Tips & Suggestions

Proper vibrating techniques will:

• Produce concrete with the maximum strength and qualities designed in the mix.

• Bond rebar to maximize strength.

• Slow penetration of rust causing liquids by increasing density.

• Eliminate rock pockets and lift lines.

• Minimize patchwork, improving surface appearance by removing trapped air.

Proper consolidation techniques will not:

• Cause segregation in well designed

• Eliminate a significant amount of entrained air.

• Normally damage the lower layers, as long as the concrete in these lower layers becomes plastic under the vibrating action.

For Quality Concrete, Oztec Suggests:

1.  Select the largest vibrator suitable for the job.

2.  Insert the vibrator vertically, allowing it to sink to the desired depth by its own weight.  Forcing it may lock it between

     rebars.

3.  Hold the vibrator 5 to 15 seconds then slowly lift vibrator up, staying behind the trapped air's upward movement.  Allow

     about 15 seconds for each 2 foot distance to avoid re-trapping air.

4.  A slight up and down movement will close the hole formed by the vibrator.

5.  Withdraw the vibrator quickly when near the top to prevent churning air into the top layer.

6.  Move vibrator and re-insert at a distance 1 ? times the Radius of Action?As shown in the diagrams.

7.  Allow vibrator to pass 3 to 6 inches into the preceding layer to ensure knitting the two layers together, insuring a good

     bond and preventing "lift lines" when forms are removed.

8.  Try to limit pours to 2 to 3 feet high, so air has less resistance to escape.

9.  Do Not use vibrator to move concrete laterally?it causes segregation (use a shovel).  Place vibrator in the center of

     mounds to knock them down.

IMPORTANT: Trapped air moves upward in the mix from

 1 to 3 inches per second. (1 inch in near 0 slump; 3 inches

in 4 to 5 inch slump).

Extension Cord Wire Size Per UL Specifications:

Too light an extension cord can cause poor performance and motor burn out.