Figure 13-11A.—Front of data sheet (DD Form 1212) for California bearing ratio test.the piston. The penetration dial (fig. 13-9) measures the10-pound tamper, 55 blows per layer. A surchargeextent to which the piston penetrates the material in theweight of 25 pounds is listed. That means that aCBR mold.6-inch-diameter circular section of, in this case, theTo better understand the test procedure, let’s studysurface and base course of the airfield pavement isfigure 13-11A. This figure shows an example of the dataexpected to weigh 25 pounds. As previously described,for a CBR test. In this example, figure 13-11A indicatesthis weight was simulated using surcharge weightsthat the sample was compacted in five layers with thetotaling 25 pounds.13-13
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