Consolidation of Concrete in Congested Areas at Darlington N.G.S.


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Title: Consolidation of Concrete in Congested Areas at Darlington N.G.S.

Author(s): Dan Bonikowsky

Publication: Special Publication

Volume: 96


Appears on pages(s): 7-18

Keywords: colling; concretes; consolidation; fresh concretes; mass concrete; nuclear power plants; placing; quality control; setting (hardening); Manufacturing

Date: 1/1/1987

Some of the problems experienced while placing concrete at the Ontario Hydro Darlington Nuclear Generating Station, located on the north shore of Lake Ontario, are described. Also presented are the novel placing methods and procedures used to overcome the placing problems to obtain the resultant quality concrete. Most of the concrete can be considered mass concrete because of its large dimensions. Placements in narrow walls have particular congestion problems and also require a slow placing rate due to formwork design limitations. Methods of achieving good consolidation and controlling time of set are described.