DSS 35 Antenna Concrete Pedestal

CTLGroup performed an evaluation of concrete consolidation and developed repair design recommendations for the DSS 35 reinforced concrete antenna pedestal structure. Concern was related to observed surface voiding and lack of concrete consolidation in an elevated roof slab at the Canberra Deep Space Communications Complex in Australia. The pedestal roof and walls enhibited regions of poor consolidation. Evidence of water seepage was also observed. Nondestructive testing (NDT) and coring characterized conditions on the roof slab and perimeter track wall of the antenna support structure.

The NDT results revealed that the comination of hot weather, equipment breakdown, low slump concrete mixture, and poor workmanship resulted in the observed deficiencies. CTLGroup recommended concrete repairs, leaking cracks, and joints be injected with a low viscosity, high modulus epoxy resin. Installation of a traffic-bearing elastomeric waterproofing membrane was alson considered for the topside of roof slab.


Civil Infrastructure

Consulting Services

Concrete Mixture Development & Qualification

Project Specification Review & Development

Materials Science + Engineering

Structural Engineering + Evaluation

Non-Destructive Evaluation

Repair, Restoration, Retrofit

Structural Condition Assessment

Laboratory Services

Concrete + Cement-Based Materials

Chemical Services


Physical Testing of Concrete + Mortar

The Canberra Deep Space Communications Complex opened in 1965  as a means to track the Appollo Lunar Module.


Year of Completion


Hours Worked


Size of Main Aperature (Meters)

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