ACI AGGREGATE TESTING TECHNICIAN LEVEL 2 | QUESTIONS AND
ANSWERS | VERIFIED ANSWERS (100% CORRECT) | LATEST EXAM
UPDATE
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
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.
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.
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
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. - CORRECT ANSWER - 12
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?
- CORRECT ANSWER - 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. - CORRECT ANSWER - 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? - CORRECT ANSWER - False, the
number of revolutions is prescribed to provide valid test results.
ANSWERS | VERIFIED ANSWERS (100% CORRECT) | LATEST EXAM
UPDATE
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
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.
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.
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
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. - CORRECT ANSWER - 12
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?
- CORRECT ANSWER - 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. - CORRECT ANSWER - 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? - CORRECT ANSWER - False, the
number of revolutions is prescribed to provide valid test results.
