Bridge and other infrastructure failures have been generating significant headlines in the United States. The German state Hesse has a new idea: plastic composite bridges. Europe’s’ first road bridge made of fiber-reinforced thermoset polymer opened recently, spanning a federal highway north of Frankfurt. The initial cost of the materials is higher, but there are long-term maintenance benefits. The pultruded polymer structure is also less than one-fourth the weight of a pre-stressed concrete superstructure. It’s not a giant bridge – just 89 feet long by 16 feet wide. It weighs 80 metric tons.
Some big problems had to solved, including adhesive bonding of the sections and testing. Materials being evaluated for bridge construction include glass and carbon fibers and matrix polymers of vinyl ester, epoxy and polyester. Officials say the new German bridge, located in the town of Friedberg, is expected to last 50 years without repairs. The bridge is made of FRP polymer glued to steel sections. The bridge was prefabricated and assembled on site in one day.
At IMTS last week, Stratasys introduced two new multi-materials PolyJet 3D printers, plus a new UV-resistant material for its FDM production 3D printers. They can be used in making jigs and fixtures, as well as prototypes and small runs of production parts.
Plastic bags can become useful as either raw materials for plastics or feedstock for fuel. It's when they're not recycled that they become a major problem. That's what California's bag ban will prevent.
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