ASTM C 231 - PRESSURE METER Flashcards
What type of aggregate is the pressure meter test designed for?
Relatively Dense Aggregate
Air cooled/ Lightweight
What type of aggregate is the pressure meter CANNOT be used for? (3)
1) Lightweight
2) Air cooled blast furnance slag
3) Aggregate of high porosity
Why do you need an aggregate correction factor for the air pressure test?
Offset the air content added to the sample when the air is pushed out of the aggregate by water and paste.
0.1% - __?
What range % must the pressure gauge be readable too?
0.1% - 8%
__ - 1.25 the height
What must the diameter of the metal bowl be when doing the pressure test?
0.75 - 1.25 the height
To what % is the cover assembly supposed to prevent the expansion factor change the result of the test?
0.1%
__ inch +- 1/16 inch diameter
What is the diameter of the tamping rod for pressure meter?
5/8 inch
+-
1/16 inch diameter
How much longer must the tamping rod be than the mold?
(Inches)
4 Inches
What is the MAXIMUM size the tamping rod can be for the pressure test?
24 Inches
(150 Hz)
What is the MINIMUM frequency of an internal vibrator when used for a pressure test?
9000 vibrations/minute
__ Inch - 1 1/2 inch
What must the OUTSIDE DIAMETER RANGE of an internal vibrator for pressure testing?
3/4 inch - 1 1/2 inch
How much LONGER than the depth of the container must the internal vibrator be when pressure testing?
At least 3 inches longer
1) How often must the pressure meter be checked and verified?
3 months
M__, P__, G__
What are the 3 different strike-off plates that can be used with a pressure meter?
1) Metal
2) Plastic
3) Glass
What is the MINIMUM thickness required for a metal Strike-Off plate?
(Inch)
1/4 inch
What is the MINIMUM thickness required for a Plastic Strike-Off plate?
(Inch)
1/2 inch
What is the MINIMUM thickness required for a glass Strike-Off plate?
(Inch)
1/2 inch
How much wider than the diameter of the measure must the strike-off plate be?
(Inches)
2 Inches
Within _/16 inch
How smooth must the edges of the strike-off plate be?
Within what inch?
Within 1/16 inches
_/4 inches
How wide must a strike-off bar be for a pressure meter test?
3/4 inches
1/_ inches?
How thick must a strike-off bar be?
1/8 inches
1_ inches?
How long is a strike-off bar?
12 inches
1._ lbs +- 0.5 lbs
How heavy must a mallet be for a 1/2 ft3 AND SMALLER sized measure?
1.25 lbs
+-
0.5 lbs
How heavy must a mallet be for a LARGER THAN
1/2 ft3 sized measure?
2.25 lbs
+-
0.5 lbs
Calibration CANNOT EXCEED ___ months on TYPE B PRESSURE METERS?
3 Months
If concrete contains aggregate that would retain on a (1) _ inch sieve, wet sieve the sample over a (2) _ 1/2 inch sieve.
1) 2 inch sieve
2) 1 1/2 inch sieve
Rodding, Vibration, or Both?
What method of consolidation do you use for a slump that is >3 inches?
Rodding
Rodding, Vibration, or Both?
What method of consolidation do you use for a slump that is between 1 inch - 3 inches?
Vibration
OR
Rodding
Rodding, Vibration, or Both?
What method of consolidation do you use for a slump that is <1 inch?
Vibration
How many lifts do you use when using pressure meter doing the RODDING method of consolidation?
3 lifts
How many lifts do you use when using pressure meter doing the VIBRATING method of consolidation?
2 Lifts
At how many points do you insert the vibrator when using it as the method of consolidation during a pressure meter test?
3 different points
1/_ inches?
How much excess concrete do you want on top of the measure after you add your final lift?
1/8 inch
