A self-healing system for concrete developed in Europe was inspired by a Dutch researcher’s trip to Yellowstone National Park in Wyoming. As concrete ages, water seeps into cracks, which widen as the water freezes and thaws. In the new approach, specific organic mineral precursor compounds plus spore-forming alkaliphilic bacteria are incorporated into concrete during the manufacturing process. They produce calcite particles up to 100-μm in size that are shown to seal micro- to even larger-sized cracks. Erik Schlangen, a professor at Delft Technical University in The Netherlands said he got the idea after seeing deposits of calcite near geysers at Yellowstone. The improvement in crack resistance is said to more than compensate for a 10 percent loss in compressive strength due to incorporation of the bacteria, says Schlangen. The approach will also reduce the amount of raw materials used in concrete.
This slideshow includes several versions of multi-materials machines, two different composites processes including one at microscale, and two vastly different metals processes. Potential game-changers down the line include three microscale processes.
UL is partnering with metals additive manufacturing (AM) supplier EOS to provide AM training to EOS's customers. It's designed to promote correct usage of AM technologies by OEMs and others in manufacturing.
To commemorate Earth Day, we take a look at the state of ocean plastic. If things don't change, by 2050 the oceans will contain more plastic than fish by weight. Here are the problems, as well as some solutions.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.