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  • Field Evaluation of GNSS/GPS Based RTK, RTN, and RTX Correction Systems

    Abstract: This Coastal and Hydraulic Engineering Technical Note (CHETN) details an evaluation of three Global Navigation Satellite System (GNSS)/Global Positioning System (GPS) real-time correction methods capable of providing centimeter-level positioning. Internet and satellite-delivered correction systems, Real Time Network (RTN) and Real Time eXtended (RTX), respectively, are compared to a traditional ground-based two-way radio transmission correction system, generally referred to as Local RTK, or simply RTK. Results from this study will provide prospective users background information on each of these positioning systems and comparisons of their respective accuracies during in field operations.

  • On Enhancing the Mechanical Behavior of Ultra-High Performance Concrete Through Multi-Scale Fiber Reinforcement

    Abstract: Steel fibers are typically used in ultra-high performance concretes (UHPC) to impart flexural ductility and increase fracture toughness. However, the mechanical properties of the steel fibers are underutilized in UHPC, as evidenced by the fact that most of the steel fibers pull out of a UHPC matrix largely undamaged during tensile or flexural tests. This research aims to improve the bond between steel fibers and a UHPC matrix by using steel wool. The underlying mechanism for fiber-matrix bond improvement is the reinforcement of the matrix tunnel, surrounding the steel fibers, by steel wool. Single fiber pullout tests were performed to quantify the effect of steel wool content in UHPC on the fiber-matrix bond. Microscopic observations of pulled-out fibers were used to investigate the fiber-matrix interface. Compared to the control UHPC mixture with no steel wool, significant improvement in the flexural behavior was observed in the UHPC mixtures with steel wool. Thus, the addition of steel wool in steel fiber-reinforced UHPC provides multi-scale reinforcement that leads to significant improvement in fiber-matrix bond and mechanical properties of UHPC.

  • Far East District employees unite to donate Chuseok gifts to Korean orphans

    PYEONGTAEK, Republic of Korea - Employees of the U.S. Army Corps of Engineers (USACE) Far East District (FED) rallied together over a period of four weeks to collect and donate six large boxes filled with gifts for Sungyook Orphanage, located near District headquarters in Pyeongtaek, Sept. 13.

  • Olmsted Locks and Dam sets record, replaces first wickets

    Near the confluence of the Mississippi, Ohio, Tennessee and Cumberland Rivers is where more commerce passes through than any other location on the entire U.S. inland waterways, making the U.S. Army Corps of Engineers, Louisville District’s Olmsted Locks and Dam one of the busiest locks in the country. More than 70 million tons of commerce passes through the Olmsted, Illinois, facility each year. Olmsted Locks and Dam is very different from the other locks and dams on the Ohio River because it is the only one with a wicket dam.

  • The Summer 2021 issue of Crosscurrents is now available

    The Summer 2021 issue of Crosscurrents is now available.

  • ERDC’s ‘simple but unique’ pothole solution honored with Federal Lab Consortium award

    From NASCAR racetracks to aircraft runways on military bases across the world, wherever they develop, potholes can cause serious problems. A team at the U.S. Army Engineer Research and Development Center (ERDC) was recently honored with an award from the Federal Laboratory Consortium for their collaborative effort to address the worldwide problem of potholes with a unique innovation, Induction Hot-Mix Asphalt (iHMA).

  • The Ragnar Relay: “We can accomplish anything, if we do it together”

    Just weeks before racing for a day and a half together in a grueling relay, two competitors on the same team didn’t even know each other, despite that they both had a lot in common and worked for the same organization. Chris Stoughton and Josh Kaufmann both knew it takes a team to succeed as they prepared to compete in a Ragnar Relay.

  • Carlyle Lake Tri Event and Temporary Road Closures

    CARLYLE LAKE – The U.S. Army Corps of Engineers Carlyle Lake, in partnership with MSE Racing, will host the Carlyle Lake Tri on Sunday, 19 September 2021. The triathlon will begin in the Dam West Day Use Area at 6:30 a.m. and will consist of three groups, Sprint, Olympic Distance, and Half Distance, competing in a timed swim, bike, and run course. The swim portion will take place on the south side of the Dam West Beach. The bike course will start at the Main Dam and will travel North on Clinton and Bond County roads. The route of the run course will take participants through the West Spillway, General Dean Recreation Area, East Spillway, across Saddle Dam II, and the Main Dam. While visiting Carlyle Lake during the triathlon, visitors are encouraged to take extra caution while driving in the areas of the triathlon course.

  • Humble Canal Draft Environmental Assessment comment period extended

    The New Orleans District, U.S. Army Corps of Engineers extended the public comment period on the Draft Environmental Assessment for the “Mississippi River and Tributaries, Morganza to the Gulf of Mexico, Louisiana Humble Canal Gate Site Preparation and Initial Levee Preload,” through Sept. 25, 2021.

  • Corps of Engineers hosts open house at Lock and Dam 10

    ST. PAUL, Minn. – The U.S. Army Corps of Engineers, St. Paul District, is hosting an open house at Lock and Dam 10, in Guttenberg, Iowa, Saturday, Sept. 25, in conjunction with GermanFest.