Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Basque Country University researcher studies atom to atom cement

09.02.2010
The PhD thesis by Mr Hegoi Manzano Moro at the University of the Basque Country (UPV/EHU), entitled Atomistic simulation studies of cement components, aimed to provide an answer to these questions and to understand the properties and characteristics of the components of the material.

When cement powder is mixed with water, a series of complex chemical reactions and physical changes takes place. The final result – cement paste – is a complex, multi-component material with a variable and porous composition. Cement is, moreover, a “live” material – throughout its life, even dozens of years after hardening, its structure continues evolving, undergoing physical and chemical changes.

Amongst the different components of the cement matrix, the most important is undoubtedly that known as C-S-H gel. C-S-H gel, acronym for calcium silicate hydrate, represents 70% of the matrix and is mainly responsible for the cohesion and mechanical properties of the material. Nevertheless, despite its importance, many aspects of the gel, including its exact composition, are still unknown.

Simulation at an atomic scale

The application of the atomistic simulation enabled Mr Manzano to understand the properties and characteristics of this gel. The atomistic simulation methods enable the properties and the behaviour of the materials to be studied at a level of the interactions amongst the atoms making them up. Knowledge of cement at an atomic scale will facilitate the design of modifications that will enhance performances and properties

After four years of research, Mr Manzano has found, amongst other things, that there is a clear relation between the mechanical properties of C-S-H gel and the internal structure of the nanoparticles that it is made of. C-S-H gel is made up of colloidal nanoparticles that aggregate in various ways in order to make the material. The manner in which these nanoparticles are ordered amongst each other is probable the factor that most influences the mechanical properties of the cement. The closer together they are and the less space between them there is, the more dense is the C-S-H gel and the better its mechanical properties. But this is not the only factor to be taken into account. The internal structure of each one of these particles also affects the total.

Each particle is formed by laminas of calcium oxide surrounded by chains of silicates of various lengths. We have shown that, the longer these silicate chains, the individual properties of each particle improve and, at the same time, the overall qualities of the C-S-H gel are improved. Based on these results, Mr Manzano concluded that the mechanical properties of the cement can be enhanced by 30% if, during its hydration, the formation of longer silicate chains and more compact C-S-H gels is boosted. An improvement of this magnitude would have great impact on the cement industry which, in 2008, produced almost 3,000 million tons of cement. An enhancement of 30% in the mechanical properties implies approximately 30% less cement in order to achieve the same resistance in a building. Thus, the production of cement is reduced and, as a consequence, emissions of CO2 to the atmosphere likewise.

Despite the research already carried out, there are still many aspects of cement to be studied, in order to achieve improvements in the material that will have an impact on a sector as important as construction.

Amaia Portugal | alfa
Further information:
http://www.basqueresearch.com/berria_irakurri.asp?Berri_Kod=2552&hizk=I

More articles from Materials Sciences:

nachricht Argon is not the 'dope' for metallic hydrogen
24.03.2017 | Carnegie Institution for Science

nachricht Researchers make flexible glass for tiny medical devices
24.03.2017 | Brigham Young University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Argon is not the 'dope' for metallic hydrogen

24.03.2017 | Materials Sciences

Astronomers find unexpected, dust-obscured star formation in distant galaxy

24.03.2017 | Physics and Astronomy

Gravitational wave kicks monster black hole out of galactic core

24.03.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>