ETCM 4330-Spring 2024-Quiz 3

A soil sample has a volume of 1 inch³. Its in-situ weight is 1.2 lbs., and its oven-dry weight is 1 lb. Then, the dry density of this soil sample is ---------

• 1.2 lb/in³

• 1.0 lb/ft³

• 1.0 lb/in³

• 0.8333 lb/in³

More compaction effort means---------

• Increasing the air voids in the soil

• Achieving lower dry density in the field

• Increasing the total volume of the soil in the field

• Achieving higher dry density in the field

In the field, in order to achieve the maximum dry density of the soil, you need to------- the soil water content

• Optimize

• Maximize

• Minimize

• It depends on the soil properties

The standard proctor test is typically used to determine the maximum dry density of the soil in the-----

• Field

• Lab

The nuclear gauge is typically used to determine the dry density of the soil in the-----

• Field

• Lab

Comparing the dry densities achieved in the lab and in the field, which value is higher?

• Field

• Lab

The last thing you do before pouring concrete is to-------

• check the soil moisture content

• check that the soil dry density is within the limits of the blueprints

• take a soil sample to the lab and conduct the proctor test

• use a soil probe to measure the soil's bearing capacity

Comparing the dry densities achieved in the lab and in the field, the field dry density should be at least------ of the lab dry density.

• 50%

• 60%

• 95%

• 195%

If you are the field engineer and you are given this compaction curve, what is the expected dry density if the soil moisture content in the field is about 5%?

• 117.6

• 120

• 118.5

• 115

As shown in this picture, the probe penetrates about 8 inches into the soil. As a field engineer, what will you do?

• recompact the soil

• pour the concrete

• dry the soil

• take-out the top soil and replace it with stone