Application of electrical fields to reduce chloride ingress into concrete structures

2021 ◽  
pp. 1-27
Author(s):  
Carla Driessen-Ohlenforst ◽  
Michael Raupach
Keyword(s):  
Chloride Ions ◽  
Chloride Ingress ◽  
Textile Reinforced Concrete ◽  
Electrical Field ◽  
Joint Research ◽  
Electrical Fields ◽  
Joint Research Project ◽  
Anodic Polarisation ◽  
Current Densities ◽  
Field Strengths

In the context of a joint research project, a system for monitoring, protection and strengthening of bridges by using a textile reinforced concrete interlayer has been developed which consists of two carbon layers with a spacing of 15 mm and a special mortar. This setup led to the idea to build up an electrical field between the carbon meshes, which suppresses the ingress of chlorides into the concrete. This paper focuses on the question which voltages and electrical field strengths are necessary to prevent critical chloride contents at the reinforcing steel. For this purpose, extensive laboratory tests have been performed, followed by a numerical simulation study. By applying an electrical field, the negatively charged chloride ions are forced to move to the upper carbon mesh that is polarized as an anode. It has been investigated whether the voltages to implement an electrochemical chloride barrier are smaller than they have to be for the common preventive cathodic protection. One advantage of this chloride barrier is that because of the lower current densities the anodic polarisation of the carbon meshes can be reduced. Therefore, different voltages, electrical field strengths, anode materials and anode arrangements were investigated.

scholarly journals Investigations on the detectability of water intruding into bridge deck sealings by electrical resistivity measurements

2018 ◽  
Vol 199 ◽  
pp. 06005
Author(s):  
Carla Driessen ◽  
Michael Raupach
Keyword(s):  
Bridge Deck ◽  
Early Stage ◽  
Climatic Conditions ◽  
Textile Reinforced Concrete ◽  
Joint Research ◽  
Resistivity Measurements ◽  
Joint Research Project ◽  
Measuring Field ◽  
Measured Resistivity ◽  
A Current

In the context of a current joint research project a monitoring system to detect leakages in bridges is implemented by using a textile reinforced concrete interlayer which consists of two carbon meshes with a spacing of 15 mm and a new developed mortar. Between the two carbon meshes the resistivity is measured with alternating current. If a leakage in the bridge deck sealing occurs and water gets into the interlayer a drop in the measured resistivity occurs and the leakage is detected. In this case repair measures can be carried out in an early stage or a preventive cathodic protection can be switched on. To assess which sizes of leakages are detectable under which boundary conditions, laboratory tests and tests on a 100 m2 outdoor demonstrator were carried out. Therefore leakages were artificially produced and the changes in the measured resistivity values were observed under different climatic conditions. Impacts such as the form of the leakages or the position of the leakages in the measuring field were varied.

scholarly journals AFX Zeolite for Use as a Support of NH3-SCR Catalyst Mining through AICE Joint Research Project of Industries–Academia–Academia

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 163
Author(s):  
Masaru Ogura ◽  
Yumiko Shimada ◽  
Takeshi Ohnishi ◽  
Naoto Nakazawa ◽  
Yoshihiro Kubota ◽  
...  
Keyword(s):  
High Performance ◽  
Ionic Species ◽  
Research Project ◽  
Joint Research ◽  
Structure Directing Agent ◽  
Scr Catalyst ◽  
Organic Structure ◽  
Nh3 Scr ◽  
Joint Research Project ◽  
The One

This paper introduces a joint industries–academia–academia research project started by researchers in several automobile companies and universities working on a single theme. Our first target was to find a zeolite for NH3-SCR, that is, zeolite mining. Zeolite AFX, having the same topology of SSZ-16, was found to be the one of the zeolites. SSZ-16 can be synthesized by using an organic structure-directing agent such as 1,1′-tetramethylenebis(1-azonia-4-azabicyclo[2.2.2]octane; Dab-4, resulting in the formation of Al-rich SSZ-16 with Si/Al below five. We found that AFX crystallized by use of N,N,N′,N′-tetraethylbicyclo[2.2.2]oct-7-ene-2,3:5,6-dipyrrolidinium ion, called TEBOP in this study, had the same analog as SSZ-16 having Si/Al around six and a smaller particle size than SSZ-16. The AFX demonstrated a high performance for NH3-SCR as the zeolitic support to load a large number of divalent Cu ionic species with high hydrothermal stability.

scholarly journals What sparks academic engagement with society? A comparison of incentives appealing to motives

2021 ◽  
pp. 095042222199406
Author(s):  
Eva Sormani ◽  
Thomas Baaken ◽  
Peter van der Sijde
Keyword(s):  
Higher Education ◽  
Academic Engagement ◽  
Career Advancement ◽  
Self Determination Theory ◽  
Self Determination ◽  
Third Mission ◽  
Research Support ◽  
Joint Research ◽  
Subject Design ◽  
Joint Research Project

The pressure on higher education institutions (HEIs) to realize third mission activities continues to grow, intensifying the search for incentives to motivate academics to engage with stakeholders outside their HEI. Previous studies have found limitations in intrinsically motivating academic engagement; therefore, this study investigates the extrinsic regulation of motivations via incentives. The authors identified a broad range of incentives for third mission activities, belonging to four motivation categories: pecuniary incentives, career advancement, appreciation and research support. Drawing on self-determination theory, incentives (nudges and rewards) are empirically compared in a between-subject design with a sample of 324 academics from the business and economics disciplines. The analysis showed that nudges affect business and economics academics’ intention to engage with society in a joint research project. Furthermore, these academics responded well to incentives concerned with the research support motivation category. The findings contribute to the literature by highlighting the relevance of marginal incentives—nudges—in implementing appropriate incentives in HEIs.

Corporate Finance in Germany and France. A Joint Research Project of the Deutsche Bundesbank and the Banque de France

1999 ◽  
Author(s):  
Hans Friderichs ◽  
Dieter Gerdesmeier ◽  
Elisabeth M. Kremp ◽  
Bernard Paranque ◽  
Annie Sauve ◽  
...  
Keyword(s):  
Corporate Finance ◽  
Research Project ◽  
Joint Research ◽  
Joint Research Project ◽  
Deutsche Bundesbank

Effects of Stress and Plastic Deformation on the Corrosion of Steel

CORROSION ◽  
1970 ◽  
Vol 26 (5) ◽  
pp. 189-199 ◽  
Author(s):  
W. D. FRANCE
Keyword(s):  
Plastic Deformation ◽  
Electrochemical Techniques ◽  
Chloride Ions ◽  
Localized Corrosion ◽  
Dissolution Behavior ◽  
Potential Range ◽  
Chemical Corrosion ◽  
Effects Of Ph ◽  
Current Densities ◽  
The Stability

Abstract The rate and type of corrosion exhibited by mild steel in the annealed, stressed, and plastically deformed state have been investigated. Precise electrochemical techniques provided potential and polarization data to supplement the results of chemical corrosion tests. Experiments were conducted in 0.6M NH4NO3 solutions in which steel exhibits active-passive dissolution behavior as well as localized corrosion. At active potentials, the anodic polarization curves for annealed and deformed specimens were nearly identical, with only slight increases in current densities for the deformed steel. Results at passive potentials demonstrated that increased plastic deformation can markedly decrease the passive potential range, the stability of passivity, and the ability to passivate. At certain passive potentials, the deformed steel exhibited current densities that were 400 times greater than those for annealed steel. The effects of pH, chloride ions, and crevices on the corrosion of deformed steel were examined in detail. The differences between the dissolution behavior of annealed and deformed steel were most distinctive in the approximate pH range of 3 to 6. This work is relevant to the understanding of the initiation of localized corrosion and to anodic protection.

Backbone for Escape, Evacuation and Rescue From Arctic Facilities: A Systematic Approach

2014 ◽  
Author(s):  
Mark Longrée ◽  
Sven Hoog
Keyword(s):  
Energy Demand ◽  
Oil And Gas ◽  
Tourism Industry ◽  
The Arctic ◽  
Joint Research ◽  
Operating Personnel ◽  
Gas Industry ◽  
Joint Research Project ◽  
Arctic Ice ◽  
The Impact

In turn of the global warming and driven by the constant need for resources an increasing number of commercial and scientific activities conquer the Arctic in order to benefit from almost untouched resources like oil and gas but also from the overwhelming nature. These activities are accompanied by a steadily increasing number of vessels transporting goods but also operating personnel, scientists or tourists. Especially the number of tourists visiting the Arctic can reach far more than 1000 per vessel, resulting in growing headaches for the responsible safety and security authorities in the Arctic surrounding countries. Up to now no suitable Escape, Evacuation and Rescue (EER) concept is in place to cope with these challenges when it comes to hazardous situations. In this context IMPaC ([1]) developed a new and appropriate EER concept for the Arctic, exceeding the currently dominant small and isolated settlements along the coastlines in Denmark (Greenland), Norway, Russia, Canada and the US. One question seems to be central: Is there any requirement and benefit beyond the currently used small rescue station? Yes, we strongly believe that there is a growing demand for suitable infrastructure coming from various industries. Beyond rescue objectives there is a demand for people working and living in this area all year long, for a few days, weeks or months using these settlements for their specific needs. This led us to the idea of the provision of a common-use infrastructure for multiple industries. The commonly used infrastructure maximizes the use of the remote and very expensive infrastructure and minimizes the impact on the environment in this part of the world. Potential users of this infrastructure would be: • Oil & Gas Industry, driven by the increased world energy demand • Marine Transport & Tourism Industry, driven by declined arctic ice and new sea routes via the Arctic sea • Fishery Industry • Scientific community Any EER concept for the Arctic has to cope with several specific environmental and spatial challenges as addressed by the EU joint research project ACCESS ([2]), where IMPaC participates. The paper introduces the new EER concept and focuses especially on its beneficial, efficient and safe operability in the Arctic recording an increasing number of commercial and scientific activities.

Migration to the Gulf States and China: Local Perspectives from Cameroon

2009 ◽  
Vol 2 (2) ◽  
pp. 229-244 ◽  
Author(s):  
Peter Tatah ◽  
Michaela Pelican
Keyword(s):  
International Migration ◽  
Far East ◽  
African Countries ◽  
Joint Research ◽  
Migration Internationale ◽  
Joint Research Project ◽  
The Family ◽  
Gulf States ◽  
Majeure Partie ◽  
Local Perspectives

Abstract This contribution discusses local perspectives on international migration with a focus on South-South and South-East migration, namely from Cameroon to the Gulf States and to China. The report is based on a joint research project involving anthropologists and students of the Universities of Zurich, Yaoundé and Douala. As in many African countries, international migration has become a major concern for large parts of the population of Cameroon. While western countries still feature as preferred destinations, many Cameroonians have turned to other, more easily accessible options within the South. Popular destinations are countries within Africa as well as the Near and Far East. In all these migration enterprises the family plays a crucial role, both in the preparation of the journey and with regard to transnational exchange relations. For Muslim migrants, religion may be a significant factor influencing their choice of destination besides other considerations, such as economic and educational incentives. Cette contribution examine les perspectives locales sur la migration internationale avec un accent sur la migration Sud-Sud et sur la migration Sud-Est, à savoir du Cameroun aux Etats du Golfe et à la Chine. Le rapport est basé sur un projet de recherche impliquant des anthropologues et des étudiants des universités de Zurich, Yaoundé et Douala. Comme dans beaucoup de pays africains, la migration internationale est devenue un souci majeur pour la majeure partie de la population camerounaise. Tandis que les pays occidentaux figurent toujours comme les destinations préférées, beaucoup de Camerounais se tournent vers des pays plus accessibles dans le Sud. Les destinations populaires sont les pays africains et l'Extrême et Proche Orient. Dans toutes ces stratégies de migration la famille joue un rôle crucial, tant dans la préparation du voyage qu'en ce qui concerne les relations d'échange transnationales. Pour les migrants musulmans, la religion peut être un facteur significatif influençant le choix de la destination en plus d'autres considérations, comme des motivations économiques et éducatives.

The Mooring Bay Concept for LNG Loading in Harsh and Ice Conditions

2012 ◽  
Author(s):  
Sven Hoog ◽  
Joachim Berger ◽  
Johannes Myland ◽  
Günther F. Clauss ◽  
Daniel Testa ◽  
...  
Keyword(s):  
Natural Gas ◽  
Model Tests ◽  
The Arctic ◽  
Transfer System ◽  
Research Project ◽  
Joint Research ◽  
Gas Treatment ◽  
Ice Coverage ◽  
Joint Research Project ◽  
Flexible Transfer Lines

The demand for natural gas from offshore fields is continuously increasing. Especially future production from Arctic waters comes into focus in context with global warming effects leading to the development of a dedicated technology. Relevant approaches work with floating turret moored production terminals (FLNG) receiving gas via flexible risers from subsea or onshore fields. These terminals provide on-board gas treatment and liquefaction facilities as well as huge storage capabilities for LNG (Liquefied Natural Gas), LPG (Liquefied Petrol Gases) and condensate. Products are transferred to periodically operating shuttle tankers for onshore supply reducing the need for local onshore processing plants providing increased production flexibility (future movability or adaptation of capacity). Nevertheless, in case of harsh environmental conditions or ice coverage the offshore transfer of cryogenic liquids between the terminal and the tankers becomes a major challenge. In the framework of the joint research project MPLS20 ([1]), an innovative offshore mooring and cargo transfer system has been developed and analyzed. MPLS20 is developed by the project partners Nexans ([2]) and Brugg ([3]), leading manufacturers of vacuum insulated, flexible cryogenic transfer pipes, IMPaC ([4]), an innovative engineering company that has been involved in many projects for the international oil and gas industry for more than 25 years and the Technical University (TU) Berlin, Department of Land- and Sea Transportation Systems (NAOE, [5]), with great expertise in numerical analyses and model tests. The overall system is based on IMPaC’s patented and certified offshore ‘Mooring Bay’ concept allowing mooring of the vessels in tandem configuration and simultaneous handling and operation of up to six flexible transfer pipes in full aerial mode. The concept is outlined to operate with flexible transfer lines with 16-inch inner diameter like the newly designed and certified corrugated pipes from Nexans and Brugg. The mooring concept and its major subsystems have proven their operability by means of extensive numerical analysis, model tests and a professional ship handling simulator resulting in an overall transfer solution suitable to be used especially under Arctic conditions like addressed by the EU joint research project ACCESS (http://access-eu.org/). The paper introduces the new offshore LNG transfer system and focuses especially on its safe and reliable operability in the Arctic — with ice coverage as well as in open water conditions.

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