Air Content Of Plastic Concrete By The Pressure Method Flashcards
The pressure method of determining air content is not suitable for concrete containing what type of aggregate
Low density or other porous aggregates
What is the maximum size aggregate allowed in the concrete sample when this test method is to be performed in a 7 L bowl?
40 mm
When the concrete sample contains a bit larger than the maximum allowed for a 7 L measuring bowl what must first be done to the concrete sample before running the test
Must wet sieve through 40 mm square openings
In how many layers is the measure to be filled when the concrete sample will be compacted by rodding
Three layers of
How many layers is the measure to be filled when the concrete sample is self consolidating concrete?
Two layers
When rodding the concrete sample in a 7 L bowl what is the specified number of strokes required for each layer?
25
After drawing each layer which be done to the measure before adding another layer of concrete
Outside should be tapped smartly, 10 or more times with a mallet
Rocking and shaking the bucket against the ground after riding each layer is an acceptable consolidation technique to replace the mallet. T/F
False
The concrete shall be vibrated with a specified slump of
40 mm or less
When internal vibration is used as the consolidation technique, the measure shall be filled in blank layers
Two approx equal
When ordering the concrete by internal vibration, the vibrator shall be inserted at blank for each blank
Three points / layer
What must be done if there’s a slight deficiency in the quality of concrete in the measure following consolidation of the final layer
Add a small amount of concrete with the scoop to correct a deficiency before strike off
How soon after the concrete sample has been transported and remixed most pressure metre air test be completed
10 minutes
Air content by the pressure method must be reported to the nearest
0.1 %
