Riparian Plaza Pier Cap

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Title: Riparian Plaza Pier Cap

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Publication: CIA

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Date: 2/13/2011

Abstract:
Riparian Plaza is a 200 metre high, 52-storey mixed commercial and residential development, which is situated partly on reclaimed river-front in the Brisbane CBD. The structure comprises a 17.5 metre square central service core incorporating 15 elevators. The core structure supports 60% of the gravity load and provides 80% of the lateral load resisting capacity. It is supported on twenty-five, 1.5 metre diameter, 20.0 metre deep, bored piers connected by a 3.0 metre deep pier cap. The pier cap is divided in two by a telecommunications easement. The larger section of the pier cap required 1125 cubic metres of concrete to be placed below the water table in marine sediment. A highly workable and durable 60MPa concrete mix was specially developed for placement and compaction in the pier cap congested with 18 layers of reinforcement and required control over the rate of release of heat of hydration. This paper describes the design, mix development, preliminary testing, temperature control and monitoring, placement and quality assurance process needed for the construction of the pier cap.


Concrete Institute of Australia, International Partner Access.

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