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
