ACI Aggregate Testing Technician -
Level 2 Exam with Complete Solutions
AASHTO T 96 LA Machine Small-Size Course Agg.
1. In this test "small-size" coarse aggregate is considered to be aggregate smaller than
19 mm (3/4 in.). True or False? - ANS-False, 1½ in.
AASHTO T 96 LA Machine Small-Size Course Agg.
2. The aggregate tested in the Los Angeles Machine is subjected to such actions as
_________, ________., ________., and ________ - ANS-Abrasion, attrition, impact,
grinding.
AASHTO T 96 LA Machine Small-Size Course Agg.
3. What promotes the degradation of the aggregates in the rotating steel drum? - ANS-
Steel spheres
AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of aggregates composed of
similar _________ - ANS-Quality or competence; minerals
AASHTO T 96 LA Machine Small-Size Course Agg.
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. -
ANS-Steel cylinder; cover; removable steel
AASHTO T 96 LA Machine Small-Size Course Agg.
6. A shelf of wear-resistant steel, rectangular in cross section, and mounted on the
cover, is preferred. True or False? - ANS-False, a shelf mounted independently of the
cover is preferred.
AASHTO T 96 LA Machine Small-Size Course Agg.
7. A _________ , __________ speed must be maintained. - ANS-Uniform, peripheral
AASHTO T 96 LA Machine Small-Size Course Agg.
,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? - ANS-False; they should average 46.8 mm (1-27/32 in.) and have a
mass between 390 and 445 g.
AASHTO T 96 LA Machine Small-Size Course Agg.
9. If grading B is used, ____ spheres are needed. - ANS-11
AASHTO T 96 LA Machine Small-Size Course Agg.
10. After the test sample and steel spheres are in the machine, rotate the drum at __ to
__ r/min. for ____ revolutions. - ANS-30-33 r/min for 500 revolutions.
AASHTO T 96 LA Machine Small-Size Course Agg.
11. After the required revolutions, separate the material using a ______________ -
ANS-1.70 mm sieve (No. 12 sieve)
AASHTO T 96 LA Machine Small-Size Course Agg.
12. The _______ material that remains after sieving, should be oven-dried to ______ -
ANS-Coarse; substantially constant mass
AASHTO T 96 LA Machine Small-Size Course Agg.
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? - ANS-
True
AASHTO T 96 LA Machine Small-Size Course Agg.
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. - ANS-Original mass
AASHTO T 96 LA Machine Small-Size Course Agg.
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. -
ANS-12.7
ASTM C535 LA Machine Large-Size Course Agg.
, 1. This test method covers all aggregate larger than 10 mm (3/8 in.). True or False? -
ANS-False; larger than 19 mm (3/4 in.)
ASTM C535 LA Machine Large-Size Course Agg.
2. This test relies on the rotation of a ______ drum containing 12 ______ spheres to
abrade and grind aggregate. - ANS-Steel; steel
ASTM C535 LA Machine Large-Size Course Agg.
3. The number of revolutions of the drum is immaterial providing that the operator runs
the machine for 30 min. True or False? - ANS-False, the number of revolutions is
prescribed to provide valid test results.
ASTM C535 LA Machine Large-Size Course Agg.
4. This test indicates the relative __________ or __________ of different aggregate
sources which have similar mineral composition. - ANS-Quality; Competence
ASTM C535 LA Machine Large-Size Course Agg.
5. Since aggregate sources may differ in origin, composition, and structure, valid
comparisons of results _________________________________ - ANS-Cannot be
automatically made.
ASTM C535 LA Machine Large-Size Course Agg.
6. Charges should consist of ____ steel spheres totaling ________ g. - ANS-12; 5000 ±
25 g
ASTM C535 LA Machine Large-Size Course Agg.
7. A combination of steel ball bearings _________, __________, and ________ in
diameter may be used in the charge. - ANS-46.0 mm (1-13/16 in.); 47.6 mm (1-7/8 in.);
46.8 mm (1-27/32 in.)
ASTM C535 LA Machine Large-Size Course Agg.
8. Washing the test sample is optional if it isn't covered with dust or other materials.
True or False? - ANS-True
ASTM C535 LA Machine Large-Size Course Agg.
9. Rotate the machine at 30 to 33 revolutions per minute for _____ revolutions. - ANS-
1000
Level 2 Exam with Complete Solutions
AASHTO T 96 LA Machine Small-Size Course Agg.
1. In this test "small-size" coarse aggregate is considered to be aggregate smaller than
19 mm (3/4 in.). True or False? - ANS-False, 1½ in.
AASHTO T 96 LA Machine Small-Size Course Agg.
2. The aggregate tested in the Los Angeles Machine is subjected to such actions as
_________, ________., ________., and ________ - ANS-Abrasion, attrition, impact,
grinding.
AASHTO T 96 LA Machine Small-Size Course Agg.
3. What promotes the degradation of the aggregates in the rotating steel drum? - ANS-
Steel spheres
AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of aggregates composed of
similar _________ - ANS-Quality or competence; minerals
AASHTO T 96 LA Machine Small-Size Course Agg.
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. -
ANS-Steel cylinder; cover; removable steel
AASHTO T 96 LA Machine Small-Size Course Agg.
6. A shelf of wear-resistant steel, rectangular in cross section, and mounted on the
cover, is preferred. True or False? - ANS-False, a shelf mounted independently of the
cover is preferred.
AASHTO T 96 LA Machine Small-Size Course Agg.
7. A _________ , __________ speed must be maintained. - ANS-Uniform, peripheral
AASHTO T 96 LA Machine Small-Size Course Agg.
,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? - ANS-False; they should average 46.8 mm (1-27/32 in.) and have a
mass between 390 and 445 g.
AASHTO T 96 LA Machine Small-Size Course Agg.
9. If grading B is used, ____ spheres are needed. - ANS-11
AASHTO T 96 LA Machine Small-Size Course Agg.
10. After the test sample and steel spheres are in the machine, rotate the drum at __ to
__ r/min. for ____ revolutions. - ANS-30-33 r/min for 500 revolutions.
AASHTO T 96 LA Machine Small-Size Course Agg.
11. After the required revolutions, separate the material using a ______________ -
ANS-1.70 mm sieve (No. 12 sieve)
AASHTO T 96 LA Machine Small-Size Course Agg.
12. The _______ material that remains after sieving, should be oven-dried to ______ -
ANS-Coarse; substantially constant mass
AASHTO T 96 LA Machine Small-Size Course Agg.
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? - ANS-
True
AASHTO T 96 LA Machine Small-Size Course Agg.
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. - ANS-Original mass
AASHTO T 96 LA Machine Small-Size Course Agg.
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. -
ANS-12.7
ASTM C535 LA Machine Large-Size Course Agg.
, 1. This test method covers all aggregate larger than 10 mm (3/8 in.). True or False? -
ANS-False; larger than 19 mm (3/4 in.)
ASTM C535 LA Machine Large-Size Course Agg.
2. This test relies on the rotation of a ______ drum containing 12 ______ spheres to
abrade and grind aggregate. - ANS-Steel; steel
ASTM C535 LA Machine Large-Size Course Agg.
3. The number of revolutions of the drum is immaterial providing that the operator runs
the machine for 30 min. True or False? - ANS-False, the number of revolutions is
prescribed to provide valid test results.
ASTM C535 LA Machine Large-Size Course Agg.
4. This test indicates the relative __________ or __________ of different aggregate
sources which have similar mineral composition. - ANS-Quality; Competence
ASTM C535 LA Machine Large-Size Course Agg.
5. Since aggregate sources may differ in origin, composition, and structure, valid
comparisons of results _________________________________ - ANS-Cannot be
automatically made.
ASTM C535 LA Machine Large-Size Course Agg.
6. Charges should consist of ____ steel spheres totaling ________ g. - ANS-12; 5000 ±
25 g
ASTM C535 LA Machine Large-Size Course Agg.
7. A combination of steel ball bearings _________, __________, and ________ in
diameter may be used in the charge. - ANS-46.0 mm (1-13/16 in.); 47.6 mm (1-7/8 in.);
46.8 mm (1-27/32 in.)
ASTM C535 LA Machine Large-Size Course Agg.
8. Washing the test sample is optional if it isn't covered with dust or other materials.
True or False? - ANS-True
ASTM C535 LA Machine Large-Size Course Agg.
9. Rotate the machine at 30 to 33 revolutions per minute for _____ revolutions. - ANS-
1000
