3 – Soil Conditions & Subgrade Preparation

The first layer of soil is called

Increasing the soil’s load-bearing capacity is called

Water penetration is a consequence of building on soil that has not been properly compacted.

Unstable concrete forms is a consequence of building on soil that has not been properly compacted.

Structural failure is a consequence of building on soil that has not been properly compacted.

Standing water is a consequence of building on soil that has not been properly compacted.

Cracked pavement is a consequence of building on soil that has not been properly compacted.

To dispose of fill material is a primary goal of compacting.

To increase soil density is a primary goal of compacting.

To increase load-bearing capacity is a primary goal of compacting.

To decrease moisture in the soil is a primary goal of compacting.

To reduce air voids in the soil is a primary goal of compacting.

To decrease concrete needed for job is a primary goal of compacting.

The degree to which a soil can be compacted is affected by the amount of soil being compacted

The degree to which a soil can be compacted is affected by the amount of moisture in the soil

The degree to which a soil can be compacted is affected by the type of structure being erected

The degree to which a soil can be compacted is affected by the type of equipment being used

The degree to which a soil can be compacted is affected by the type of soil being compacted

Soils vary in their capacity to be

The first few inches of most soils contain

Soil that compacts well contains

Cohesive soils

Effects of moisture on soil compaction.

Water in the soil ______

If the soil is saturated with water

This method of soil compaction delivers a series of high-impact blows to the surface.

This method of soil compaction uses the weight of a heavy machine to press soil particles together.

This method of soil compaction delivers high-frequency vibration to the soil through a base plate or a roller drum.

Designed to compact granular soils in smaller areas

Combines vibration and a kneading action to compact large areas of cohesive or mixed soils

Consists of one roller that can operate with or without vibration, controlled by a walk-behind operator

Powered by gas, diesel, electricity, or air, comes with different shoe sizes, suitable for any compactible soil

Designed to compact large areas of granular soil

Results of the test are expressed as a percentage that may be more than 100 percent.

A testing device is placed over the hole and a source rod inserted.

This test measures soil moisture and soil density.

The sample is weighed and dried in an oven.

The test takes several hours to complete.

A microprocessor converts the data and displays it.