KDOT Construction Materials Testing & Quality Control 2

Question 1

When performing a sand equivalent test on a fine aggregate sample, what does a higher sand equivalent value indicate?

Accepted Answer

Cleaner aggregate with less plastic fines

Answer

A higher sand equivalent value indicates the aggregate is cleaner and contains fewer detrimental plastic fines and clay material.

Question 2

According to KDOT specifications, what is the minimum number of random samples required per lot for hot mix asphalt acceptance testing?

Accepted Answer

3 samples

Answer

KDOT requires a minimum of 3 random samples per lot to establish statistical validity for HMA acceptance decisions.

Question 3

During concrete placement, a slump test result of 0 inches on a mix designed for 3-inch slump most likely indicates:

Accepted Answer

Mix is too dry or has lost workability

Answer

A slump of 0 inches on a mix designed for 3 inches typically indicates the concrete is too stiff, possibly due to insufficient water or loss of workability during transport.

Question 4

What laboratory method is used to determine the plastic limit of a soil?

Accepted Answer

Rolling soil into 1/8-inch diameter threads until they crumble

Answer

The plastic limit is determined by rolling soil into 1/8-inch (3.2 mm) diameter threads and noting the moisture content at which threads begin to crumble.

Question 5

A proctor compaction test yields a maximum dry density of 118 pcf. Field nuclear gauge readings show 115.8 pcf. What is the percent compaction?

Accepted Answer

98.1%

Answer

Percent compaction = (115.8 / 118) × 100 = 98.1%, which meets typical KDOT embankment requirements.

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

KDOT Construction Materials Testing & Quality Control 2