Soil compaction test by core cutter method

Soil compaction test by core cutter method

        The most common Laboratory test is soil compaction test , as per CPWD specification soil compaction every 25cm per layer .For building compaction required above 95% and road 98%





  • Procedure of compaction   
  1.  Weight of core-cutter+ wet soil (Ws) in g
  2. Weight of core-cutter (wc) in g
  3. Weight of wet soil (Ws-Wc)
  4. Volume of core-cutter (Vc) in cm3
  5. bulk density Ɣb=Ws-Wc/Vc
  6. Water content container no
  7. Weight of container with lid(W1) in g
  8. Weight of container with lid and wet soil (w2) in g
  9. Weight of container with lid and dry soil(W3) in g
  10. Water content (w) in percent w=(W2-W3)/(W3-W1)
  11. Dry density Ɣd=(100*Ɣb)/(100+w)
  12. Percentage of compaction Cp=Dry density(Ɣd)/Max Dry density(MDD)


Example:

  1.  Weight of core-cutter+ wet soil (Ws) in g                                                             = 3000
  2. Weight of core-cutter (wc) in g                                                                              = 983              
  3. Weight of wet soil (Ws-Wc)                                                                                  = 2017
  4. Volume of core-cutter (Vc) in cm3                                                                        = 1020
  5. bulk density Ɣb=Ws-Wc/Vc                                                                                 = 1.97
  6. Water content container no                                                                                    = 3
  7. Weight of container with lid(W1) in g                                                                   = 34
  8. Weight of container with lid and wet soil (w2) in g                                              =220
  9. Weight of container with lid and dry soil(W3) in g                                               =210
  10. Water content (w) in percent w=(W2-W3)/(W3-W1)                                           = 5.68
  11. Dry density Ɣd=(100*Ɣb)/(100+w)                                                                      =1.86
  12. Percentage of compaction Cp=Dry density(Ɣd)/Max Dry density(MDD)           =96.37
Note: MDD value take after soil testing NIT or University

   


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