RepairUndergroundStructuralThe Rondout Bypass Tunnel Shafts – Shotcrete Lining
Paul Madsen, Bade Sozer, Thomas Hennings, & Eileen Test
Read MoreThe Rondout-West Branch Tunnel (RWBT), a segment of the Delaware Aqueduct (the Aqueduct), was built from 1937 to 1944 and provides about 50% of New York City’s total water supply. The tunnel is concrete lined and has a finished inside diameter of 13.5 ft (4.1
RepairStructuralO’Hare Plaza West Drive and Executive Garage Restoration
Joshua Freedland
Read MoreWhile infrastructure projects such as parking garages are often the last projects to be funded due to their utilitarian nature, they are important to the health of commercial properties since they are often the first impression for tenants and visitors. At O’Hare Plaza, the parking
RepairStructuralThe Neville Island Bridge Project
Ted Sofis
Read MoreThe Neville Island Bridge Rehabilitation project originally came out for bid in 2018. The bridge is located in Allegheny County, PA and within PennDOT’s District 11. In the bid package, it was noted that construction could not begin until a nesting pair of Peregrine Falcons
RepairStructuralMoyie Dam Repair: Back to the Future
Mike Newcomb and Leo Waddell
Read MoreMoyie Dam at Bonner’s Ferry in northern Idaho started initial construction just before WWII. They shut down construction during the war. After the war was over, the dam went into service in the late 1950s.
RepairUndergroundStructuralTAKING TUSCARORA INTO ANOTHER CENTURY
Kristina Smith
Read MoreThe Tuscarora Mountain Tunnels in Pennsylvania have a fascinating history. The older of the two tunnels, built between 1938 and 1940, was designed to carry a railroad that never came into service. Industrialists of the day, William Henry Vanderbilt and Andrew Carnegie, were backers of
RepairStructuralSHOTCRETE VS FIRE AND WATER REPLACEMENT OF FLUME 4/5/6 AND 30
Jason Myers
Read MoreOn August 14, 2021, the Caldor Fire started in Northern California near Pollock Pines, CA. The fire ended up consuming almost 222,000 acres (90,000 hectares) and seriously threatened South Lake Tahoe. Besides the over 1000 structures that were lost, the fire also burned along a
RepairEnhancing Efficiency and Safety in Concrete Shaft Restoration: A Shotcrete Success Story
Jacqueline Ipema
Read MoreIn September 2021, American Concrete Restorations Inc. was contracted to perform 60 yd³ (46 m³) of concrete repairs to an existing shaft that is used to access an underground tunnel system in a southern suburb of Chicago, IL. The job was for the Metropolitan Water
PoolRepairArchitecturalUndergroundStructuralInternationalRecreationalGeneralThe Jetcreter – The First Continuous-Feed, Dry-Mix Gun
Ted Sofis
Read MoreDuring the summer of 1970, on my 18th birthday, my father woke me up and told me they needed me on a job. I drove out that morning in July to the Crucible Specialty Steel plant in Midland, PA. It was my first experience working
PoolRepairRecreationalSobre Productividad, Cálculo de Costos de Trabajo y Éxito en el Shotcrete
Ryan Oakes
Read MoreComo miembro de la Sociedad de Honor Internacional en Economía y con una doble licenciatura en Finanzas y Banca, ingresé al mundo del shotcrete preparado de manera un poco diferente que la mayoría de los que ingresan a esta industria. Eso fue hace más de
RepairUndergroundStructuralAdvances in Shotcrete Technology for Ground Support in Tunnels and Mines in North America
Lihe (John) Zhang, Ph.D., P.Eng., F.ACI & Dudley (Rusty) Morgan, Ph.D., F.ACI
Read MoreIn recent years, shotcrete has been widely used for ground support in civil tunnels and mines in North America. Shotcrete technologies have advanced with robust robotic sprayers, high-performance shotcrete mixture designs, and high-performance fiber reinforcement in conjunction with rigorous qualification of shotcrete nozzlemen and QC