ACI Concrete Field Testing Technician - Grade 1 Questions with Answers

ACI Concrete Field Testing Technician - Grade 1 Questions with
Answers
Question 1
What is the specified slump below which a vibrator must be used for consolidation?____
Correct Answer
40mm or less



Question 2
For a 7L air bucket measure, what is the required number of strokes of the tamping rod for consolidation of each layer?
_____
Correct Answer
25



Question 3
What is the time limit for completion of sampling?
Correct Answer
10 minutes




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,Question 4
A piece of reinforcing stell makes a good tamping rod. True or False?
Correct Answer
False



Question 5
The test for temperature must be completed in how many minutes after obtaining the sample?
Correct Answer
5 minutes



Question 6
The sensor of the temperature measuring device shall have at leat ___mm of concrete cover in all directions
Correct Answer
77 mm (and three times maximum aggregate size/)



Question 7
The tamping rod must be a round, straight steel rod with a diameter of ___mm for the standard 100mm diameter cylinders
Correct Answer
10




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,Question 8
Only cylinders or flexural beams which have been kept on site under temperature and moisture conditions similar to that
received by in-place concrete may be used to assess form removal, in-service or post-tensioning times. True or False?
Correct Answer
Ture; if other non-destructive test are not used



Question 9
D=
Correct Answer
2318kg/m^3(above)



Question 10
When rodding the concrete sample in a 7L bowl, what is the specified number to strokes required for each layer?____
Correct Answer
25



Question 11
what must be done if there is a slight deficiency in the quality of concrete in the measure following consolidation of the
final layer?_____
Correct Answer
add small quantity of concrete with the scoop before strike-off




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, Question 12
On a warm, dry , windy day, what would be expected to happen to the thermometer reading if the thermometer is
extracted from the concrete by the technicians before the concrete temperature reading has been recoreded?
Correct Answer
Tempreature reading will rapidly drop below ambient because of rapid evaportion of water from shaft of thermometer.
Aways read temperature while thermometer is still in the concrete.



Question 13
When the concrete contains aggregate larger than allowed for slump test, what must be done to the concrete sample?_____

Correct Answer
Wet sieve over 40mm sive



Question 14
The height of the slump cone is____mm
Correct Answer
300



Question 15
If, at any time while rodding the top layer, the concrete drops below the top of the slump cone, what should be done?
Correct Answer
Add additional concrete to overfill cone




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