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After removing the mold and sample from the
hole, remove the upper collar of the mold, and
trim the top surface of the sample down to
approximately 1/2 in. from the top of the mold.
Then fill this recess with paraffin, as shown
in figure 15-20, to seal the end of the sample.
Then, after you turn the mold over and
remove the cutting edge, a similar recess is
formed in the bottom of the sample. Fill this
recess with paraffin also. If the sample is
to be handled a great deal, you should overfill
the ends with paraffin and then trim them
exactly flush, using a straight edge. boards
over both ends and clamp them in
place, using bolts, string, or wire, as
Figure 15-21.-Potecting a sample in a CBR mold. shown in figure 15-21. If the samples are to be transported some distance or will be handled quite a bit before testing, you should wrap them in cloth and soak them in paraffin layers. |
 
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