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Investigation and Rehabilitation to Extend Service Life of DSS-13 Antenna Concrete FoundationAn investigation to establish the cause and, devise a repair technique to maintain the serviceability of the DSS-13 26 meter antenna is described. Core samples are obtained from the concrete and various laboratory tests conducted. In-place nondestructive type tests are also performed. The tests established that the concrete is deteriorating because of alkali aggregate reactivity. This is a phenomenon wherein certain siliceous constituents present in some aggregates react with alkalies in the portland cement to produce a silica gel which, in turn, imbibes water, swells, and cracks the concrete. The scheme consists of a supplemental steel frame friction pile anchored grade beam encircling the existing foundation. This system provides adequate bracing against base shear and overturning due to seismic loading. Larger cracks are sealed using a pressure injected two-component epoxy.
Document ID
19840024566
Document Type
Reprint (Version printed in journal)
Authors
Riewe, A. A., Jr. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 12, 2013
Publication Date
August 15, 1984
Publication Information
Publication: The Telecommun. and Data Acquisition Rept.
Subject Category
ENGINEERING (GENERAL)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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