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ACI Aggregate Testing Technician - Level
2 | Comprehensive Questions And
Answers
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? - correct-answer -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 ________ - correct-answer -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? -
correct-answer -Steel spheres
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AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of aggregates
composed of similar _________ - correct-answer -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. - correct-answer -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? - correct-answer -False, a shelf mounted
independently of the cover is preferred.
AASHTO T 96 LA Machine Small-Size Course Agg.
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7. A _________ , __________ speed must be maintained. - correct-answer -
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? - correct-answer -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. - correct-answer -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. - correct-answer -30-33 r/min for 500
revolutions.
AASHTO T 96 LA Machine Small-Size Course Agg.
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11. After the required revolutions, separate the material using a ______________
- correct-answer -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
______ - correct-answer -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? - correct-answer -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. - correct-answer -Original mass
ACI Aggregate Testing Technician - Level
2 | Comprehensive Questions And
Answers
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? - correct-answer -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 ________ - correct-answer -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? -
correct-answer -Steel spheres
,2|Page
AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of aggregates
composed of similar _________ - correct-answer -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. - correct-answer -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? - correct-answer -False, a shelf mounted
independently of the cover is preferred.
AASHTO T 96 LA Machine Small-Size Course Agg.
,3|Page
7. A _________ , __________ speed must be maintained. - correct-answer -
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? - correct-answer -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. - correct-answer -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. - correct-answer -30-33 r/min for 500
revolutions.
AASHTO T 96 LA Machine Small-Size Course Agg.
, 4|Page
11. After the required revolutions, separate the material using a ______________
- correct-answer -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
______ - correct-answer -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? - correct-answer -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. - correct-answer -Original mass
