ACI AGGREGATE TESTING TECHNICIAN
EXAM QUESTIONS AND ANSWERS 100
PERCENT PASS ACTUAL EVALUATION
PAPER QUESTIONS WITH ANSWERS
GRADED A+
⩥ 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 ________. 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?. Answer: Steel spheres
⩥ AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of
aggregates composed of similar _________. 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.. 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?. Answer: 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.. 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?. 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.. 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.. Answer: 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
______________. 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 ______. 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?. 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.. Answer: 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.. Answer: 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?. Answer: False; larger than 19 mm (3/4 in.)
⩥ ASTM C535 LA Machine Large-Size Course Agg.
EXAM QUESTIONS AND ANSWERS 100
PERCENT PASS ACTUAL EVALUATION
PAPER QUESTIONS WITH ANSWERS
GRADED A+
⩥ 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 ________. 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?. Answer: Steel spheres
⩥ AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of
aggregates composed of similar _________. 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.. 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?. Answer: 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.. 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?. 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.. 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.. Answer: 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
______________. 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 ______. 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?. 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.. Answer: 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.. Answer: 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?. Answer: False; larger than 19 mm (3/4 in.)
⩥ ASTM C535 LA Machine Large-Size Course Agg.
