Repair Portal

RepairUndergroundShotcrete – The Repair Solution for the Memorial Tunnel

Henry A. Russell

In 1953, the Memorial Tunnel in Standard, WV, was constructed as a two-lane, 2800 ft (853 m) tunnel with semi-transverse ventilation. The owner operated the tunnel until the mid-1980s when a four-lane bypass was constructed to upgrade the turnpike to current Interstate standards. The tunnel

RepairStructuralSeismic Retrofit of Littlerock Dam

M.P Forest, D.R Morgan, J.R Obermeyer, P.L Parker and D.D LaMoreaux

RepairStructuralHistory of Shotcrete in Seismic Retrofit in California

James Warner

The widespread use of structural shotcrete actually began long before the first appli-cation was made. Its rise was politically motivated and its continued development dictated by the occurrence of earthquakes. Responding to a school fire in the 1920s, the Los Angeles School Board directed that

RepairSurface Preparation for Shotcrete Repairs

Denis Beaupre

Surface preparation is an important element of the repair process, both with shotcrete and cast-in-place concrete. It covers a large scope, including concrete removal, saturation of the substrate, the use of bonding agents (rare with shotcrete), and cleaning of the surface. These operations are influenced

RepairArchitecturalStructuralWashington State’s Capitol Seismic Repair

Marcus von der Hofen

Washington State’s Capitol Seismic Upgrade will surely rank as one of the top restoration projects of this decade and shotcrete proved to be essential to its success. As with most complex rehabilitations, many of the hurdles faced arose after the project had begun. The ability

RepairStructuralThick Section overhead Repair and Strengthening of a Concrete Pier: A Viable Shotcrete Solution

Roger Runacres

When considering placement options for thick section overhead concrete repair or strengthening, more often than not, the consideration of a shotcrete solution is overlooked. Historically, shotcrete has suffered from being mainly associated with vertical placements for above ground work. This may be due to the

RepairArchitecturalShotcrete Foundation Walls at the Smithsonian Portrait Gallery in Washington, DC

Howard L. Robbins

The National Portrait Gallery, located on the campus of the Smithsonian Institution in Washington DC, is one of the oldest government buildings in that historic city. It was the original location for the U.S. Patent Office and it was used as the site of the

RepairWaterproofing and Concrete Restoration at Blackwater Dam

David Jamieson

One of the oldest dams in New England, the Blackwater Dam in Webster, NH, is located approximately 8.6 mi above the confluence of the Blackwater and Contoocook Rivers. It is part of a network of five flood-control dams in the Merrimack River Basin that work

RepairConcrete Repair and Restoration at Franklin Falls Dam

David Jamieson and Joseph Colucci

The Aulson Company of Methuen, MA, completed a major concrete removal, shotcrete repair, and restoration project for the U.S. Army Corps of Engineers (USACE) at the Franklin Falls Dam, a 60-year-old structure in Franklin, NH. The Franklin Falls Dam was built by the USACE as

RepairShotcrete Repair of WWII Concrete Hulks

Neil McAskill and Roland Heere

In response to a shortage of plate steel during the Second World War, the United States Maritime Commission ordered 24 ships and 58 barges to be constructed with lightweight concrete. The ships were typically about 336 ft (110 m) long with a beam of 54