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Ancient glass-glued walls studied for nuke waste solutions

WSU researchers aim to see how glass changes over time

Date:
April 26, 2016
Source:
Washington State University
Summary:
The modern challenge of nuclear waste storage and disposal has researchers looking back at ancient materials from around the world.
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A sample of a fused Broborg hill-fort glass overlaid with cross-sectional X-ray tomography data. This non-destructive technique lets scientists image key internal portions of the sample.
Credit: Washington State University photo

The modern challenge of nuclear waste storage and disposal has researchers at Washington State University looking back at ancient materials from around the world.

They report on their work studying ancient glass and rock defense walls in a paper published in the May issue of American Ceramic Society Bulletin.

At the Hanford nuclear site in eastern Washington, the U.S. Department of Energy (DOE) is building the world's largest radioactive waste treatment plant for cleanup of 56 million gallons of radioactive and chemical waste. Researchers want to convert the waste, held in underground storage tanks, into durable glass that can be stored for thousands of years.

But they need to improve their understanding of how that glass would corrode, perform and alter over such a long time.

Technique 'like nowhere else in the world.'

Led by Jamie Weaver, a WSU doctoral student in chemistry, the researchers are studying materials from the mysterious Broborg hill-fort in Sweden, where a tribe of people around 1,500 years ago melted rocks to strengthen fortifications against invaders. They piled boulders left by ancient glaciers into two large rings, put black amphibolite rocks on top, layered the wall with charcoal and burned it. As the rock melted, it infiltrated the boulders and cooled as glass, acting as glue for the wall.

"The technique is like nowhere else in the world," said John McCloy, associate professor in the WSU School of Mechanical and Materials Engineering and co-author on the paper. "They heated the rock until it melted -- and it is still quite intact 1,500 years later.''

The Broborg site is valuable because researchers know what happened to the glass, how old it is and how it has worn. This can help them improve their models for long-term environmental protection, he said: "We need relevant timescales.''

The project is led by the DOE's Office of River Protection (ORP), which is developing a testing protocol for nuclear glass to meet U.S. Environmental Protection Agency disposal regulations.

Pre-technology expertise inspiring

Weaver, an intern at DOE's Pacific Northwest National Laboratory (PNNL), said she has gained appreciation of the ancient people and their techniques as she has studied them.

"Without electricity and all the technology that we have today, they did some really cool work,'' she said. "It's pretty awesome how smart and creative they were.''

The work is supported through DOE environmental management and is a collaboration between the National Historical Museums and Luleå University in Sweden, PNNL, WSU and the Smithsonian Institution's Museum Conservation Institute.


Story Source:

Materials provided by Washington State University. Note: Content may be edited for style and length.


Journal Reference:

  1. Jamie L. Weaver, John S. Mccloy, Joseph V. Ryan, and Albert A. Kruger. Ensuring longevity: Ancient glasses help predict durability of vitrified nuclear waste. American Ceramic Society Bulletin, 2016

Cite This Page:

Washington State University. "Ancient glass-glued walls studied for nuke waste solutions: WSU researchers aim to see how glass changes over time." ScienceDaily. ScienceDaily, 26 April 2016. <www.sciencedaily.com/releases/2016/04/160426144743.htm>.
Washington State University. (2016, April 26). Ancient glass-glued walls studied for nuke waste solutions: WSU researchers aim to see how glass changes over time. ScienceDaily. Retrieved May 29, 2017 from www.sciencedaily.com/releases/2016/04/160426144743.htm
Washington State University. "Ancient glass-glued walls studied for nuke waste solutions: WSU researchers aim to see how glass changes over time." ScienceDaily. www.sciencedaily.com/releases/2016/04/160426144743.htm (accessed May 29, 2017).

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