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Inspection/Evaluation Methods:

As a result of the spalling that occurred and the evacuation of the two hangar bays, the structural engineers were engaged to both evaluate the overall structural integrity of Hangar Building 340 and then provide repair methods that could be quickly performed.


A thorough structural analysis was made using a 3-dimensional computer program known as SAP 2000. This analysis indicated that the basic design for this hangar was quite adequate to resist gravity and wind loads.


An extensive inspection program was then made to determine the extent of the corrosion of the reinforcing steel on the underside of the roof shell and the exterior arches. The primary inspection method for this evaluation was provided by a large number of "soundings" made by the impact of a hammer on the concrete. The results of the soundings determined that the corrosion of the reinforcing steel had spalled/laminated the concrete in a large number of locations, especially on the exterior outer portion of the arches.


In addition to this inspection methodology, a testing procedure was established to determine:

Compressive strength of concrete obtained by taking cores.

Thickness of the thin shell concrete slabs determined by roto hammer penetrations.

Ultrasonic testing to determine concrete compressive strenght.

Half-cell potential measured to determine corrosion activity of the reinforcing steel.

Quality of concrete, depth of carbonation and chloride content obtained by cores examined by a testing company in Skokie, Illinois.

Finally, portions of the concrete that were spalled were removed at a number of locations to determine the extent/degree of corrosion of the underlying reinforcing steel.


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ACE Restoration & Waterproofing, Inc.
2940 E. Miraloma Ave.
Ste. B
Anaheim, CA 92806
Fax: 714.526.7965


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  waterproofing, and more concrete technologies in Anaheim California (CA)
  by ACE Restoration and Waterproofing.

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