Materials Performance

SEP 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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central reason for the liner failure is that wet soil and underground pressure, both linked to deep-tunneling, caused cracks in the sewer pipe. Then water easily made its way into the pipe and ruined the liner, according to this theory. A city spokesman said the problem is the liner, not the depth of the pipe. Vermont Bridge Wired to Sense Structural Flaws From January 1998: University of Vermont (UVM) engineers are embedding fiber optic sensors into a steel truss bridge to detect damage like cracks, areas of strain, and road salt corrosion in the supporting rebar. The information is then relayed to a remote computer for analysis. Dubbed "the smartest bridge in the world" by UVM engineers, the Winooski River bridge is one of several that incorporate these robust, chemically inert fiber sensors. The sensors are immune to electromagnetic interference, and can measure such parameters as vibrations, temperature, and magnetic fields. New Instrument Tests World Trade Center Steel From August 2003: Researchers at the National Institute of Standards and Technology (NIST) (Gaithersburg, Maryland) are using a new instrument that operates like an air-powered battering ram to study steel salvaged from remains of the World Trade Center following the September 11, 2001, terrorist attacks. Consisting of two 1.5-m-long hardened steel bars arranged end-to-end, the apparatus is being used to improve understanding of how steel responds to high-stress, high-temperature conditions, according to NIST. The investigators contend that a key feature of the device is its ability to rapidly heat samples at rates of up to 50,000 °C per second. Australian Facility Boosts Gas Hydrates Research From October 2008: A new flow loop, commissioned by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) (Campbell, Australia), will help researchers find solutions to predict and control gas hydrates formation in offshore oil and gas production pipelines. The only one of its kind in Australia, the flow loop can simulate gas and liquid flows at high pressures and low temperatures— conditions that oil and gas pipelines are subjected to in deep-sea environments—and will be used to study gas hydrates formation, growth, and transportability. For more information, visit www.csiro.au . Hydrogen Embrittlement Causes Rods on Bay Bridge to Fracture From June 2013: On the new east span of California's San Francisco- Oakland Bay Bridge, 32 out of 92 high-strength, galvanized anchor rods embedded in the concrete pier (Pier E2) fractured several days after they were tightened. Engineers determined that the bolts broke due to hydrogen embrittlement (HE). Metallurgical analysis revealed the bolts were susceptible to HE because of a lack of uniformity in the steel's microstructure, and excess hydrogen, which caused the threaded areas to become brittle and fracture under high tension when the bolts were tightened. An ongoing investigation is looking into the source of the excess hydrogen. To learn more, visit baybridgeinfo.org. A7 MATERIALS PERFORMANCE: VOL. 57, NO. 9 SEPTEMBER 2018

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