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Chapter 4 - Producing Silica-Fume Concrete
Finishing Flatwork

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Slide
Many of the parking structures where silica-fume concrete is used tend to be over-finished. By this we mean that the concrete receives more finishing than is necessary for the application. The more steps that are involved in the finishing process, the longer the concrete will be exposed to the potential for plastic shrinkage.

Silica-fume concrete usually does not bleed. While this is a good feature as far as strength and durability are concerned, it does increase the potential for plastic shrinkage. The "one-pass" finishing process was developed to take advantage of the lack of bleeding in silica-fume concrete and to get the concrete finished as quickly as possible.

One of the problems associated with implementing the one-pass technique may be resistance from the owner or architect, who may want to specify more finishing than is needed in a parking structure. A broomed finish is usually satisfactory for such applications. The trial placement is a good time to get the owner or architect's approval for the finish that will be applied during the project.