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Madrid, Spain

Nevshupa R.A.,CISDEM CSIC | Roman E.,CSIC - Institute of Materials Science | De Segovia J.L.,CSIC - Institute of Materials Science
Tribology International | Year: 2013

Mechanical elements may produce significant contamination of ultrahigh vacuum due to emission of gases from materials under stress and rubbing. Composition of emitted gases and behavior of gas emission was studied for various materials and surface coatings of interest for vacuum engineering. It is suggested that gases dissolved and occluded in the material bulk (H2 and Ar) and tribochemical reactions (CxHy) are the main sources of gas emission. Frictional heating was discarded as the driving force for gas emission. Mathematical apparatus of specific parameters for characterization of gas emission is proposed. © 2012 Elsevier Ltd. Source

Castillo A.,CISDEM CSIC | Andrade C.,CISDEM CSIC | Martinez I.,CISDEM CSIC | Rebolledo N.,CISDEM CSIC | And 4 more authors.
Informes de la Construccion | Year: 2011

Present paper describes some aspects of the restoration project recently undertaken in La Zarzuela Racecourse, designed by E. Torroja, Despite the good mechanical work of steel, it has started a deterioration process which has caused the reinforcement corrosion by carbonation. It has been detected corrosion attack in some places due the breaking of the upper waterproofing membrane of the shell and concrete carbonation. For the repair first an assessment of the degree of corrosion was made. The restoration project finally consisted in the injection of all the cracks in order to assure the joint work of the shell and the patching of the deteriorated zones. Profiting these works it was installed a monitoring system of corrosion sensors. We present the results of the application of electrochemical techniques, qualitative and quantitative measures used for assessing the residual service life of concrete structures and monitoring, where real Zarzuela Racecourse. Source

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