buildings’ external coatings and other constructive functions”. Selection criteria are based on stone intrinsic features. Therefore, the analysis deals with an exhaustive characterization of materials, their petrography and their physical properties.

Studied marbles
The goal is to set an analytical proceeding to determine which types of marble are the most appropriate for construction purposes, as well as the best environment and conditions for their maintenance. The objective is to prevent the phenomenon of marble decay observed in many European buildings, often developed in very short spaces of time (even less than three years after their construction).

The studies have been carried out on different commercial marbles in Spain and Germany, as well as in those marbles historically used for certain constructive and ornamental functions. In the case of Spain, they have analysed the most commercialized varieties of marble in Andalusia, as well as those historically used in emblematic constructions of the Andalusian Architectural Heritage. “Marbles selection has been carried according to their micro-structural and textural features, especially their size and degree preferred crystallographic orientation, mineralogical composition and level of crystallographic and/or physical-mechanical anisotropy. Specifically, marbles from Macael, Almería; Huelva (Blanco Agua, Blanco Aroche and Almaden de la Plata marbles); Blanco Ibérico marble from Alhama de Granada and from Mijas de Málaga”.

Marble prints
Such analysis will also allow to understand the specific features of every stone (their “fingerprints”) to determine their origin and, therefore, protect their emblematic prints against others from different geographic origins. “In a globalized sector like that of natural stone –says Sebastián- this is a key factor, as the purchase of stone is very frequent in countries where manpower costs are very cheap, giving rise to a strong loss of competitiveness of higher quality indigenous marbles. One of the most effective ways to compete with the ornamental stone of such countries is the creation of prestigious brands linked to natural stone”.

This research group has been working on durability assessment of ornamental stones through accelerated ageing tests since the nineties (http://www.ugr.es/~monument).

Reference: European Union – Integrated Action “Anisotropy of marbles: A key in the understanding of marble decay”, led by Professors S. Siegesmund (Department of Structural Geology and Geodynamics, Geosciences Centre of the University of Gottingen) and E. Sebastián Pardo (University of Granada, Department of Mineralogy and Petrology).

Prof Eduardo Sebastián Pardo. Department of Mineralogy and Petrology. University of Granada. Phone number (34) 958 243 340 E-mail. rolando@ugr.es

Antonio Marín Ruiz | alfa
Further information:
http://prensa.ugr.es/prensa/research/index.php

More articles from Ecology, The Environment and Conservation:

nachricht Minimized water consumption in CSP plants - EU project MinWaterCSP is making good progress
05.12.2017 | Steinbeis-Europa-Zentrum

nachricht Jena Experiment: Loss of species destroys ecosystems
28.11.2017 | Technische Universität München

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

Im Focus: Virtual Reality for Bacteria

An interdisciplinary group of researchers interfaced individual bacteria with a computer to build a hybrid bio-digital circuit - Study published in Nature Communications

Scientists at the Institute of Science and Technology Austria (IST Austria) have managed to control the behavior of individual bacteria by connecting them to a...

Im Focus: A space-time sensor for light-matter interactions

Physicists in the Laboratory for Attosecond Physics (run jointly by LMU Munich and the Max Planck Institute for Quantum Optics) have developed an attosecond electron microscope that allows them to visualize the dispersion of light in time and space, and observe the motions of electrons in atoms.

The most basic of all physical interactions in nature is that between light and matter. This interaction takes place in attosecond times (i.e. billionths of a...

Im Focus: A transistor of graphene nanoribbons

Transistors based on carbon nanostructures: what sounds like a futuristic dream could be reality in just a few years' time. An international research team working with Empa has now succeeded in producing nanotransistors from graphene ribbons that are only a few atoms wide, as reported in the current issue of the trade journal "Nature Communications."

Graphene ribbons that are only a few atoms wide, so-called graphene nanoribbons, have special electrical properties that make them promising candidates for the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

Blockchain is becoming more important in the energy market

05.12.2017 | Event News

 
Latest News

Making fuel out of thick air

08.12.2017 | Life Sciences

Rules for superconductivity mirrored in 'excitonic insulator'

08.12.2017 | Information Technology

Smartphone case offers blood glucose monitoring on the go

08.12.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>