ACI Concrete Exam Questions And Answers Graded A+
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
Rod each layer ___ times uniformly over ...
ACI Concrete Exam Questions And Answers
Graded A+
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
Rod each layer ___ times uniformly over the cross section with the rounded end of the rod.
25
The slump mold is filled in _____ layers.
3 layers
True or false the slump mold should be in a dry condition before beginning the test?
False.
For use in the slump test, the tamping end on both ends of the tamping rod must be...
Rounded to a hemispherical tip
True or false the Anterior surface of the slump mold is allowed to have minor irregularities?
False
The mold for making the slump test is in the shape of
The frustum of a cone
What is the maximum allowable time between obtaining the first and final portion of the composite
samples?
15 minutes
True or false the sample of concrete used for temperature determination must be rodded 25 time?
False
What is the required shape of the tamping end of the tamping rod?
Rounded to a hemispherical tip
Is 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.
True or false after the final rodding, the sides of the slump should be tapped lightly with the tamping
rod
False
Prior to lifting the mold, concrete must be removed from _____.
the area surrounding the base
, If rodding is the method of consolidation being used, the measure must be filled in how many layers?
3
For a measure of 14 L [0.5 ft^3], what is the required number of strokes of the tamping rod for
consolidation of each layer?
25
When rodding the middle and top layers, the tamping rod should penetrate into the layer below
approximately how deep
1" or 25mm
The end of the temperature sampling portion of the temperature measuring device is submerged a
minimum of _____ into the freshly a mixed concrete
3"
After the temperature of the concrete is read, what is then required?
Report the temperature
What must be done to the concrete surrounding the temperature measuring device after the device is
submerged in the fresh concrete?
Gently press the concrete around the device to prevent air from impacting the temperature read.
What must be done to the sample container prior to sampling the concrete?
Dampen (with water)
True or false the temperature of concrete may be measured in a wheelbarrow
True
The temperature of the concrete is reported to the nearest
Degree
The direct reading of the final liquid level in the neck of the air meter, Is estimated to the nearest
0.25%
True or false it is necessary to tap the sides of the measuring bowl after each layer has been rodded
True
What must be done if there is a slight deficiency in the quantity of concrete in the measure following
consolidation of the final layer?
Add a small quantity of representative concrete before strike off
What tools may be used to strike off the top surface of the concrete following consolidation of the
final layer?
A strike-off bar; a metal, glass, or acrylic plate
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