Publication: Petrofísica y durabilidad de las anfibolitas de Touro
(A Coruña, España) para su uso en obra civil
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2013-07
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Instituto Geológico y Minero de España
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Abstract
En la actualidad, las anfibolitas de Touro (A Coruña, España) son explotadas para ser utilizadas regionalmente como áridos de machaqueo para su uso en obra civil, principalmente como materiales de préstamo o en carreteras, por lo que se ha considerado interesante profundizar en el conocimiento de las propiedades petrofísicas de esta variedad pétrea, así como en sus variaciones para poder evaluar su grado de calidad y durabilidad, antes de fijar su uso como árido. La obtención de esta información sobre la anfibolita de Touro se hace necesaria al no existir documentación accesible. Las anfibolitas de Touro son una variedad pétrea de gran calidad, debido a que su textura cristalina condiciona la presencia de una porosidad escasa y un alto grado de compacidad. Además, también son materiales
de gran durabilidad frente a la acción combinada del agua, el NaCl y las temperaturas extremas (condiciones frecuentes en la mayoría de las carreteras de montaña y del norte peninsular), aunque pueden verse afectadas superficialmente por la acción física de las bajas temperaturas, en presencia del agua y el NaCl, lo que se traduce en la aparición de una importante red de fisuras intercristalinas. Este estudio demuestra que las anfibolitas Touro son materiales buenos para la construcción de carreteras, pero es importante controlar su grado de anisotropía y el contenido en sulfuros
Nowadays, Touro amphibolites (La Coruña, Spain) are exploited as crushed-rock aggregates in civil engineering. These materials are mainly used as ballast for road construction. Therefore, it is interesting to study these materials in function of several parameters obtained directly in quarry faces. For this purpose, the same techniques and tests previously applied in other fields such as natural stone have been used. The aim of this work is to study the quality and durability of Touro amphibolites when subjected to extreme temperature, water and salt (NaCl) actions. The NaCl is included in this study because it is commonly used as fluxing material in pavements and roads. The quality of these amphibolites, a classification based on the concrete and road tests and the techniques applied, is good. The best properties of these materials are their low porosity and high ability to compact. They also have a high durability under the action of extreme temperatures, salts and water. These results also indicate that these amphibolites can better support high temperature rather than low temperature degradation. To sum up, we can state that Touro amphibolites are good building materials for roads and concrete but it is important to consider their anisotropy and sulphur content.
Nowadays, Touro amphibolites (La Coruña, Spain) are exploited as crushed-rock aggregates in civil engineering. These materials are mainly used as ballast for road construction. Therefore, it is interesting to study these materials in function of several parameters obtained directly in quarry faces. For this purpose, the same techniques and tests previously applied in other fields such as natural stone have been used. The aim of this work is to study the quality and durability of Touro amphibolites when subjected to extreme temperature, water and salt (NaCl) actions. The NaCl is included in this study because it is commonly used as fluxing material in pavements and roads. The quality of these amphibolites, a classification based on the concrete and road tests and the techniques applied, is good. The best properties of these materials are their low porosity and high ability to compact. They also have a high durability under the action of extreme temperatures, salts and water. These results also indicate that these amphibolites can better support high temperature rather than low temperature degradation. To sum up, we can state that Touro amphibolites are good building materials for roads and concrete but it is important to consider their anisotropy and sulphur content.