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Juan José Tejado Ramos

Juan José Tejado Ramos
INTROMAC · Departamento ROPOC

PhD

About

43
Publications
5,513
Reads
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202
Citations
Additional affiliations
January 1995 - January 1999
GEOSERVICES
Position
  • Mud-Logger
Description
  • Offshore & onshore geologist
Education
September 2014 - September 2014
Universidad de Extremadura
Field of study
  • Physics
September 1999 - September 1999
Complutense University of Madrid
Field of study
  • Hydrogeology
September 1988 - June 1993

Publications

Publications (43)
Article
Wolfram is an essential element for the development of technology. Its hardness and heat resistance have contributed to its high consumption especially in the production of hard materials, alloys, shielding, steel and chemical compounds. In contrast, it is considered a rare element due to its scarce abundance, under 2 ppm in the Earth’s crust. Its...
Book
Full-text available
Guide for the knowledge of radon gas in Extremadura and its applicability in the building sector
Article
Full-text available
Velocidad de ultrasonidos en las cuernas del ciervo ibérico: una medición no invasiva de la densidad y un posible índice de la calidad relativa Las cuernas de ciervo pueden usarse como un índice de calidad individual, tanto en contextos ecológicos como productivos. Por lo general, la calidad de las cuernas se mide solo por sus características biomé...
Article
Full-text available
Granite quarrying is one of the main industries operating in Spain, and was severely affected by the economic crisis that began in 2008. Although the industry is slowly recovering from this event, new construction activity has not fully recovered. For a company to be competitive in the stone market, it must consider the overall characteristics of t...
Book
Full-text available
Geolodia (virtual) que tiene como objeto dar a conocer el granito comercial "Gris Quintana", su origen geológico y el aprovechamiento tanto tradicional como moderno y contemporáneo que se da a esta roca ornamental tan conocida tanto dentro como fuera de Extremadura.
Article
Full-text available
Currently, intervention in heritage is a task of social need. Non-destructive techniques are often used to carry out conservation and maintenance tasks. In the present. In this work we study the necessary calibration mode of a hyperspectral camera used in the characterization of the material to be conserved or to intervene. This camera is used to c...
Book
Full-text available
Tenemos la satisfacción de presentar la segunda entrega de los APUNTES GEOLÓGICOS DE LA PROVINCIA DE CÁCERES, con el objetivo de estudiar y divulgar la Geología en Extremadura, y lo hacemos manteniendo una colaboración muy fructífera con el Geoparque Mundial de la UNESCO Villuercas-Ibores-Jara, auspiciado por la Diputación de Cáceres, igual que en...
Book
Full-text available
Uno de los requisitos esenciales para disfrutar en una excursión geológica es comprender lo que se está observando. En la provincia de Cáceres tenemos la posibilidad de visitar muchos y variados parajes con elevado interés geológico, científico, didáctico y recreativo. El rico Registro Geológico de esta provincia resulta desconocido para el gran pú...
Book
Full-text available
La explotación mineral de hierro de La Jayona se produjo desde principios de siglo hasta 1921 en que se paraliza definitivamente la actividad. Los años transcurridos desde el abandono de la mina La Jayona en el término municipal de Fuente del Arco han contribuido a la creación de un espacio de una especial singularidad, no sólo por el espectacular...
Book
Full-text available
History, ethnography, nature, geology, mining and heritage are the main points of the Mina La Jayona Natural Monument (a outdoor museum of natural sciences). People must discover them to understand the importance of this so peculiar natural protected space in Extremadura. The edition has been coordinated by Carmen Crisóstomo Miranda, Eduardo Reboll...
Article
Abbreviations: BCR-SEP: optimized BCR sequential extraction procedure; b.d.l: below the detection limit; F1: weakly adsorbed, exchangeable and water- and acid- soluble fraction; F2: reducible fraction; F3: oxidable fraction; F4: residual fraction; HM: heavy metal; ICP-MS: inductively coupled plasma-mass spectroscopy; LOI: loss on ignition; LWA: li...
Article
Full-text available
Tras un largo periodo de convivencia, la Directiva 2013/641 EURATOM del Consejo de la Unión Europea, obliga a los Estados miembros a su transposición, poniendo en vigor las disposiciones legales, reglamentarias y administrativas necesarias para dar cumplimiento a lo establecido en ella, a más tardar el 6 de febrero de 2018 (Artículo 106). En esta D...
Article
Workers in the granite industry face an occupational hazard: silicosis due to the crystalline silica present in inhalable dust. As granite can also present a variable, and occasionally significant, content of naturally occurring radionuclides, they may also face a radiological hazard. In order to assess the risk, a granite industry with a quarry an...
Article
Washing aggregate sludge (WAS) from a gravel pit and sewage sludge (SS) from a wastewater treatment plant (WWTP) were analysed in terms of their physical, mineral and chemical characteristics. Both waste materials were mixed, milled and made into granules, pre-heated for 2 and 5 min and sintered in a rotary kiln at temperatures between 1175 °C and...
Poster
Historical buildings in Europe and around the world are inevitably starting to show the damage that natural processes and anthropogenic actions, over time, have inflicted on them. Deterioration is shown in the aesthetic features of buildings but also in the main structural members of constructions. Results of unwise actions have been widely observe...
Poster
Extremadura has three World Heritage Sites declared by UNESCO: the old town of Cáceres, the archaeological site of Merida and the monastery of Guadalupe. Guadalupe Monastery is built mainly of bricks and masonry. In Merida, granites and diorites of various facies of batholiths located in the north of the city, Sierra Carija’s marble and quartzite a...
Article
The Ossoue glacier in the Vignemale massif (3,298 m) is currently the longest and second largest of the Pyrenees (1,400-m length, 50-ha area), and the only one presenting glacier tongue morphology. We describe 50 MHz ground penetrating radar (GPR) and laser scanner surveys from which we assess the current state and dynamics of the glacier. In 2011,...
Thesis
The granites, in general, have high contents of natural radionuclides, and their mining and processing industries can be classified like NORM activities (Naturally Occurring Radioactive Materials). Thanks to the industrial importance of the Ornamental Stone Sector in Extremadura, especially granite sector, this industry can be considered as a strat...
Article
The extraction and processing of ornamental stone, and granite in particular, generates a huge amount of wastes, which are usually disposed into slag heaps and subjected to weathering. Granite presents also higher content of naturally occurring radionuclides (40K, 226,228Ra, 234,238U, 210Po, and 228,230,232Th). A small-scale granite processing comp...
Poster
“Gris Quintana” granite has been used since ancient times, not only at a regional, but also at national and international level: paving, building (structural, exterior façadas, interior uses), urban decoration and funeral art. It can be found in monuments and more recently, in buildings of different styles and uses, that stand out in beauty and spl...
Poster
Several granites are quarried in Extremadura, Spain, with very good aesthetic and physic and mechanical characteristics. “Azul Platino” has a striking bluish colour and its properties make this granite a perfect option for most applications as ornamental rocks. This granite has been used for centuries, first in the architectonic heritage of the ext...
Article
The term "commercial granite" comprises different natural stones with different mineralogical components. In Extremadura, western Spain, "commercial granites" can be classified in three types: granite s.s. (sensus stricti), granodiorite, and diorite. The content of naturally occurring radionuclides depended of the mineralogy. Thus, the (40)K conten...
Conference Paper
Full-text available
The Ossoue glacier in the Vignemale massif (3298 m) is currently the longest and second largest of the Pyrenees (1400 m length and 50 ha of surface) and the only one presenting glacier tongue morphology. This glacier has been observed and studied for several centuries. This work presents the Ground Penetrating Radar (GPR) survey carried out on the...
Article
Full-text available
In the area of Trujillo (Extremadura, Spain) we have found a variety of striking bluish and secondary yellow granites outcropping within the Plasenzuela pluton. They are all quarried under different names and are characterized by leucocratic minerals in which a bluish phosphate is dispersed throughout the rock. Their physical and mechanical propert...
Conference Paper
Full-text available
Intervention on real estate is an opportunity to clarify and increase awareness of its constituent materials, nature, origin and possible alterations sustained over time. The selection of a set of monuments of Extremadura with some type of deterioration, has enabled first defined on one of them, a protocol of diagnosis from destructive and non dest...
Conference Paper
Full-text available
Serpentinites are very handsome rocks. They occur from the weathering of ultramafic rocks (e.g. peridotites, pyroxenites) and their origin and posterior events that affect them produce colours and textures that make these rocks usable for many building construction and structures. However, serpentinites can be very different among them, depending o...
Conference Paper
Full-text available
El sector minero se ha caracterizado por ser uno de los mayores impulsores de la economía nacional, junto con la agricultura, ganadería y la industria básica. Quizá por ello la sociedad conoce bastante bien los problemas derivados de su desarrollo, entre otros los ambientales, por tener repercusión en ocasiones a escala regional. Sin embargo, resul...
Article
Full-text available
Ponencia presentada en el XIX Congreso Internacional de Acústica (ICA2007), Madrid, 2-7 Sep 2007.-- PACS: 43.35.Cg. The natural stone industry plays an important role in construction sector activity, and due to this fact the accurate knowledge of the physico-mechanical properties of this kind of materials is indispensable for the configuration of t...
Article
The industry of ornamental rocks, such as granites, represents one of the most important industrial activities in the region of Extremadura, SW Spain. A detailed knowledge of the intrinsic properties of this natural stone and its environmental evolution is a required goal in order to fully characterize its quality. In this work, two independent NDT...
Article
Full-text available
En Extremadura existen unas 112 explotaciones de piedra natural, de las cuales 107 son de granitos, 2 de mármoles y 3 de pizarras. Destacan también las 34 plantas de transformación existentes, que producen al año 1,3 millones de m2 de tablero de granito y mármol y 19.000 toneladas de pizarra elaborada, lo que supone un valor de 63,3 millones de eur...
Conference Paper
Full-text available
Ornamental rocks, and particularly granites, represent one of the most important industrial activities in the region of Extremadura (SW Spain). Therefore, knowledge about the intrinsic properties of this natural material and its evolution in the environment is required in order to ensure the quality of construction activities based on these types o...
Article
Full-text available
Stable isotopes of carbon are studied in atmosphere, freshwater (rivers) and groundwater of the region of Madrid. Sampling and analytical techniques are adapted for the isotopic study of carbon in the environment. The atmosphere samples show C13 values from -13.92 to -15.67º/oo, closely related to the polution level of air. The water from wells, to...
Article
The atmosphere samples show δ13C values from -13.92 to -15.67‰, closely related to the pollution level of air. The water from wells, to the Tertiary detritic aquifer, with δ13C among -13.92 and -15.67‰. The dissolution of carbonatic rocks and the biologic activity could be the origin of the wide variations δ13C from -7.07 to -11.85‰) found in the w...

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Projects

Projects (4)
Project
Geolodia's guides in Cáceres and Badajoz provinces, Extremadura region (Spain)