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  • Advanced Cementitious Materials for Blast Protection

    Abstract: Advanced cementitious materials, commonly referred to as ultra-high performance concretes (UHPCs), are developing rapidly and show promise for civil infrastructure and protective construction applications. Structures exposed to blasts experience strain rates on the order of 102 s-1 or more. While a great deal of research has been published on the durability and the static properties of UHPC, there is less information on its dynamic properties. The purpose of this report is to (1) compile existing dynamic property data—including compressive strength, tensile strength, elastic modulus, and energy absorption—for six proprietary and research UHPCs and (2) implement a single-degree-of-freedom (SDOF) model for axisymmetric UHPC panels under blast loading as a means of comparing the UHPCs. Although simplified, the model allows identification of key material properties and promising materials for physical testing. Model results indicate that tensile strength has the greatest effect on panel deflection, with unit weight and elastic modulus having a moderate effect. CEMTECmultiscale® deflected least in the simulation. Lafarge Ductal®, a commonly available UHPC in North America, performed in the middle of the five UHPCs considered.
  • Cape Cod Canal Sagamore Bridge critical maintenance work, lane closures to start March 1

    The U.S. Army Corps of Engineers, New England District announced today that lane restrictions are scheduled to begin in March on the Sagamore Bridge spanning the Cape Cod Canal in Bourne, Massachusetts, due to critical maintenance work.
  • USACE announces October closure dates for South Service Road near Sandwich Recreation Center

     The U.S. Army Corps of Engineers, New England District announced today that a portion of the South
  • Estimating Bridge Reliability by Using Bayesian Networks

    Abstract: As part of an inspection, bridge inspectors assign condition ratings to the main components of a bridge’s structural system and identify any defects that they observe. Condition ratings are necessarily somewhat subjective, as they are influenced by the experience of the inspectors. In the current work, procedures were developed for making inferences on the reliability of reinforced concrete girders with defects at both the cross section and the girder level. The Bayesian network (BN) tools constructed in this work use simple structural mechanics to model the capacity of girders. By using expert elicitation, defects observed during inspection are correlated with underlying deterioration mechanisms. By linking these deterioration mechanisms with reductions in mechanical properties, inferences on the reliability of a bridge can be made based on visual observation of defects. With more development, this BN tool can be used to compare conditions of bridges relative to one another and aid in the prioritization of repairs. However, an extensive survey of bridges affected by deterioration mechanisms is needed to confidently establish valid relationships between deterioration severity and mechanical properties.
  • Engineering With Nature® book launch is a resounding success

    WASHINGTON, D.C. (Jan. 24, 2019) — The U.S. Army Corps of Engineers launched the book, Engineering
  • Parents ‘show and tell’ on ‘Take Your Kids to Work Day’

    NASHVILLE, Tenn. (April 14, 2017) – Excited youngsters eagerly donned life jackets today for the chance to learn about navigation and water safety on board several Corps of Engineers boats docked on the Cumberland River at Music City’s Riverfront. Throughout the day they participated in lots of fun activities, learned about Nashville District operations and missions, and their parents did a lot of “show and tell” on “Take Your Kids to Work Day.”
  • Bridges serves on international peer-review panel

    Dr. Todd S. Bridges, senior research scientist, with the U.S. Army Engineer Research and Development
  • Corps, GDOT partnership balances environment with development

    Did you know that every roadway and bridge in the state of Georgia is linked to the U.S. Army Corps of Engineers? That's because of a partnership between the Corps and the Georgia Department of Transportation (GDOT)—the lead state agency for constructing road projects.
  • Corps to close Upper Cumberland Real Estate Project Office

    PINEVILLE, Ky. (Sept. 28, 2011) – The U.S. Army Corps of Engineers Nashville District announces the closure of the Upper Cumberland Real Estate Project Office in Pineville, Ky., at the close of business on Sept. 30, 2011. However, the Upper Cumberland Construction Office will remain open for an undetermined time frame to complete ongoing construction projects.