ACI AGGREGATE TESTING
TECHNICIAN - LEVEL 2
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? - ANSWERS-
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 ________ -
ANSWERS-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? - ANSWERS-Steel spheres
AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of
aggregates composed of similar _________ - ANSWERS-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. - ANSWERS-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? - ANSWERS-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. -
ANSWERS-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? - ANSWERS-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. - ANSWERS-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. - ANSWERS-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
______________ - ANSWERS-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 ______ - ANSWERS-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? - ANSWERS-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. - ANSWERS-
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. - ANSWERS-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? - ANSWERS-False; larger than 19 mm (3/4 in.)
ASTM C535 LA Machine Large-Size Course Agg.
TECHNICIAN - LEVEL 2
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? - ANSWERS-
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 ________ -
ANSWERS-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? - ANSWERS-Steel spheres
AASHTO T 96 LA Machine Small-Size Course Agg.
4. This test indicates the relative _________ or __________ of
aggregates composed of similar _________ - ANSWERS-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. - ANSWERS-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? - ANSWERS-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. -
ANSWERS-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? - ANSWERS-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. - ANSWERS-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. - ANSWERS-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
______________ - ANSWERS-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 ______ - ANSWERS-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? - ANSWERS-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. - ANSWERS-
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. - ANSWERS-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? - ANSWERS-False; larger than 19 mm (3/4 in.)
ASTM C535 LA Machine Large-Size Course Agg.
