Traditional 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
Reaching 20 MPa (2900 psi) in 2 Hours is Possible
In the mining and tunneling industries, time is critical; and as the mining/tunneling cycle becomes shorter, production increases.
Sustainable Shotcrete Using Blast-Furnace Slag
Two shotcrete mixtures were designed based on sustainability for use in mining ground support.
Fort McHenry Tunnel Miscellaneous Structural Repairs
At 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.
Soudan Mine Shaft Rehabilitation
The Soudan Mine is a historic taconite and iron ore mine in Northeastern Minnesota.
Shotcrete Work in Confined Space Area
Shotcrete 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.
Meadow Brook Hall Historic Bridge Restoration
Meadow 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.
Surface Preparation for Shotcrete Repair
When placing shotcrete in a concrete repair application, one cannot overstate the impor tance of the bond between the shot crete and the concrete substrate.
The Oregon City Bridge, Part II
This is the second of two articles discussing the Oregon City Bridge. The first article, ?The Oregon City Bridge, Part I,? was published in the Fall 2012 issue of Shotcrete and discussed the historical background of the bridge. This article covers the recently completed rehabilitation project.