1
ACI Concrete
ACI Concrete Field - Testing Technician Grade
1 | Exam | Questions & Answers | Grade A|
100% Correct | (NEW 2025/ 2026)
What should you do to your container before obtaining a concrete sample? - ANS
✓Dampen container
Sampling method for composite sample? - ANS ✓Minimum two samples from middle
portion of the load
What is the maximum time limit between obtaining the first and final portions of the
composite mixture? - ANS ✓15min
How do you obtain the composite sample from a concrete truck? - ANS ✓Divert the
entire discharge stream into sample container
How do you obtain a sample from concrete pavers? - ANS ✓Sample from a minimum of
5 locations after it has been discharged
What is the minimum sample size to be used for strength tests? - ANS ✓1 cubic foot
What should you do as soon as you obtain the concrete sample?(Before starting tests) -
ANS ✓Move as close as possible to where samples are to be molded
From what do concrete samples need to be protected from? - ANS ✓Sun, wind, and
other sources of rapid evaporation. Keep away from vibrations and construction activity
ACI Concrete
, 2
ACI Concrete
What must you do after brining concrete sample to your test location but before testing
begins? - ANS ✓Remix thoroughly with a shovel
When must you start tests for temperature, slump, and air? - ANS ✓Within 5min of
obtaining final portion of composite sample
When must molding of samples begin? - ANS ✓Within 15min of obtaining final portion
of composite sample
How do you obtain a sample from a stationary mixer? - ANS ✓Pass the receptacle
completely through the discharge stream
If concrete aggregate is larger than the allowable size for molds what must you do? -
ANS ✓Wet sieve, except for unit weight tests
After wet sieving what should you do? - ANS ✓Remix sample with a shovel
What is the maximum size aggregate allowed for slump tests and what must you do if it
is larger? - ANS ✓1-1/2", wet seive
How many layers by volume is a slump cone filled? - ANS ✓3 layers
What must you do with slump cone before performing slump test? - ANS ✓Ensure there
is no concrete build up or dents in the mold and dampen mold before filling with
concrete
Where must slump test be performed? - ANS ✓On a level surface away from vibrations
How large is the rod used for performing slump tests? - ANS ✓5/8" diameter and at
least 4in taller than slump cone but not longer than 24in
ACI Concrete
ACI Concrete
ACI Concrete Field - Testing Technician Grade
1 | Exam | Questions & Answers | Grade A|
100% Correct | (NEW 2025/ 2026)
What should you do to your container before obtaining a concrete sample? - ANS
✓Dampen container
Sampling method for composite sample? - ANS ✓Minimum two samples from middle
portion of the load
What is the maximum time limit between obtaining the first and final portions of the
composite mixture? - ANS ✓15min
How do you obtain the composite sample from a concrete truck? - ANS ✓Divert the
entire discharge stream into sample container
How do you obtain a sample from concrete pavers? - ANS ✓Sample from a minimum of
5 locations after it has been discharged
What is the minimum sample size to be used for strength tests? - ANS ✓1 cubic foot
What should you do as soon as you obtain the concrete sample?(Before starting tests) -
ANS ✓Move as close as possible to where samples are to be molded
From what do concrete samples need to be protected from? - ANS ✓Sun, wind, and
other sources of rapid evaporation. Keep away from vibrations and construction activity
ACI Concrete
, 2
ACI Concrete
What must you do after brining concrete sample to your test location but before testing
begins? - ANS ✓Remix thoroughly with a shovel
When must you start tests for temperature, slump, and air? - ANS ✓Within 5min of
obtaining final portion of composite sample
When must molding of samples begin? - ANS ✓Within 15min of obtaining final portion
of composite sample
How do you obtain a sample from a stationary mixer? - ANS ✓Pass the receptacle
completely through the discharge stream
If concrete aggregate is larger than the allowable size for molds what must you do? -
ANS ✓Wet sieve, except for unit weight tests
After wet sieving what should you do? - ANS ✓Remix sample with a shovel
What is the maximum size aggregate allowed for slump tests and what must you do if it
is larger? - ANS ✓1-1/2", wet seive
How many layers by volume is a slump cone filled? - ANS ✓3 layers
What must you do with slump cone before performing slump test? - ANS ✓Ensure there
is no concrete build up or dents in the mold and dampen mold before filling with
concrete
Where must slump test be performed? - ANS ✓On a level surface away from vibrations
How large is the rod used for performing slump tests? - ANS ✓5/8" diameter and at
least 4in taller than slump cone but not longer than 24in
ACI Concrete
