Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Environmentally friendly cement is stronger than ordinary cement

The IRIS instrument is viewed from above. The cement sample is lowered about 120 cm into a cryostat so that it is hit by the neutron beam. The cryostat is emptied of air to avoid signal noise from air.

Credit: Johan Jacobsen, Niels Bohr Institute
The IRIS instrument is viewed from above. The cement sample is lowered about 120 cm into a cryostat so that it is hit by the neutron beam. The cryostat is emptied of air to avoid signal noise from air.

Credit: Johan Jacobsen, Niels Bohr Institute

Abstract:
New research from the Niels Bohr Institute shows that cement made with waste ash from sugar production is stronger than ordinary cement. The research shows that the ash helps to bind water in the cement so that it is stronger, can withstand higher pressure and crumbles less. At the same time, energy is saved and pollution from cement production is reduced. The results are published in the scientific journal, Scientific Reports.

Environmentally friendly cement is stronger than ordinary cement

Copenhagen, Denmark | Posted on September 16th, 2013

Cement is comprised of chalk and clay, which are mixed together and heated at high temperatures in a cement kiln. The mixture is then crushed into a powder. When the cement powder is mixed with water a chemical process takes place, which causes the cement mixture to harden. Cement is used as a building material throughout the world.

In some countries where sugar cane is grown, agricultural waste product from sugar production has been added to the cement mixture for many years. Once the sugar has been extracted from the sugar can you are left with a lot of fibre waste, which is used as fuel for energy production. From the energy production you get a lot of ash, which needs to be disposed of. In some countries, like Cuba and Brazil, the ash is added into cement mixtures.

"I have been studying cement using quasi-elastic neutron scattering for several years and researchers from Brazil asked whether I wanted to analyse samples of cement mixed with waste products in the form of sugar cane ash. I decided to say yes to the project, which aimed to investigate the properties on a nano-scale and map the mobility of water in the cement. The quality and strength of cement is directly related to how much of the water is chemically bonded. The more the water can move around, the worse it is for the strength and durability," explains Heloisa Bordallo, who does research in nanophysics at the Niels Bohr Institute at the University of Copenhagen.

Neutron scattering reveals water

Heloisa Bordallo was sent a number of cement samples from Brazil. The samples contained varying amounts of ash from sugar can production. Their innermost dynamics were then examined. This took place at the ISIS facility in the UK. The samples were placed in an instrument where they were bombarded by neutrons.

"Using neutron scattering, we can see how the water inside the sample moves. Neutrons are shot into the sample and when neutrons hit the water's hydrogen atoms, they interact and the neutrons scatter and are picked up by the detectors. We repeat this for several hours and by analysing the data we can determine how the water inside the sample is moving and also determine its local environment," explains Johan Jacobsen, who performed the experiments as part of his thesis for the graduate programme in physics at the Niels Bohr Institute.

The experiments showed that the cement mixed with approx. 20 percent ash had good properties. The water the cement pores was bound to the ash and moved around less. This explains why the ash cement is stronger, can withstand higher pressure and will crumble less.

Potential for environmentally friendly ash cement

Cement typically takes a week to solidify. After one month, 70 percent of the process has been completed, but the process continues for many years. Ordinary cement is generally stronger during the first few months than the ash cement, but after a year the ash cement is stronger than the ordinary cement.

Ash cement has been used for many years, but only locally. Now it could have great potential.

"The cement industry is huge and if they are to adopt a new idea, they need to have proof that it works. Using quasi-elastic neutron scattering we have now studied cement mixed with ash and shown what is happening and why it is stronger. Cement production uses a lot of energy and emits large amounts of CO2, because it needs to be heated up to very high temperatures. Cement production accounts for 5 percent of global CO2 emissions. If you replace 20 percent of the content with ash, you are saving both CO2 emissions and raw materials, as you use 20 percent less by utilizing a waste product like ash," says Heloisa Bordallo.

####

For more information, please click here

Contacts:
Gertie Skaarup

45-35-32-53-20

Heloisa N. Bordallo
Associate Professor
Niels Bohr Institute
University of Copenhagen
+45 2130-8829

http://www.nbi.ku.dk/english/

Copyright © University of Copenhagen - Niels Bohr Institute

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Article in Scientific Reports:

Related News Press

News and information

ANU invention to inspire new night-vision specs December 7th, 2016

Arrowhead Pharmaceuticals to Webcast Fiscal 2016 Year End Results December 7th, 2016

Journal Nanotechnology Progress International (JONPI), newest edition out December 7th, 2016

In IEDM 2016 Keynote, Leti CEO Says ‘Hyperconnectivity’, Human-focused Research and the IOT Promise Profound, Positive Changes December 7th, 2016

Discoveries

ANU invention to inspire new night-vision specs December 7th, 2016

Leti IEDM 2016 Paper Clarifies Correlation between Endurance, Window Margin and Retention in RRAM for First Time: Paper Presented at IEDM 2016 Offers Ways to Reconcile High-cycling Requirements and Instability at High Temperatures in Resistive RAM December 6th, 2016

Tokyo Institute of Technology research: 3D solutions to energy savings in silicon power transistors December 6th, 2016

Physicists decipher electronic properties of materials in work that may change transistors December 6th, 2016

Materials/Metamaterials

Physicists decipher electronic properties of materials in work that may change transistors December 6th, 2016

Infrared instrumentation leader secures exclusive use of Vantablack coating December 5th, 2016

Construction of practical quantum computers radically simplified: Scientists invent ground-breaking new method that puts quantum computers within reach December 5th, 2016

Inside tiny tubes, water turns solid when it should be boiling: MIT researchers discover astonishing behavior of water confined in carbon nanotubes November 30th, 2016

Announcements

ANU invention to inspire new night-vision specs December 7th, 2016

Arrowhead Pharmaceuticals to Webcast Fiscal 2016 Year End Results December 7th, 2016

Journal Nanotechnology Progress International (JONPI), newest edition out December 7th, 2016

In IEDM 2016 Keynote, Leti CEO Says ‘Hyperconnectivity’, Human-focused Research and the IOT Promise Profound, Positive Changes December 7th, 2016

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

ANU invention to inspire new night-vision specs December 7th, 2016

Journal Nanotechnology Progress International (JONPI), newest edition out December 7th, 2016

Tokyo Institute of Technology research: 3D solutions to energy savings in silicon power transistors December 6th, 2016

Physicists decipher electronic properties of materials in work that may change transistors December 6th, 2016

Tools

Deep insights from surface reactions: Researchers use Stampede supercomputer to study new chemical sensing methods, desalination and bacterial energy production December 2nd, 2016

Controlled electron pulses November 30th, 2016

Scientists shrink electron gun to matchbox size: Terahertz technology has the potential to enable new applications November 25th, 2016

News from Quorum: The Agricultural Research Service of the USDA uses a Quorum Cryo-SEM preparation system for the study of mites, ticks and other soft bodied organisms November 22nd, 2016

Environment

Semiconductor-free microelectronics are now possible, thanks to metamaterials November 9th, 2016

First time physicists observed and quantified tiny nanoparticle crossing lipid membrane November 7th, 2016

Nanosensors on the alert for terrorist threats: Scientists interested in the prospects of gas sensors based on binary metal oxide nanocomposites November 5th, 2016

Marsden minds: Amazing projects revealed November 3rd, 2016

Construction

Diamond nanothread: Versatile new material could prove priceless for manufacturing: Would you dress in diamond nanothreads? It's not as far-fetched as you might think November 3rd, 2016

DryWired's Liquid Nanotint to be the first nano-insulation in a Federal building: 250,000 federal buildings, most with uninsulated glass October 12th, 2016

New flexible material can make any window 'smart' August 23rd, 2016

Cement design should take into account the water confined in the smallest pores: A researcher at the UPV/EHU-University of the Basque Country is participating in the study of the stresses of confined water in the micropores of cement at extreme temperatures August 11th, 2016

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project