ACI Aggregate Testing Technician Level 2 Certification 2026/2027 | Advanced Aggregate Testing Exam Prep

ACI Aggregate Testing Technician - Level 2 Exam




AASHTO T 96 LA Machine Small-Size Course Agg. Quality or competence; minerals


4. This test indicates the relative _________ or __________ of
aggregates composed of similar _________


AASHTO T 96 LA Machine Small-Size Course Agg. Steel cylinder; cover; removable steel


5. The Los Angeles Machine consists of a hollow
____________, with an opening for the introduction of the
test sample, a dust-tight ______, and a ___________ shelf.


AASHTO T 96 LA Machine Small-Size Course Agg. False, a shelf mounted independently of the cover is preferred.


6. A shelf of wear-resistant steel, rectangular in cross
section, and mounted on the cover, is preferred. True or
False?


AASHTO T 96 LA Machine Small-Size Course Agg. Uniform, peripheral


7. A _________ , __________ speed must be maintained.


AASHTO T 96 LA Machine Small-Size Course Agg. False; they should average 46.8 mm (1-27/32 in.) and have a mass
between 390 and 445 g.


8. The steel spheres should be 31.8 mm (1-1/4 in.) in
diameter and have a mass of 320 g. True or False?


AASHTO T 96 LA Machine Small-Size Course Agg. 11


9. If grading B is used, ____ spheres are needed.


AASHTO T 96 LA Machine Small-Size Course Agg. 30-33 r/min for 500 revolutions.


10. After the test sample and steel spheres are in the
machine, rotate the drum at __ to __ r/min. for ____
revolutions.


AASHTO T 96 LA Machine Small-Size Course Agg. 1.70 mm sieve (No. 12 sieve)


11. After the required revolutions, separate the material
using a ______________


AASHTO T 96 LA Machine Small-Size Course Agg. Coarse; substantially constant mass


12. The _______ material that remains after sieving, should
be oven-dried to ______

, ACI Aggregate Testing Technician - Level 2 Exam



AASHTO T 96 LA Machine Small-Size Course Agg. True


13. Computing the ratio of loss after 100 revolutions to
the loss after 500, may offer valuable information
regarding the uniformity of the test sample. True or
False?


AASHTO T 96 LA Machine Small-Size Course Agg. Original mass


14. The difference between the original mass of the test
sample and the final mass should be reported as a
percent of the ___________________ . This is the percent loss.


AASHTO T 96 LA Machine Small-Size Course Agg. 12.7


15. The results of properly conducted tests run by
different laboratories on the same coarse aggregates
are not expected to differ by more than ____ % of their
average.


ASTM C535 LA Machine Large-Size Course Agg. False; larger than 19 mm (3/4 in.)


1. This test method covers all aggregate larger than 10
mm (3/8 in.). True or False?


ASTM C535 LA Machine Large-Size Course Agg. Steel; steel


2. This test relies on the rotation of a ______ drum
containing 12 ______ spheres to abrade and grind
aggregate.


ASTM C535 LA Machine Large-Size Course Agg. False, the number of revolutions is prescribed to provide valid test
results.
3. The number of revolutions of the drum is immaterial
providing that the operator runs the machine for 30
min. True or False?


ASTM C535 LA Machine Large-Size Course Agg. Quality; Competence


4. This test indicates the relative __________ or __________ of
different aggregate sources which have similar mineral
composition.


ASTM C535 LA Machine Large-Size Course Agg. Cannot be automatically made.


5. Since aggregate sources may differ in origin,
composition, and structure, valid comparisons of results
_________________________________


ASTM C535 LA Machine Large-Size Course Agg. 12; 5000 ± 25 g


6. Charges should consist of ____ steel spheres totaling
________ g.

, ACI Aggregate Testing Technician - Level 2 Exam




ASTM C535 LA Machine Large-Size Course Agg. 46.0 mm (1-13/16 in.); 47.6 mm (1-7/8 in.); 46.8 mm (1-27/32 in.)


7. A combination of steel ball bearings _________, __________,
and ________ in diameter may be used in the charge.


ASTM C535 LA Machine Large-Size Course Agg. True


8. Washing the test sample is optional if it isn't covered
with dust or other materials. True or False?


ASTM C535 LA Machine Large-Size Course Agg. 1000


9. Rotate the machine at 30 to 33 revolutions per minute
for _____ revolutions.


ASTM C535 LA Machine Large-Size Course Agg. False, use a sieve coarser than a 1.70 mm (No. 12) sieve.


10. After running the material through the machine,
sieve the entire sample in a 1.70 mm (No. 12) sieve. True
or False?


ASTM C535 LA Machine Large-Size Course Agg. 200; 1000


11. A comparison of the loss after ____ revolutions with
the loss after _____ revolutions may confirm the
uniformity of the test sample.


ASTM C535 LA Machine Large-Size Course Agg. 0.20


12. The ratio of the above loss should not significantly
exceed ____ for material of uniform hardness.


ASTM C535 LA Machine Large-Size Course Agg. Original; Final; 1%


13. Calculate the difference between the ________ mass
and the ______ mass of the test sample, and report to the
nearest ___% by mass.


ASTM C535 LA Machine Large-Size Course Agg. Repaired; Replaced


14. The shelf of the Los Angeles Machine should be
_________ or _________ if it becomes bent.