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Advanced Construction Equipments :Methods of field compaction

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Advanced Construction Equipments :Methods of field compaction

  1. 1.  The various method of field compaction 1. Rolling 2. Ramming 3. Vibrations
  2. 2.  Different types of rollers are used for compaction of soils.  The compaction depends upon the following factors.  Contact pressure  Number of passes (normally 5 to 15)  Layer of thickness (less than 15cm)  Speed of roller  Different types of rollers used are i. Smooth wheel rollers ii. Pneumatic tyred rollers iii. sheep foot rollers iv. Track laying vehicles
  3. 3. Smooth wheel rollers  Types of smooth wheel rollers 1. Conventional three wheel type having weight 2 to 15 ton. 2. Tendem rollers weight having 1 to 14 ton. 3. Three axle tendem roller having 12 to 18 ton.  These rollers are useful for compacting granular base courses of highway and runways.  These are not effective for compaction of deep layers of soils.
  4. 4. Sheep foot Roller  The sheep foot roller consists of a hollow drum with a large number of small projection on its surface.  These projections penetrate the soil layers during the rolling operations and cause compaction.  The drum can be filled with water to increase the mass.  The sheep-foot rollers are ideally suited for compaction of cohesive soils.
  5. 5. Pneumatic tyred Rollers  Pneumatic tyred Rollers use compressed air to develop the required inflation pressure.  The roller generally consists of 9 to 11 wheels fixed on two axles, with the pneumatic tyres so spaced that a complete coverage is obtained with each pass of the roller.  These rollers are effective for compacting cohesive as well as cohensionless soil.
  6. 6.  A hand operated rammer consists of a block of iron, about 3 to 5 kg in mass attached to a wooden rod.  The rammer is lifted for about 0.30m and dropped on the soil to be compacted.  Tampers are used to compact soils adjacent to existing structures such as trenches, within plinth of building etc.
  7. 7.  In vibratory compactors, vibrations are induced in the soil during compaction. The compactors are available in a variety of forms.  When the vibrator is mounted on a drum, it is called a vibratory roller.  These rollers are available both as pneumatic type and the smooth wheel type.  Another form of vibratory compactor is a vibrating plate compactor.  Hand operated vibrating plates are also available.  The effect of the vibrating plates is limited to small depths

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