Repair Portal

RepairCuring Silica Fume Shotcrete with Wet-Sprayed Cellulose

Medhat Shehata and Tom Klement

Chloride-induced corrosion is the primary cause of deterioration in many concrete bridges in Canada and the northern United States. For corrosion to take place, the chloride ions permeate through the interconnected pores of the concrete toward the embedded steel reinforcement and attack the passive layer

RepairArchitecturalUndergroundStructuralQuality Management of Shotcrete in North America

Dudley R. “Rusty” Morgan and Roland Heere

As for all construction materials, a proper program of quality management should be implemented in shotcrete construction to protect the owner™s investment. This article briefly examines typical shotcrete Quality Management (QM) practice in North America. QM can be considered to be comprised of Quality Assurance

RepairSpecified Dilemmas

Roland Heere

On shotcrete sites, it is not unusual to hear comments starting with œIn a perfect world, … Of course, in a perfect world,there wouldn™t be any shotcrete because there wouldn™t be anything to repair or strengthen. Fortunately, there are plenty of imperfections in the jurisdiction

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