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Primeur weekly 2016-10-10

Exascale supercomputing

The incredible shrinking particle accelerator ...

Brookhaven Lab to play major role in 2 DOE exascale computing application projects ...

Quantum computing

More stable qubits in perfectly normal silicon ...

Focus on Europe

RSC supercomputers go West ...

Hardware

Allinea tools play vital role in advancing computational research at the VSC, Austria's largest HPC facility ...

Smallest transistor ever ...

Turning to the brain to reboot computing ...

Complex materials can self-organize into circuits, may form basis for multifunction chips ...

Wireless data centre on a chip aims to cut energy use ...

Adapteva announces 28nm 64-core Epiphany-IV microprocessor chip ...

SGI introduces unique scale-out solution for SAP HANA that protects investments when moving to real-time business ...

Applications

Clemson University scientists receive $1.8 million grant to combat Type 2 diabetes ...

Climate change intensifies night-time storms over Lake Victoria ...

Computer simulations explore how Alzheimer's disease starts ...

Rice University lab explores cement's crystalline nature to boost concrete performance ...

Rice University researchers say 2D boron may be best for flexible electronics ...

Large animals, such as the imperious African elephant, most vulnerable to impact of human expansion ...

Computer simulation finds dangerous molecule activity for ageing ...

Tornadogenesis ...

As hurricane heads up coast, a RENCI supercomputer swings into action ...

New drug candidate may reduce deficits in Parkinson's disease ...

XSEDE allocations awarded to 155 research teams across U.S. ...

OSC part of NSF-funded consortium for advancing research computing practices ...

NCSA awarded NSF grant to expand computational science education in food, energy, and water ...

Crosstalk analysis of biological networks for improved pathway annotation ...

The Cloud

Nimbix collaborates with IBM and NVIDIA to launch powerful GPU Cloud offering ...

Rice University lab explores cement's crystalline nature to boost concrete performance


This is a close-up view of an edge dislocation defect in a cement crystal simulation by scientists at Rice University. They analyzed the crystalline structure of calcium silicates used in cement to maximize the ability to fine-tune the material. Credit: Lei Tao/Multiscale Materials Laboratory.
3 Oct 2016 Houston - Rice University scientists analyze the crystalline structure of calcium silicates used in cement to maximize the ability to fine-tune the material. The work could help conserve energy and cut carbon emissions. Rice University scientists working to develop a deeper understanding of the world's most widely used man-made material, concrete, have detailed previously unexplored aspects that affect the energy required to make it and the greenhouse gases released.

The Rice laboratory of materials scientist Rouzbeh Shahsavari developed techniques to not only analyze but also see dislocations in dicalcium silicates - also known as belite, a component of Portland cement, and detailed how each of five distinct types contributes to concrete's ease of manufacture and ultimate strength.

"Though belite is crystalline in nature, the crystals are so small and the material so amorphous that nobody has looked at them with the kind of analytical eye they deserve", Rouzbeh Shahsavari stated. But fine-tuning them for use in the cement that holds concrete together can help save energy, which in turn leads to a reduction in carbon emissions, he said.

"Putting an atomistic lens on the role of defects on the mechanics and water reactivity of belite crystals can provide new insights on how to modulate the grinding energy of cement clinkers and strength development of concrete", he stated. "Both of these factors can significantly contribute to energy saving and reduced environmental footprints due to the use and manufacture of concrete."

Calcium silicates are a key ingredient in industrial clinkers, which are ground and mixed with water to make cement. Compared with tricalcium silicate, the more dominant ingredient in cement, belite can be produced at a much lower temperature. This temperature is at least 100 degrees Celsius (212 degrees Fahrenheit) lower and makes belite an economical trade; however, it is harder to grind and reacts more slowly with water, which leads to delayed strength development in cement paste. Rouzbeh Shahsavari said these issues have curbed the widespread use of belite-based cement in concrete, but his lab has adopted an approach that could bring change.

Belite crystals of calcium, silicon and oxygen mainly take one of two different forms, either monoclinic or orthorhombic, each of which behaves differently at the atomic level. Rice researchers subdivided those into five distinct polymorphic crystals. Through computer simulations and high-resolution electron microscopy, they determined one of the monoclinic forms, dubbed beta-C2S, is the most brittle and possibly the best-suited for cements requiring low-energy manufacture.

Rouzbeh Shahsavari said the research provides new insight about the bottom-up engineering of materials that have the properties of cement. "The physical understanding gained by our high-resolution electron microscopy images, the first of their kind for cement, combined with our atomistic-level computations, can put cement-based materials on equal footing with metallic systems and semiconductors in the emerging application of 'defect-engineering' to boost performance in manufacturability and functionality", he stated. "We expect this will lead to energy savings and environmental benefits."

The lab's report appears in Cement and Concrete Research . Co-authors of the paper are Rice alumna Lu Chen, now a structural engineer at Arup, and graduate student Lei Tao.

The National Science Foundation supported the research. Supercomputers utilized in the research included the NSF-supported DAVinCI supercomputer, administered by Rice's Center for Research Computing and procured in a partnership with Rice's Ken Kennedy Institute for Information Technology, and resources supported by the National Institutes of Health, IBM, Cisco, Qlogic and Adaptive Computing.

Source: Rice University

Back to Table of contents

Primeur weekly 2016-10-10

Exascale supercomputing

The incredible shrinking particle accelerator ...

Brookhaven Lab to play major role in 2 DOE exascale computing application projects ...

Quantum computing

More stable qubits in perfectly normal silicon ...

Focus on Europe

RSC supercomputers go West ...

Hardware

Allinea tools play vital role in advancing computational research at the VSC, Austria's largest HPC facility ...

Smallest transistor ever ...

Turning to the brain to reboot computing ...

Complex materials can self-organize into circuits, may form basis for multifunction chips ...

Wireless data centre on a chip aims to cut energy use ...

Adapteva announces 28nm 64-core Epiphany-IV microprocessor chip ...

SGI introduces unique scale-out solution for SAP HANA that protects investments when moving to real-time business ...

Applications

Clemson University scientists receive $1.8 million grant to combat Type 2 diabetes ...

Climate change intensifies night-time storms over Lake Victoria ...

Computer simulations explore how Alzheimer's disease starts ...

Rice University lab explores cement's crystalline nature to boost concrete performance ...

Rice University researchers say 2D boron may be best for flexible electronics ...

Large animals, such as the imperious African elephant, most vulnerable to impact of human expansion ...

Computer simulation finds dangerous molecule activity for ageing ...

Tornadogenesis ...

As hurricane heads up coast, a RENCI supercomputer swings into action ...

New drug candidate may reduce deficits in Parkinson's disease ...

XSEDE allocations awarded to 155 research teams across U.S. ...

OSC part of NSF-funded consortium for advancing research computing practices ...

NCSA awarded NSF grant to expand computational science education in food, energy, and water ...

Crosstalk analysis of biological networks for improved pathway annotation ...

The Cloud

Nimbix collaborates with IBM and NVIDIA to launch powerful GPU Cloud offering ...