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.
HP revealed more of its 3D printing plans in a recent webinar. Senior vice president of inkjet and graphics solution business Stephen Nigro spoke about how the technology works and expanded on HP's vision of open collaboration to commercialize its Multi Jet Fusion 3D printing technology for end-production, and open collaboration on new materials. He also said HP will create software to help users decide when to use Multi Jet Fusion versus conventional subtractive manufacturing.
A lightweight electric urban concept car designed by several European companies weighs only 992 lb without its battery. It would have weighed 26.7 lb more if its windows were made of glass instead of the specially coated LEXAN polycarbonate resin from SABIC Innovative Plastics.
Skylar Tibbits' team in MIT's Self-Assembly Lab is now 4D printing self-assembling shapes made of programmable carbon composites and custom wood grain. The composites are being used in a sport car airfoil, and the wood grain is beautiful.
The NanoSteel Company has produced high-hardness ferrous metal matrix composite (MMC) parts using a new nanosteel powder in a one-step 3D-printing process. Parts are 99.9% dense, crack-free, and with wear resistance comparable to M2 tool steels.
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.