The Pentagon, designated a National Historic Landmark in 1992, has never undergone a major renovation and, after more than 60 years, renovation is essential in order to meet current health, fire, and life safety codes and provide reliable structural, electrical, and mechanical systems. Absent a major renovation, the building’s infrastructure will become increasingly unreliable and soon unable to effectively support the headquarters and nerve center of this national military establishment. Major building systems have deteriorated to such an extent that repairs are no longer effective and entire systems need replacement.
The construction of the Pentagon began on September 11, 1941, and over 4 million square feet (371,612 square meters) of floor space was completed in 16 months. The Pentagon is considered the world’s largest low-rise office building. It is a five-story concrete structure with five distinct rings. Above the third floor, each ring is separated by an exterior space known as a lightwell. The speed of construction and a different standard of quality control left many areas of the lightwell walls with inadequate concrete cover over the reinforcing steel, sometimes less than 1/2 in. (12.7 mm). This lack of cover, combined with carbonation of the concrete, lead to corrosion of the reinforcing steel. As the steel corrodes, it expands up to ten times its original size, causing spalling of the concrete. It is estimated that there are 250,000 square feet (23,225.7 square meters) of spalled concrete in the lightwell walls.
Award of Excellence
Concrete Restoration of Yale University’s Paul Rudolph Hall
High-Rise — Hoffmann Architects, Inc.
Award of Excellence
Ronald Reagan Washington National Airport Terminal:
A Historic Concrete Façade Rehabilitation
Historic — C.A. Lindman, Inc.
Award of Excellence
Structural Rehabilitation of a Chloride-Contaminated Concrete Silo
Longevity — STAP, SA
Award of Excellence
The Solomon R. Guggenheim Museum Exterior Restoration and Building Enhancement
Low-Rise — WASA/Studio A
Award of Excellence
440 West Condominium Parking Garage Repairs
Parking Structures — The Euclid Chemical Company
Award of Excellence
Earth-Covered Magazine Protection Using Electro-Osmotic Pulse Technology
Special Projects — Electro Tech CP
Award of Excellence
Column and Beam Enlargements Using Self-Consolidating Concrete at a U.S. Ski Resort
Strengthening — Structural Preservation Systems, LLC
Award of Excellence
Galvanic Cathodic Protection of La Unidad Bridge
Transportation — Electro Tech CP
Award of Excellence
Kawaihae Harbor Mooring Structure Cathodic Protection
Water Structures — Electro Tech CP
Award of Merit
Renovation of Exterior Façade and Structure
High-Rise — Gale Associates, Inc.
Award of Merit
Boulder Colorado Union Pacific Railroad Depot Strengthening and Repair
Historic — BASF Construction Chemicals/Building Systems
Award of Merit
Dallas County Community College District Headquarters
Historic — Chamberlin Roofing & Waterproofing
Award of Merit
The Renovation of Cassell Coliseum at Virginia Polytechnic Institute—11 Years Later
Longevity —Sika Corporation
Award of Merit
Repairs to Contractor Building 1922
Masonry — Kasturi Coating
Award of Merit
Chapel Hill Street Parking Garage Repairs
Parking Structures — Lesco Restorations, Inc.
Award of Merit
Arizona Veterans Memorial Coliseum Roof Repairs
Special Projects — Gervasio & Associates, Inc.
Award of Merit
Lake Merritt Boat House Restoration
Special Projects — Alpha Restoration & Waterproofing
Award of Merit
Valley Creek Wastewater Treatment Plant Repairs
Special Projects — Walter P Moore
Award of Merit
Rehabilitation of the Pumarejo Bridge
Strengthening — Sika Colombia
Award of Merit
Structural Reinforcement for Centenario Bridge with Near-Surface-Mounted CFRP
Transportation — Ingelab, Chile
Award of Merit
Preventative Repairs to a Large Diameter Interceptor Sewer
Water Structures — NTH Consultants, Ltd.
