Question

explain one method of field compaction control

Answer 1

Compaction is the densification of soil materials by the use of mechanical energy. Soil is compacted by removing air and water from its pore space.

FIELD COMPACTION CONTROL The field compaction control consists of the determination of, 1) Dry density 2) Water content

Soil Compaction in the Field: 1- Rammers 2- Vibratory Plates 3- Smooth Rollers 4- Rubber-Tire 5- Sheep foot Roller 6- Dynamic Compaction

1) Dry density Measured 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,

Field Soil Compaction Because of the differences between lab and field compaction methods, the maximum dry density in the field may reach 90% to 95%. Dry Density max 95% gd max Moisture Content (OMC)

Relative compaction For cohesive soils, For cohesionless soils,

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

Proctor needle test

Disadvantages of proctor needle test It is not reliable for cohesion less soil not Give the execute result for cohesion less soil Advantages Method is fast Reliable for fine grained soil