ASTM D75 QUESTIONS AND ANSWERS
D75
When sampling from the conveyor belt, obtain at least _____ approximately equal
increments selected at random. - Answers :Three (Section 5.3.2)
D75
True or False? When sampling from the conveyor belt, stop the conveyor belt while the
sample increments are being obtained. - Answers :True (Section 5.3.2)
D75
For combined coarse and fine aggregates, the minimum weight shall be coarse
aggregate minimum mass plus _____. - Answers :10 kg. (Table 1, page 6, Note B)
D75
True or False? When site-specific techniques or procedures are developed for sampling
stockpile, those procedures shall not supersede the procedures given in ASTM D75. -
Answers :False (Section 5.3.3)
D75
True or False? Always sample coarse aggregate or mixed coarse and fine aggregate
from stockpiles whenever possible, particularly when the sampling is done for the
purpose of determining aggregate properties that may be dependent upon the grading
of the sample. - Answers :False; avoid sampling (Section 5.3.3)
D75
When sampling from a flowing aggregate stream (bins or belt discharge), obtain at least
______ approximately equal increments, selected at random from the unit being
samples, and combine to form a field sample. - Answers :3 (Section 5.3.1)
Nominal maximum aggregate size (Superpave) - Answers :one size larger than the first
sieve that retains more than 10% aggregate
Maximum aggregate size (Superpave) - Answers :one size larger than the nominal
maximum aggregate size
D75
Samples for preliminary investigation tests are obtained by what party? - Answers :the
party responsible for development of the potential source
D75
Samples of materials for control of the production at the source or control of the work at
the site of use are obtained by whom? - Answers :the manufacturer, contractor, or other
parties responsible for accomplishing the work
D75
, Samples for tests to be used in acceptance or rejection decisions by the purchaser are
obtained by? - Answers :the purchaser or his authorized representative
D75
The _____ shall provide suitable equipment needed for proper inspection and sampling.
- Answers :Seller
D75
This practice covers sampling of coarse and fine aggregate for what purposes? -
Answers :preliminary investigation of the potential source of supply; control of the
product at the source of supply; control of the operation at the site of use; acceptance or
rejection of the materials
D75
What is the smallest sieve opening through which the entire amount of aggregate is
required to pass called? - Answers :Maximum size (of aggregate)
D75
What is the smallest sieve opening through which the entire amount of the aggregate is
permitted to pass called? - Answers :Nominal maximum size (of aggregate)
D75
What is the preferred method of sampling? - Answers :Sampling from stockpiles with
Power equipment. (Section 5.3.3.1)
D75
When obtaining a sample from a stockpile, a loader shall enter the stockpile with the
bucket approximately ____ above ground level. - Answers :150 mm [6 in.] (Section
5.3.3.1 (1) )
D75
What must the loader never do when gathering a sample from a stockplie? - Answers
:Never allowing the front tires to ramp up on the pile. (Section 5.3.3.1 (1) )
D75
What must be done after re-blending and creating a small sampling pile at the base of
the stockpile. - Answers :Without the tires entering the pile, lower the bucket to about
half the height of the pile and backup, making a flat surface for sampling. (Section
5.3.3.1 (4) )
D75
Samples for tests to be used in acceptance or rejection decisions by the purchaser are
obtained by the _____ or his _____ ______. - Answers :purchaser; authorized
representative (Section 4.2)
D75
D75
When sampling from the conveyor belt, obtain at least _____ approximately equal
increments selected at random. - Answers :Three (Section 5.3.2)
D75
True or False? When sampling from the conveyor belt, stop the conveyor belt while the
sample increments are being obtained. - Answers :True (Section 5.3.2)
D75
For combined coarse and fine aggregates, the minimum weight shall be coarse
aggregate minimum mass plus _____. - Answers :10 kg. (Table 1, page 6, Note B)
D75
True or False? When site-specific techniques or procedures are developed for sampling
stockpile, those procedures shall not supersede the procedures given in ASTM D75. -
Answers :False (Section 5.3.3)
D75
True or False? Always sample coarse aggregate or mixed coarse and fine aggregate
from stockpiles whenever possible, particularly when the sampling is done for the
purpose of determining aggregate properties that may be dependent upon the grading
of the sample. - Answers :False; avoid sampling (Section 5.3.3)
D75
When sampling from a flowing aggregate stream (bins or belt discharge), obtain at least
______ approximately equal increments, selected at random from the unit being
samples, and combine to form a field sample. - Answers :3 (Section 5.3.1)
Nominal maximum aggregate size (Superpave) - Answers :one size larger than the first
sieve that retains more than 10% aggregate
Maximum aggregate size (Superpave) - Answers :one size larger than the nominal
maximum aggregate size
D75
Samples for preliminary investigation tests are obtained by what party? - Answers :the
party responsible for development of the potential source
D75
Samples of materials for control of the production at the source or control of the work at
the site of use are obtained by whom? - Answers :the manufacturer, contractor, or other
parties responsible for accomplishing the work
D75
, Samples for tests to be used in acceptance or rejection decisions by the purchaser are
obtained by? - Answers :the purchaser or his authorized representative
D75
The _____ shall provide suitable equipment needed for proper inspection and sampling.
- Answers :Seller
D75
This practice covers sampling of coarse and fine aggregate for what purposes? -
Answers :preliminary investigation of the potential source of supply; control of the
product at the source of supply; control of the operation at the site of use; acceptance or
rejection of the materials
D75
What is the smallest sieve opening through which the entire amount of aggregate is
required to pass called? - Answers :Maximum size (of aggregate)
D75
What is the smallest sieve opening through which the entire amount of the aggregate is
permitted to pass called? - Answers :Nominal maximum size (of aggregate)
D75
What is the preferred method of sampling? - Answers :Sampling from stockpiles with
Power equipment. (Section 5.3.3.1)
D75
When obtaining a sample from a stockpile, a loader shall enter the stockpile with the
bucket approximately ____ above ground level. - Answers :150 mm [6 in.] (Section
5.3.3.1 (1) )
D75
What must the loader never do when gathering a sample from a stockplie? - Answers
:Never allowing the front tires to ramp up on the pile. (Section 5.3.3.1 (1) )
D75
What must be done after re-blending and creating a small sampling pile at the base of
the stockpile. - Answers :Without the tires entering the pile, lower the bucket to about
half the height of the pile and backup, making a flat surface for sampling. (Section
5.3.3.1 (4) )
D75
Samples for tests to be used in acceptance or rejection decisions by the purchaser are
obtained by the _____ or his _____ ______. - Answers :purchaser; authorized
representative (Section 4.2)
D75
