Figure 13-11B.—Stress-penetration curves (reverse of CBR test data sheet DD Form 1212).The 5,000-pound proving ring was used for whichstarting at 0.025 inch and increasing to 0.500 inch. Thethe proving-ring constant was 12 pounds for everysecond column lists standard unit loads. The test was0.0001 read on the proving-ring dial; for example,whencarried out by cranking the jack until the penetration dialthe proving-ring dial reads 0.0111, the force beingreaches the standard penetration, then reading the loadexerted by the piston is 12 x 111, or 1,332 pounds.for that penetration on the proving-ring dial. Notice thatseeIn the penetration data portion of the data sheet, youfor each dial reading there is a corrected dial reading thatthat the first column lists standard penetrationsis 0.003 inch less that the uncorrected reading. This13-14
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