ACI Concrete Field Testing Exam
Questions and Answers with Verified
Solutions | Latest Updated 2026
ASTM 172 Describes procedures for obtaining
samples of fresh concrete for plastic
properties testing and casting
strength specimens
QA Program Testing performed by the owner,
verifies QC
QC Programs Testing performed by the contractor
ASTM 172 includes sampling Stationary Mixers (central mixers)
from Paving and truck mixers Agitating
and non-agitating equipment
Continuous mixers (volumetric)
Composite sample Two or more portions of concrete
obtained generally from the middle
portion of the batch The portions of
concrete should be spaced or timed
separating them at equal intervals
If casting strength specimens, 1 cubic foot or roughly half a wheel
need this much concrete barrow
What must be done when an Wet sieve
aggregate is too large for
, testing equipment?
Nominal Maximum Aggregate Smallest specified sieve in which
Size 100% of the material is allowed to
pass
Composite sampling time limit Time between the first and final
portion of the composite sample
shall not exceed 15 minutes
Cover the sample To protect it from Sun, wind,
contamination and rapid
evaporation
Plasticity testing time limit Begin tests for temp, slump and air
within 5 minutes after obtaining the
final portion of the composite
sample
Compressive strength testing Begin casting strength test
time limit specimens within 15 minutes after
fabricating the composite sample
Cylinders Beams Prisms
Sampling should normally be on concrete as it is delivered to the
performed project site and after all water and
admixtures have been added Some
spec may require sampling from
other points such as the point of
discharge of a pump
Procedure for stationary two or more regularly spaced
mixers (plant) intervals middle portion of the batch
Questions and Answers with Verified
Solutions | Latest Updated 2026
ASTM 172 Describes procedures for obtaining
samples of fresh concrete for plastic
properties testing and casting
strength specimens
QA Program Testing performed by the owner,
verifies QC
QC Programs Testing performed by the contractor
ASTM 172 includes sampling Stationary Mixers (central mixers)
from Paving and truck mixers Agitating
and non-agitating equipment
Continuous mixers (volumetric)
Composite sample Two or more portions of concrete
obtained generally from the middle
portion of the batch The portions of
concrete should be spaced or timed
separating them at equal intervals
If casting strength specimens, 1 cubic foot or roughly half a wheel
need this much concrete barrow
What must be done when an Wet sieve
aggregate is too large for
, testing equipment?
Nominal Maximum Aggregate Smallest specified sieve in which
Size 100% of the material is allowed to
pass
Composite sampling time limit Time between the first and final
portion of the composite sample
shall not exceed 15 minutes
Cover the sample To protect it from Sun, wind,
contamination and rapid
evaporation
Plasticity testing time limit Begin tests for temp, slump and air
within 5 minutes after obtaining the
final portion of the composite
sample
Compressive strength testing Begin casting strength test
time limit specimens within 15 minutes after
fabricating the composite sample
Cylinders Beams Prisms
Sampling should normally be on concrete as it is delivered to the
performed project site and after all water and
admixtures have been added Some
spec may require sampling from
other points such as the point of
discharge of a pump
Procedure for stationary two or more regularly spaced
mixers (plant) intervals middle portion of the batch
