presented bydasthagiri

Soil compaction

Table of contents1.compaction concept2.factors affecting compaction3.types of compaction4.laboratory compaction tests5.field compaction control6.conclusion

Compaction concept

Increasing unit weight of soil by reducing air voids in order to make use of ground surface for development,i.e.buildings,roads etc. by applying a load over a small area air gets out from unsaturated soil

Factors affecting compaction

Types of compaction Rolling or kneading-most effective for clayey soil Vibrating –most effective for nonclayey soil Dropping a heavy weight-suitable for both type of soils

Moisture content

Soil type

Compactive effortMore enery-greater compaction

Method of compaction

Soil Compaction in the Field:

1- Rammers

2- Vibratory Plates 

3- Smooth Rollers

4- Rubber-Tire

5- Sheep foot Roller

6- Dynamic Compaction

Laboratory compaction of soil

Standard proctor test(light compaction test)

Modified proctor test(heavy compaction test)

Comparision curve

FIELD COMPACTION CONTROLThe field compaction control consists of the

determination of,1) Dry density2) Water content

1) DRY DENSITYMeasured using core cutter and sand replacement method.The degree of compaction achieved in the measured by the

relative compaction, which defined as the ratio, expressed as a percentage.

Relative compaction,

2) WATER CONTENT Measured using oven drying method. In the field water content determined using,

Sand bath method Alcohol method(the calcium carbide method) The nuclear method Proctor needle method

conclusion Ultimately compaction is depending on the void ratio of soil Compaction is a factor of practical importance is the

increase of soil strength and stability. Now a day in urban area land is one of the most common

problems In such case if soil’s engineering property is not up to the

requirement then there is no way without abandon that project

So in that case soil compaction can be applied as a one of the most economic ground improvement technique.

Any queries?