Figure 15-18.-Cylinder in position before cutting a sample.Figure 15-19.-Cutting off a cylindrical sample.Figure 15-20.-Sealing a sample in a CBR mold.sample. You actually do the cutting to sizewith the sampling collar. You can forcethe sampler down with the field CBR jack;however,since this jack has only about2 in. of travel, you would do better to usea truck jack, if available. In either case,you should not force the sampler down aheadof the trimming on the outside of the cylin-der. Then excavate the trench deeper andrepeat the process until the soil penetrateswell into the extension collar. Finally, asshown in figure 15-19, cut off the sample atthe bottom of the mold with a shovel, knife, orwire, and remove the mold and sample from thehole.After removing the mold and sample fromthe hole, remove the upper collar of the mold,and trim the top surface of the sample downto approximately 1/2 in. from the top of themold. Then fill this recess with paraffin, asshown in figure 15-20, to seal the end of thesample. Then, after you turn the mold overand remove the cutting edge, a similar recessis formed in the bottom of the sample. Fillthis recess with paraffin also. If the sampleis to be handled a great deal, you shouldoverfill the ends with paraffin and thentrimedge.themthem exactly flush, using a straight-Place boards over both ends and clampin place, using bolts, string, or wire, as15-15
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