Eliminating Swirls in Precast Panels Liverpool NY

What can we do to eliminate swirls in precast panels? Sid Freedman of the Precast/Prestressed Concrete Institute says such swirls are signs of segregation caused by the placing method. Read on to know more.

Local Companies

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315-451-3807
7184 Morgan Rd Liverpool, NY, 13090
Liverpool, NY
T&K Lumber Co, Inc.
315-689-3005
170 Route 5 West Elbridge, NY, 13060
Elbridge, NY
Doow Lumber
315-656-7271
5912 N Burdick St
East Syracuse, NY
City True Value Hardware
(315) 476-0436
214 S Geddes St
Syracuse, NY
Great Northern Mall
(315) 652-4800
4155 Rt 31
Clay, NY
Salt City Hardware
(315) 362-3254
325 Nottingham Rd
Syracuse, NY
Fastenal- Syracuse
315-474-0970
920 Spencer Street Syracuse, NY, 13204
Syracuse, NY
McGowan's Hardware
315-687-6168
991 E Genesse St
Chittenango, NY
Burke's Home Center
315-592-2244
65 North Second Street
Fulton, NY
The Home Depot
(315)622-0702
3861 State Route 31
Liverpool, NY

Source: THE CONCRETE PRODUCER/CONCRETE JOURNAL MAGAZINE
Publication date: December 1, 1998

We produce precast exposed-aggregate sandwich panels using concrete made with Type III cement, a 0.38 water-cementitious materials ratio and enough superplasticizer to achieve a 7- to 8-inch slump. The forming bed is made of wood. Using a bucket that passes down the center of the bed, we pour enough concrete for a 3-inch-thick layer and rake the concrete to the edges. We consolidate that layer with an immersion vibrator, then screed it off before adding a 2-inch-thick insulation board and 3 more inches of concrete.When we sandblast the formed panel surface to expose the 1/2-inch limestone, the limestone particles appear in groups or swirls. What can we do to eliminate this problem?

Sid Freedman of the Precast/Prestressed Concrete Institute says such swirls are signs of segregation caused by the placing method. You should place concrete on top of concrete in successive bucket passes because blending separate puddles or passes of concrete creates areas that are heavy in mortar. Raking can cause a similar problem.Ed Boyle, plant manager at Lombard Architectural Precast, Alsip, Ill., suggests using a placing bucket with a wider-than-normal gate, then overlapping each successive pass to eliminate paste streaks.He also suggests using a vibrating screed that hangs off of the form side rails at the correct depth to consolidate your first layer of concrete.

Click here to read full article from The Concrete Producer

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