CT 125 HMA

Question 1

Using an automatic sampling device, how many pulls (individual samples) should be taken?

Answer 1

4 pulls

Question 2

How much time should elapse between each pull?

Answer 2

1 to 4 minutes

Question 3

When sampling from transportation unit, what type of device must be used to obtain material?

Answer 3

An automatic sampling device only.

Question 4

For a truck with a single bed configuration, how should the sample area be divided?

Answer 4

4 sections of equal length

Question 5

How far from the edge from the edge of the bed or from the sample borderlines should samples be taken?

Answer 5

At least 1 foot

Question 6

After the pile has been placed, what final step should the loader operator do before sampling can start?

Answer 6

Backdrag the pile to a height of about 16 inches.

Question 7

What is the minimum distance from the edge of the pile that samples may be taken?

Answer 7

1 foot

Question 8

What is the minimum distance from the base material that samples can be taken?

Answer 8

1 inch

Question 9

What is the minimum length of the sample area?

Answer 9

8 feet

Question 10

The edge of the sample area should be what minimum distance from either end of the windrow?

Answer 10

3 feet

Question 11

How much material is removed from the top of the windrow at each sample location?

Answer 11

Approx. 0.5 ft.

Question 12

How many close to the edge of the mat may HMA samples be taken?

Answer 12

1 foot

Question 13

How deep into the mat should HMA samples be taken?

Answer 13

Full depth, taking care to exclude the underlying material

Question 14

What is the procedure from combining collection containers that are half full of HMA?

Answer 14

Blend the material in all four containers together by mixing through a mechanical quatering device two times

Question 15

How are HMA sample containers filled?

Answer 15

After blending the material, place receptacles from opposite corners into the quartering device, then place 4 sample boxes under the device and split material directly into boxes.

Question 16

What are acceptable sample containers for HMA?

Answer 16

8x8x4 or 8.5 x 8.5 x 4.5

Question 17

When sampling rubber, bwc, or OGFC, sample containers should be lined with

Answer 17

Parchment paper or other release liner

Question 18

When sampling HMA from a plant conveyor system, how much time should elapse between individual pulls?

Answer 18

1 to 4 minutes

Question 19

When sampling asphalt mixtures from a deposited pile, windrow, or mat behind a paver, material should be shoveled from each quadrant or section directly into its corresponding collection container.

Answer 19

True

Question 20

When sampling a pile deposited at the plant, do not take material within:

Answer 20

1 ft. of the pile edge or within 1 in. of the base material.

Question 21

What is the required size of a windrow when sampling from a windrow laid down at the plant?

Answer 21

1 to 2 ft. high, 2 to 5 ft. wide and minimum 14 ft. longl

Question 22

After marking out the sample area, how much of the top of the HMA windrow should be discarded?

Answer 22

0.5 ft.

Question 23

When sampling from an HMA silo or batch plant discharge, the bulk sampler system material hopper must be capable of holding the entire drop.

Answer 23

True

Question 24

At what minimum depth below the material surface should a sample be obtained when sampling HMA from transportation units?

Answer 24

None of the Above

Question 25

When sampling a tandem bed transportation unit, split each bed into:

Answer 25

2 approx. equal sections to create 4 sections of equal length.

Question 26

When sampling from the mat behind the paver, it is not necessary to obtain the full depth of HMA since the paver creates a representative distribution of material.

Answer 26

False

Question 27

When sampling from HMA windrows, the front slope of the sample area should be trimmed and discarded to create a:

Answer 27

60 to 90 degree vertical face

Question 28

Which of the following applies when creating one sample set (consisting of 4 sample containers ) of asphalt mixtures?

Answer 28

Split the composite sample in a mechanical quartering device to yield enough material to fill 4 sample containers. Place 4 sample containers under the mechanical quartering device so that material will fill each container without overflow.