You May Also Like ACI searching for excellence in concrete construction Typical broom specification clauses from MasterSpec and American Concrete Institute (ACI) specifications or guides are as follows: While a sample panel and a mockup both provide an indication of the texture desired, these are not useful for evaluating how uniform or consistent the texture will be on a large-scale concrete placement. The differences in the size effect are shown in the photos above, which compare the finishers brooming a 1.2-m wide sidewalk and a large-scale concrete placement for a parking garage.ĭue to the size effect, specifiers, architects, and owners must have realistic, but different, expectations for sidewalks and large-scale concrete placements.
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visibility is limited when finishers are standing 6 m or more away from the start of the broom pass-this can be controlled with the ability to see where and how to place the broom for a 1.2-m wide sidewalk.weather effects on large-scale concrete placements with different truckloads of concrete cause varying degrees of surface stiffness, making it difficult to produce a consistent texture and.slump, setting time, bleeding) of the concrete textured by a single broom pass batch-to-batch variations in the many truckloads of concrete make it more difficult to produce a consistent broom texture due to the varying properties ( e.g.broom handles up to 7.6 m (25 ft) long are used, making it more difficult to control the broom-a short broom handle gives the finisher the ability to vary the pressure and angle at the broom bristle to produce a more consistent texture across concrete surfaces that may vary in stiffness it is difficult, if not impossible, to vary bristle pressure and angle with longer broom handles.
multiple end-to-end broom passes are needed.The main differences in providing a broom finish for a large-scale concrete placement as opposed to a sample, mockup, or sidewalk are: Photo courtesy CECO Concrete Construction Controlling the depth of broom marks is just one of the problems faced by finishers. Brooming large-area placements is a much more difficult task than brooming sidewalks or driveways.
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