Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Computer calculates when reinforced concrete will rust

21.03.2003


Dutch researchers have developed a computer model that calculates the rate at which salt and moisture penetrate reinforced concrete. The model can be used for both the design of new concrete structures as well as analysing the lifespan of existing ones.

Sander Meijers from Delft University of Technology studied the relationship between moisture transport and salt penetration in concrete. Concrete structures such as bridges and dams are designed with as long a lifespan as possible. If these structures are built in the sea or are exposed a lot to gritting salt then the reinforcement rods in the concrete eventually rust over the course of time. The consequences are damage and generally expensive repairs.

The researchers built a computer model that calculated how concrete responded to being exposed to salt and moisture. The model can process various external temperatures, humidities and salt concentrations. Furthermore, it can deal with so-called carbonate effects. These are changes in the chemical composition of the concrete that can result in different moisture characteristics.



The software developed can calculate a number of linked transport phenomena simultaneously. This means that reactions of concrete under various temperatures and degrees of humidity can be calculated.

Various studies were carried out to observe how salt penetrates concrete. For example, the researchers have used the model to show moisture transport in cement stone. Calculations have also been performed for concrete blocks submerged in seawater. In addition to this the researchers have studied how concrete responds to periodic exposure to salty water.

Meijers’ model and the associated software can be used for both the design of new concrete structures as well as the analysis of existing ones. With this it is possible to simulate how concrete is affected by various factors.

For further information please contact Dr Sander Meijers (Delft University of Technology, now working at Intron), tel +31 (0)345 585170, fax +31 (0)345 585171, e-mail: sme@intron.nl. The doctoral thesis was defended on 10 March 2003. Dr Meijers’ supervisors were Prof. J.M.J.M. Bijen and Prof. R. de Borst. An illustration of a damaged concrete bridge can be obtained from the Department of Information and Communication, Netherlands Organisation for Scientific Research (tel. +31 (0)70 344 0713, e-mail: voorlichting@nwo.nl).

The research was funded by the Technology Foundation STW.

Nalinie Moerlie | alfa
Further information:
http://www.nwo.nl

More articles from Process Engineering:

nachricht Intelligent wheelchairs, predictive prostheses
20.12.2017 | Fraunhofer-Institut für Produktionstechnik und Automatisierung IPA

nachricht Jelly with memory – predicting the leveling of com-mercial paints
15.12.2017 | Fraunhofer-Institut für Produktionstechnik und Automatisierung IPA

All articles from Process Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

Im Focus: Autonomous 3D scanner supports individual manufacturing processes

Let’s say the armrest is broken in your vintage car. As things stand, you would need a lot of luck and persistence to find the right spare part. But in the world of Industrie 4.0 and production with batch sizes of one, you can simply scan the armrest and print it out. This is made possible by the first ever 3D scanner capable of working autonomously and in real time. The autonomous scanning system will be on display at the Hannover Messe Preview on February 6 and at the Hannover Messe proper from April 23 to 27, 2018 (Hall 6, Booth A30).

Part of the charm of vintage cars is that they stopped making them long ago, so it is special when you do see one out on the roads. If something breaks or...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Fingerprints of quantum entanglement

16.02.2018 | Information Technology

'Living bandages': NUST MISIS scientists develop biocompatible anti-burn nanofibers

16.02.2018 | Health and Medicine

Hubble sees Neptune's mysterious shrinking storm

16.02.2018 | Physics and Astronomy

VideoLinks
Science & Research
Overview of more VideoLinks >>>