Card Set Information
ASTM C143 Concrete ACI Slump
Slump of Hydraulic-Cement Concrete
The slump test is applicable to plastic concrete with a maximum size aggregate of ___
1 1/2" [37.5mm]
When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be ___.
Removed by wet sieving the sample over 1-1/2" sieve.
The mold for making the slump test is in the shape of ___.
The frustum of a cone.
The height of the slump mold is ___.
The interior surface of the slump mold is allowed to have minor irregularities. True or False?
For use in the slump test, the end or both ends of the tamping rod must be ___.
Rounded to a hemispherical tip.
The sample of concrete for use in making the slump test must be obtained in accordance with ASTM Standard ___.
The slump mold should be in a dry condition before beginning the test. True or False?
The surface on which the slump mold will be placed must be ___.
Flat, level, moist, nonabsorbant, and free from vibration
The slump mold is filled in ___ layers.
Each layer should fill approximately ___ the volume of the mold.
The approximate concrete depth after placing the first layer is ___ and the second layer is ___.
2-5/8" [70mm], 6-1/8" [160mm]
What is the specified number of roddings for each layer?
How deep should the tamping rod penetrate into each layer?
Into the previous layer 1"
When rodding the bottom layer, the tamping rod must be ___ to uniformly distribute the strokes.
What must be done if the concrete drops below the top of the slump mold while the top layer is being rodded?
Add additional concrete to keep an excess of concrete above the top of the mold at all times.
Prior to lifting the mold, concrete must be removed from ___.
The area surrounding the base of the mold.
After the final rodding, the sides of the slump mold should be tapped lightly with the tamping rod. True of False?
When raising the slump mold, it should not be rotated or twisted. True or False?
How much time is allowed for lifting the slump mold?
5 +/-2 seconds
The measurement for slump is made from the top of the mold to what point of the concrete specimen?
The displaced original center of the top surface of the specimen.
The slump of the concrete is measured and reported to the nearest ___.
1/4" [5 mm]
How much time is allowed to conduct the slump test from beginning to completion?