SOME ASPECTS OF THE DESIGN AND CONTROL OF SELF-COMPACTING CONCRETE FOR AN UNDERWATER APPLICATION
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Published:2002
J Knights, D E Wimpenny, 2002. "SOME ASPECTS OF THE DESIGN AND CONTROL OF SELF-COMPACTING CONCRETE FOR AN UNDERWATER APPLICATION", Innovations and Developments In Concrete Materials And Construction: Proceedings of the International Conference held at the University of Dundee, Scotland, UK on 9–11 September 2002, Ravindra K. Dhir, Peter C. Hewlett, Laszlo J. Csetenyi
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Approximately 11,000m3 of underwater concrete were poured to form a 10m deep mass concrete plinth for seismic stability, as part of a recent naval dockyard redevelopment. The concrete satisfied stringent requirements, including the ability of flow and self compact whilst resisting segregation and washout, with a low risk of early-age thermal cracking.
Optimisation of aggregates and admixtures was achieved by extensive trial mixing, using standard and non-standard tests to refine the rheological properties of the concrete. The mix utilised ground granulated blastfurnace slag and limestone aggregates to control early-age thermal stresses, and incorporated an underwater (anti-washout) admixture and superplasticiser to provide the necessary cohesion and workability.
This paper outlines the mix development including details on laboratory and field trials. Limitations of test methods when assessing self-compacting concrete workability are also addressed. Practical considerations in the control of self-compacting concrete are discussed including methods of the site control implemented, which were established by the trials.
INTRODUCTION
MIX DEVELOPMENT
MIX SENSITIVITY TRIALS
MIX CONTROL
CONCLUSIONS
REFERENCES
