RepairStructuralSt. Paul Union Depot
Richard Maxwell and Dave Sawyer
Read MoreThe St. Paul Union Depot, also known affectionately as SPUD, was originally built in 1881, at which time it became a landmark transportation facility in downtown St. Paul, MN.
RepairUndergroundStructuralCSX Pinkerton Tunnel
Dennis Bittner, Nick Laviolette, and Denis Laviolette
Read MoreAs part of the National Gateway Clearance Project, the Pinkerton Tunnel, located in Markleton, PA, was to be removed because it did not have the required height clearance to accommodate double-stack freight railroad cars.
RepairUndergroundStructuralWhere Are We Now with Sprayed Concrete Lining in Tunnels?
Andrew Pickett and Dr. Alun Thomas
Read MoreTraditional methods of sprayed concrete lining (SCL) tunnels (in soft ground) comprise a temporary primary lining of sprayed concrete with a sheet membrane inside and a permanent cast in-situ concrete lining, usually reinforced with steel bars
UndergroundStructuralReaching 20 MPa (2900 psi) in 2 Hours is Possible
Simon Reny and William Clements
Read MoreIn the mining and tunneling industries, time is critical; and as the mining/tunneling cycle becomes shorter, production increases.
UndergroundStructuralGeneralSustainable Shotcrete Using Blast-Furnace Slag
Philip Sawoszczuk, Dr. Michelle Nokken, and Dr. Marc Jolin
Read MoreTwo shotcrete mixtures were designed based on sustainability for use in mining ground support.
RepairUndergroundStructuralFort McHenry Tunnel Miscellaneous Structural Repairs
John Becker
Read MoreAt the time of its construction, the widest underwater tunnel in the world, the Fort McHenry Tunnel in Baltimore, MD, was opened to traffic in 1985.
RepairUndergroundStructuralSoudan Mine Shaft Rehabilitation
Shane McFadden
Read MoreThe Soudan Mine is a historic taconite and iron ore mine in Northeastern Minnesota.
RepairUndergroundStructuralShotcrete Work in Confined Space Area
Ted W. Sofis
Read MoreShotcrete work, by its very nature, provides an excellent method of installing concrete materials in storage bins, hoppers, culverts, inlets, vaults, tanks, and other areas, where it is difficult to transport and efficiently install materials by conventional casting methods.
RepairArchitecturalStructuralMeadow Brook Hall Historic Bridge Restoration
Jessica S. Farley
Read MoreMeadow Brook Hall was built in the early twentieth century from the successes of automobile mogul John Dodge, his widow Matilda Dodge, and Matilda?s second husband Alfred Wilson.
RepairStructuralSurface Preparation for Shotcrete Repair
Simon Reny
Read MoreWhen placing shotcrete in a concrete repair application, one cannot overstate the impor tance of the bond between the shot crete and the concrete substrate.