CT 231- Nuke Gage

Question 1

Plate must be flat to a tolerance of how far in any plane?

Answer 1

1/16”

Question 2

Standard block should be a minimum of how far from any object?

Answer 2

5’

Question 3

Standard block should be a minimum of how far from other nuclear gage?

Answer 3

25’

Question 4

How long is the standard?

Answer 4

4 minutes

Question 5

Standard count should be within what?

Answer 5

Acceptable deviation limits or calibration

Question 6

What should be done to areas that have been worked by sheeps-foot rollers?

Answer 6

Remove loose surface material to a depth below the deepest penetration.

Question 7

Test surface should have a flatness of how much in any plane?

Answer 7

1/8”

Question 8

What number sieve should be used for filling minor depressions?

Answer 8

No. 4

Question 9

Depth of hole made should be how deep?

Answer 9

2” deeper than transmission depth

Question 10

If plate is rotated slightly around the pin and the plate does not make contact with the ground or if the hole appears to not be straight, what is done?

Answer 10

Make a new hole at the immediate adjacent area provided that the previous hole is not within the footprint of the gage.

Question 11

What should be done once the source rod is inserted in the hole?

Answer 11

Adjust the gage so the source rod is firmly against the side of the hole nearest the gage.

Question 12

How long is the density count?

Answer 12

1 minute

Question 13

No obstruction or foreign element should be within a distance of what from the sides of the source-detector axis? For wet density.

Answer 13

8”

Question 14

Should your transmission depth be equal, deeper, or less than the thickness of material being tested?

Answer 14

Less. 5” test for 6” deep material.

Question 15

No obstruction or foreign element should be within a distance of how many inches from the sides of the gauge? Moisture content.

Answer 15

10”

Question 16

Wet density and moisture content are in what units?

Answer 16

g/cc

Question 17

How many sq. yards will dictate 5 test sites?

Answer 17

Over 1,000 yards^2 but under 2,000 yards^2

Question 18

How many sq. yards will dictate 3 test sites?

Answer 18

Under 1,000 yards^2

Question 19

No test should be conducted on an area where what is present?

Answer 19

Debris, standing water, loose materials, or pumping conditions.

Question 20

What proportions of soil should be collected from each test site?

Answer 20

Equal proportions

Question 21

Moisture content of the composite sample must be what for testing?

Answer 21

Moisture must be maintained.

Question 22

What sieve size is used for a rock correction?

Answer 22

3/4”

Question 23

What % of rock captured on the sieve will dictate a rock correction?

Answer 23

10%

Question 24

Calc the relative compaction value to the nearest what first? And then to what after?

Answer 24

0.1% and then whole number %

Question 25

What rounding method is used once the relative compaction value at 0.1 level is found?

Answer 25

Normal rounding, 0.5< or equal round up, 0.5> round down

Question 26

Two densities must be within how much for a common to be made? For both wet density and moisture content.

Answer 26

0.05 g/cc

Question 27

How often must a “check” be done of the common?

Answer 27

On the 7th calendar day or after 14 tests, which ever comes first

Question 28

Can a common be made with the “check”? What dictates if it can or can’t?

Answer 28

Yes, must be within 0.05g/cc on both wet density and moisture content.

Question 29

You have a common setup of 2.05/0.14, your new test has a moisture of 0.19. How do you calc a moisture correction? And what is the moisture correction applied to?

Answer 29

0.14-0.19 = -0.05, applied to new wet density to find adjusted density.