CT 533 Kelly Ball Flashcards
How heavy is apparatus for normal concrete?
30 +-0.1 lb.
Diameter of hemisphere on apparatus?
6 in”
Measures to the nearest what on apparatus shaft?
1/4”
How heavy is apparatus for lightweight concrete?
20+-0.1 lb.
How to calibrate apparatus?
Placing the ball and the feet on a plane surface, turn threaded shaft to obtain zero reading at the top of the sleeve, tighten lock nut.
Depth of concrete under ball should be what for 1 in. or smaller Max agg size?
6”
Depth of concrete under ball should be what for 1 in. or larger Max agg size?
8”
What must be done to the surface before testing?
Struck off level
How large of an area to be tested in ft^2
3 ft^2
Do you tamp, vibrate, or consolidate concrete before test?
No
Read the penetration to the nearest?
1/4”
Penetration of the feet of more than what indicates overworked concrete?
1/8”
How many reading are required and then averaged?
3
Individual readings shall be at least how far between centers?
9”
Minimum distance from the centerline of the handle to the nearest edge of the surface should be?
6”
