A method to defeat damage propagation autonomously in self-healing materials

By / December 10, 2010

a) Digital image correlation showing the recovery strain due to the shape memory effect around the crack location.b) Schematic of complete flow for the combination of active toughening with active healing. Credit Garcia, Lin and Sodano; AIP. Researchers out of the Multiscale Adaptive Sensors and Structures Lab at Arizona State University have developed an interesting…

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UPDATE: Video of the week: Chemistry of concrete

By / November 19, 2010

We’ve received a lot of feedback questioning some of the science presented in this video. I forwarded some of the comments on to the producers and requested a response. I just received the following response from the lab at University of Nottingham: “[Professor Martyn Poliakoff] has been away in Africa but I’ll ask him to…

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Haiti’s materials debris problem still slowing infrastructure rebuilding

By / November 18, 2010

Remains of Montana Hotel, Port-au-Prince. Credit: Joshua Lee Kelsey, USN. An ACerS Cements Division member tipped me off to an op-ed in the New York Times that appeared this summer that I (and probably many others) overlooked, but is still timely for many reasons. It It was written by three of the member’s colleagues at…

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Cement usage still coming under fire for role in Gulf of Mexico Deepwater Horizon oil spill

By / October 28, 2010

Credit: Coast Guard. I wrote about this issue back in May and June, and now the lead investigator of the presidential commission investigating the Deepwater Horizon oil spill in the Gulf has delivered to commissioners a letter that asserts that Halliburton staffers knew there were problems in the cement mixture used to line the drill…

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Iowa State Portland cement expert provide some insights on Deepwater Horizon oil well failure

By / June 18, 2010

A Portland cement concrete research engineer at Iowa State University says poor decision making, not poor technology, doomed the Deepwater Horizon. Bob Steffes, ISU’s Institute for Transportation, bases his conclusions on 17 years of overseas oil rig experience, including a blowout on an offshore well in the Middle East. In a release from the university,…

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