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Laboratory Test Sheet
Unconfined compression test - BS 1377 : Part 7 : 1990
Unconfined compression test
Location Job ref.
Borehole/Pit no.
Soil description Sample No.
Depth excavated
Group/Type   Date Form
Test method                 BS1377: Part 7:  1990  7.2 
Type of specimen Undisturbed/compacted* Nominal diameter
Preparation procedure
Specimen details Initially   After test Sketch showing specimen
location in original sample
Diameter D mm Mass g
Area Ao mm2 Dry mass g
Length   Lo mm Moisture
Volume cm3 Content %
Mass g
Density Mg/m3
Compression test
Machine no. Rate of deformation mm/min
Force device no. Mean calibration N/division Stress factor kPa/division
Deformation Compression Strain Force gauge Axial force Corrected Axial stress
gauge of specimen e = DL reading p area      
reading DL Lo N A =   Ao s1 = 1000P  
mm     1-e   A  
  mm2 kPa
Maximum axial stress
Sketch of
failure conditions kPa
Axial strain at failure
inclination of %
shear surface Unconfined compressive strength qu
Operator Checked Approved
* Delete as appropriate
Form 7F