CTQP Earthwork Construction Inspection

Question 1

What does the term 'optimum moisture content' refer to in earthwork compaction?

Accepted Answer

The moisture level at which soil achieves maximum dry density

Answer

Optimum moisture content is the moisture level at which a given soil achieves its maximum dry density under a specified compaction effort.

Question 2

Which FDOT test method is used to determine the field density of compacted embankment material?

Accepted Answer

ASTM D 1556 or nuclear gauge method

Answer

FDOT uses the sand cone method (ASTM D 1556) or the nuclear density gauge to measure field compaction density of earthwork.

Question 3

What minimum percent compaction is typically required for embankment fill under Florida Department of Transportation specifications?

Accepted Answer

95%

Answer

FDOT specifications generally require embankment fill to be compacted to at least 95% of maximum dry density per AASHTO T 99 or T 180.

Question 4

What is a 'borrow pit' in the context of CTQP earthwork inspection?

Accepted Answer

An off-site area from which suitable fill material is obtained

Answer

A borrow pit is an off-site excavation from which suitable embankment or fill material is obtained when sufficient on-site material is unavailable.

Question 5

During earthwork inspection, what is the maximum lift thickness typically allowed for general embankment before compaction?

Accepted Answer

12 inches loose measure

Answer

FDOT specifications typically limit loose lift thickness to 12 inches for general embankment to ensure adequate compaction throughout the layer.

CTQP - Construction Training & Qualification Program Practice Test