CT 125 Agg - Sampling

Question 1

When sampling individual aggregate hot bins, what type of device is used?

Answer 1

Pan of sufficient size to intercept the entire cross section of the discharge stream and hold the required quantity of material without overflow.

Question 2

Where is one location that baghouse dust can be sampled?

Answer 2

From the bottom of the baghouse, from the feed line, or from the surge tank preceding the proportioning device.

Question 3

Where is the aggregate normally sampled at an HMA continuous mixing plant?

Answer 3

From a sampling device located in advance of the point where the aggregate enters the drier-drum mixer.

Question 4

What are the functional requirements of the sampling device?

Answer 4

The sampling device must intercept the entire cross-section of the discharge stream and hold the required quantity of material without overflowing.

Question 5

Where should aggregates be sampled at a concrete batch plant?

Answer 5

From the belt feeding the batch plant bins immediately preceding the weigh hopper.

Question 6

When taking a belt cut from a feed belt, how many templates should be used?

Answer 6

Two

Question 7

What shape should the templates be?

Answer 7

The templates should conform to the shape of the belt.

Question 8

Once the belt is stopped and the templates are in place, how should the sample be taken?

Answer 8

Completely remove the material between the templates, including all fines.

Question 9

Where in a windrow should samples be taken?

Answer 9

From the middle half

Question 10

How should windrow samples be taken?

Answer 10

Isolate the sample area using steel or plywood templates and remove the entire cross section of the windrow before water is added.

Question 11

When aggregate has been spread but not yet compacted, how many locations transversely across the roadway section should be sampled?

Answer 11

3 minimum

Question 12

How deep into the roadway should aggregate be taken?

Answer 12

Full depth, being careful to exclude underlying material.

Question 13

For any given aggr. type, what amount of material should be sampled?

Answer 13

An amount that meets or exceeds the quantity needed for subsequent testing

Question 14

When sampling agg. from HMA batch plants, who is responsible for providing the sampling device?

Answer 14

Contractor

Question 15

Where can supplemental fine aggregate be sampled from at an HMA batch plant?

Answer 15

Feed line and Surge tank

Question 16

When sampling agg. from HMA continuous plants, where must the sampling device be located?

Answer 16

Before the dryer-drum mixer

Question 17

When sampling agg, intercept the entire cross section of the discharge stream.

Answer 17

True

Question 18

When diverting the whole stream of aggregate for sampling, the first _____and last ______ should be wasted.

Answer 18

1/4, 1/4

Question 19

When using the sampler at the bottom of the baghouse, it is not necessary to clean the pipe prior to sampling the baghouse dust.

Answer 19

False

Question 20

When sampling agg. from Portland cement concrete batch plants, templates are not required to obtain belt cut.

Answer 20

False

Question 21

The following statements apply when sampling agg from windrows.

Answer 21

Use steel plates to isolate a sample in the middle half of the windrow. Remove a cross section equal to the width of a shovel or wider and obtain a sample from a vertical cut on either of the exposed faces.

Question 22

When sampling aggregate from roadways, wait until the material has been compacted to model actual conditions.

Answer 22

False

Question 23

When sampling agg. from transporation units, the sample should be obtained a distance from the edge that is about one -quarter of the bed width.

Answer 23

False. 1/3

Question 24

Which statement apply when sampling agg from a stockpile and power equip is not available?

Answer 24

The sample should consist of at least three portions, material should be obtained from the top third, and bottom third. A board placed in the stockpile just above the sampling location can reduce segregation.

Question 25

When sampling soil from the source, it is permissible to create a composite sample of different material types.

Answer 25

False

Question 26

When sampling lime slurry, obtain at least _______ of material.

Answer 26

Two 1 quart cans.