ACI Certification Concrete Field Testing Tech Grade 1
Questions With Complete Solutions
(gravimetric method) The outside diameter or side dimension of
the vibrating element must be at least _____ but not greater
than______ Correct Answers 19mm (.75 in), 38mm (1.5 in)
(gravimetric method) What is the specified weight of the mallet
used on measures that are 14L [.05 ft³] or smaller? Correct
Answers 600 +/- 200 g (1.25 +/- .5 lbs)
(pressure method) If the concrete sample is vibrated it must be
filled in _____ layers. Correct Answers 2
(pressure method) If the sample is to be consolidated by rodding
the measure must be filled in ___ layers. Correct Answers 3
(sampling) Start forming molds within _______ after obtaining
final mixed sample. Correct Answers 15 min
(slump) Prior to lifting the mold, concrete must be removed
from? Correct Answers surrounding base and mold
(slump) Rod each layer __ times uniformly over the cross
section with the rounded end of the rod. Correct Answers 25
(slump) The approximate concrete depth after placing the first
layer is ______, and the second layer is______. Correct
Answers 2 5/8 in (70 mm), 6 1/8 (160 mm)
,(slump) What must be done if the concrete drops below the top
of the slump mold while the top layer is being rodded? Correct
Answers add concrete
(slump) When rodding the bottom layer, the tamping rod must
be _________ to uniformly distribute the strokes Correct
Answers slightly inclined
(slump) While rodding each layer the rod should penetrate __
inch into the the layer below. Correct Answers 1
A 150 by 300 mm (6 by 12 in) cylinder mold can be used for
concrete containing aggregate with particles not exceeding
___________ in size, without the need for wet sieving the
concrete. Correct Answers 50 mm
A composite sample of concrete is required even if the only
purpose for obtaining the sample is to determine temperature?
true or false Correct Answers false
A mallet weighing _______________ must be used to tap the
sides of the bowl after rodding each layer (air content) Correct
Answers 600 +/- 200 g (1.25 +/- .5 lbs)
A maximum temperature of freshly mixed concrete is specified
in C1064/1064M. true or false Correct Answers false
A plastic container can be used for gravimetric method. T or F
Correct Answers false (steel)
, According to Test Method C1064/1064M, what is one reason to
take the temperature of concrete? Correct Answers verify
conformance to specified requirements
After completing the strike off procedure what must be done
before weighing the measure and sample? Correct Answers
clean off exterior of measure
After consolidation of the final layer an excess of concrete
______ above the top of the measure is considered optimum.
Correct Answers 3 mm (⅛ in)
After molding test specimens, you should wait two hours before
moving them to the location of initial storage. True or False?
Correct Answers false (immediately)
After rodding each layer 25 times what must be done for
pressure method? Correct Answers tap the sides 10-15 times
with mallet
After the final rodding, the sides of the slump mold should be
tapped with your tamping rod? T or F? Correct Answers false
After the temperature of the concrete is read, what is then
required? Correct Answers report the temp
Air meters used for gravimetric method must conform to
astm______ and be calibrated for volume according to
astm_____. Correct Answers C231, C29/C29m
Questions With Complete Solutions
(gravimetric method) The outside diameter or side dimension of
the vibrating element must be at least _____ but not greater
than______ Correct Answers 19mm (.75 in), 38mm (1.5 in)
(gravimetric method) What is the specified weight of the mallet
used on measures that are 14L [.05 ft³] or smaller? Correct
Answers 600 +/- 200 g (1.25 +/- .5 lbs)
(pressure method) If the concrete sample is vibrated it must be
filled in _____ layers. Correct Answers 2
(pressure method) If the sample is to be consolidated by rodding
the measure must be filled in ___ layers. Correct Answers 3
(sampling) Start forming molds within _______ after obtaining
final mixed sample. Correct Answers 15 min
(slump) Prior to lifting the mold, concrete must be removed
from? Correct Answers surrounding base and mold
(slump) Rod each layer __ times uniformly over the cross
section with the rounded end of the rod. Correct Answers 25
(slump) The approximate concrete depth after placing the first
layer is ______, and the second layer is______. Correct
Answers 2 5/8 in (70 mm), 6 1/8 (160 mm)
,(slump) What must be done if the concrete drops below the top
of the slump mold while the top layer is being rodded? Correct
Answers add concrete
(slump) When rodding the bottom layer, the tamping rod must
be _________ to uniformly distribute the strokes Correct
Answers slightly inclined
(slump) While rodding each layer the rod should penetrate __
inch into the the layer below. Correct Answers 1
A 150 by 300 mm (6 by 12 in) cylinder mold can be used for
concrete containing aggregate with particles not exceeding
___________ in size, without the need for wet sieving the
concrete. Correct Answers 50 mm
A composite sample of concrete is required even if the only
purpose for obtaining the sample is to determine temperature?
true or false Correct Answers false
A mallet weighing _______________ must be used to tap the
sides of the bowl after rodding each layer (air content) Correct
Answers 600 +/- 200 g (1.25 +/- .5 lbs)
A maximum temperature of freshly mixed concrete is specified
in C1064/1064M. true or false Correct Answers false
A plastic container can be used for gravimetric method. T or F
Correct Answers false (steel)
, According to Test Method C1064/1064M, what is one reason to
take the temperature of concrete? Correct Answers verify
conformance to specified requirements
After completing the strike off procedure what must be done
before weighing the measure and sample? Correct Answers
clean off exterior of measure
After consolidation of the final layer an excess of concrete
______ above the top of the measure is considered optimum.
Correct Answers 3 mm (⅛ in)
After molding test specimens, you should wait two hours before
moving them to the location of initial storage. True or False?
Correct Answers false (immediately)
After rodding each layer 25 times what must be done for
pressure method? Correct Answers tap the sides 10-15 times
with mallet
After the final rodding, the sides of the slump mold should be
tapped with your tamping rod? T or F? Correct Answers false
After the temperature of the concrete is read, what is then
required? Correct Answers report the temp
Air meters used for gravimetric method must conform to
astm______ and be calibrated for volume according to
astm_____. Correct Answers C231, C29/C29m
