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ASTM D-75; AASHTO T-2
Standard Practice for Sampling Aggregates
29
Other
Professional
04/12/2013

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Term
ASTM D-75
Definition
Standard Practice for Sampling Aggregates
Term
AASHTO T-2
Definition
Standard Practice for Sampling Aggregates
Term
Standard Practice for Sampling Aggregates
Definition
ASTM D-75 or AASHTO T-2
Term
Definition of Maximum size of aggregate
Definition
The smallest sieve opening through which the entire amount of aggregate is REQUIRED to pass.
Term
Definition of Maximum aggregate size (superpave)
Definition
one size larger than the nominal maximum aggregate size.
Term
Definition of Nominal maximum aggregate size (of aggregate)
Definition
The smallest sieve opening through which the entire amount of the aggregate is PERMITTED to pass.
Term
Definition of Nominal maximum aggregate size (superpave)
Definition
One size larger than the first sieve that retains more than 10% aggregate.
Term
When obtaining samples for testing the sampler shall...
Definition
Use every precaution to obtain samples that will show the nature and condition of the materials which they represent.
Term
ASTM - Who is responsible for obtaining the samples for preliminary investigation test?
Definition
The party responsible for development of the potential source.
Term
ASTM - Who is responsible for obtaining the samples for control of the production?
Definition
The manufacturer, contractor or other parties responsible for accomplishing the work.
Term
ASTM - Who is responsible for obtaining the samples for test to be used in acceptance or rejection decisions by the purchaser?
Definition
The purchaser or their authorized representative.
Term
AASHTO - Who is responsible for obtaining all aggregate samples except verification samples?
Definition
The contractor.
Term
Where practicable, samples to be tested for quality shall be obtained from...
Definition
the finished product
Term
The material shall be inspected to determine discernible _______
Definition
variations
Term
When sampling from a flowing aggregate stream three things to remember are...
Definition
1-Obtain at least three approximately equal increments.
2-The total sample mass equals or exceeds the minimum recommended in table 5.4.2
3-Take each increments from the entire cross section of the material.
Term
What is the process of sampling from a conveyor belt?
Definition
1-Stop the conveyor belt.
2-Insert tow templates, with shape that conforms to the shape of the belt.
3-Carefully scoop all material between the templates.
4-Collect the fines on the belt with a brush and dust pan
Term
You should avoid sampling coarse aggregate or mixed coarse and fine aggregate from stockpiles, True or False?
Definition
True
Term
When sampling from stockpiles you should,
Definition
design a sampling plan for the specific case under consideration.
Term
What is the process for sampling from roadways
Definition
1-Obtain at least three approximately equal increments.
2-Combined mass shall equal or exceed the minimum recommended in 5.4.2
3-Take all increments from the roadway for the full depth of material.
4-Clearly make the specific areas from which each increment is to be removed, a metal template placed over the area is a definite aid in securing approximately equal increment weights.
Term
How many field samples should be taken?
Definition
The number required depends on the criticality or, and variation in, the properties to be measured, and should be sufficient to give the desired confidence in test results.
Term
Two common keys to obtaining samples, regardless of method are...
Definition
1-Obtain at least three approximately equal increments.
2-Combined sample mass equals or exceeds the minimum recommended in 5.4.2
Term
When shipping samples they should be in...
Definition
bags or containers so constructed as to preclude loss or contamination.
Term
Sample containers shall have...
Definition
Suitable individual identification attached and enclosed so that field reporting, laboratory logging, and test reporting may be facilitated.
Term
Sample mass for fine aggregate
Definition
10kg(25lbs)
Term
Suggested method for sampling from stockpile and power equipment is available...
Definition
develop a separate small sampling pile composed of materials drawn from various levels and locations in the main pile. Take several increments of the sampling pile to compose the field sample.
Term
Suggested method for sampling from stockpile and power equipment is NOT available...
Definition
Samples from stockpiles should be made up of a least three increments taken from the top third, mid-point and bottom third of the volume of the pile. A board shoved vertically into the pile just above the sampling point aids in preventing further segregation.
Term
Suggested method to sample from transportation units...
Definition
Excavate three or more trenches across the unit. The trench bottom should be approximately level at least 0.3m in width and in depth below the surface. A minimum of three increments from equally spaced points along each trench should be taken by pushing a shovel downward into the material.
Term
Method for sampling from quarries or ledges...
Definition
1-Inspect the quarry face for discernible variations or strata.
2-Gather 25kg form each stratum.
3-One or more pieces in each sample should be at least 150 by 150 by 100mm in size with the bedding plane plainly marked.
4-Record approximate quantity available; quantity and character of overburden; boundaries and location of material represented by each sample.
Term
What is the size of sample tubes for fine aggregates?
Definition
30mm(1-1/4") diameter by 2m(6ft) long.
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