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Preparation of Test Samples - 14070_278
Figure  13-11B.Stress-penetration  curves  (reverse  of  CBR  test  data  sheet  DD  Form  1212). - 14070_280

Engineering Aid 1 - Advanced Structural engineering guide book
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Figure 13-11A.—Front of data sheet (DD Form 1212) for California bearing ratio test. the  piston.  The  penetration  dial  (fig.  13-9)  measures  the 10-pound  tamper,  55  blows  per  layer.  A  surcharge extent to which the piston penetrates the material in the weight  of  25  pounds  is  listed.  That  means  that  a CBR mold. 6-inch-diameter circular section of, in this case, the To better understand the test procedure, let’s study surface and base course of the airfield pavement is figure 13-11A. This figure shows an example of the data expected  to  weigh  25  pounds.  As  previously  described, for a CBR test. In this example, figure 13-11A indicates this weight was simulated using surcharge weights that the sample was compacted in five layers with the totaling  25  pounds. 13-13







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