Eliminating Swirls in Precast Panels Corning 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

(607) 739-6106
913 County Rd., Route 64
Elmira, NY
Wades Building Supply Inc.
2 Wall Street
Addison, NY
Valu Home Centers
Ames Plaza 1000 Victory H
Painted Post, NY
Morgan & Margraff Lbr.supp.co.
Condensary Lane
Elkland, PA
Bath - Auth Hometown
(607) 776-6659
7172 Ret 54
Bath, NY
Garreson Lumber Company
7201 Craig Rd.
Bath, NY
Fastenal- Elmira
1336 College Ave Elmira, NY, 14901
Elmira, NY
The Corning Building Co
Cbc Plaza, Park Ave
Corning, NY
Valu Home Centers
1105 Broadway Ave
Elmira, NY
Horseheads - D
(607) 739-3661
1020 Center St
Horseheads, NY
Data Provided by:

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

Related Articles
- Home Exterior Products Corning NY
The Distinction Doors Signature Series of fiberglass entry doors has been expanded with the Rustic Collection. The Southwestern-style doors use the manufacturer's Hydroshield Technology to protect against moisture and water damage and prevent rotting and rusting.
- Eco-Friendly Products Corning NY
- Hand Tools Corning NY
- Home Exterior Product Reviews Corning NY
- Flashing at Sills Corning NY
- Fan-Fold Foam Board Corning NY
- Eco-Friendly Product Reviews Corning NY
- High-Efficiency Products Corning NY
- In Style with Tile Corning NY
- Flue Liners for Masonry Chimneys Corning NY