KDOT Asphalt & Concrete Paving Inspection 2

Question 1

What is the minimum number of cores that KDOT typically requires for density verification on an asphalt lot?

Accepted Answer

3 cores per lot

Answer

KDOT specifications generally require a minimum of 3 cores per lot to statistically represent density across the paved area.

Question 2

During hot-mix asphalt (HMA) placement, the inspector notices the mix is arriving at the paver at 260°F. What action should be taken?

Accepted Answer

Reject the load; mix is overheated and may be burned

Answer

HMA delivered above the maximum mixing/lay-down temperature (typically around 325°F, but 260°F can be project-specific; if it exceeds the JMF maximum, the load is rejected) — inspectors must reject burned or overheated mix that fails temperature specs.

Question 3

Which concrete curing method is generally considered most effective for preventing plastic shrinkage cracking?

Accepted Answer

White-pigmented curing compound applied immediately after finishing

Answer

White-pigmented curing compound applied immediately after the bleed water sheen disappears reflects sunlight and seals moisture, minimizing plastic shrinkage cracking.

Question 4

An inspector measures the longitudinal joint offset between two adjacent asphalt layers and finds them aligned directly over each other. This is:

Accepted Answer

Non-compliant; joints should be offset by at least 6 inches between layers

Answer

KDOT requires longitudinal joints to be offset by at least 6 inches (150 mm) between successive lifts to prevent a continuous plane of weakness.

Question 5

What does the term 'mat temperature differential' refer to during asphalt paving inspections?

Accepted Answer

The temperature variation across the width of the paved mat behind the screed

Answer

Mat temperature differential is the variation in mix temperature measured laterally across the mat width, which can indicate segregation or screed heating problems.

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

(KDOT) Certified Kansas Department of Transportation Inspector Practice Test

KDOT Asphalt & Concrete Paving Inspection 2