Figure 15-21.-Potecting a sample in a CBR mold.Figure 15-22.-Halving the sample.shown in figure 15-21. If the samples are to betransported some distance or will be handled quitea bit before testing, you should wrap them in clothand soak them in paraffin layers.QUARTERING SAMPLESThe process of reducing a representative soilsample to a convenient size or of dividing a sam-ple into two or more smaller samples for testingis called QUARTERING. The procedures varysomewhat, depending upon the size of the sample.Samples Weighing Over 100 PoundsTo quarter a sample of this size, first mix andpile the sample on a canvas, using a shovel. Placeeach new shovelful on the top-center of thepreceding one so that the soil will be distributedevenly in all directions. Then flatten the sampleto a circular layer of approximately uniformthickness. Next, insert a stick or length of pipeunder the canvas and then lift it at both ends todivide the sample into two equal parts, as shownin figure 15-22. Remove the stick, leaving a foldin the canvas, and then reinsert it under the sam-ple, but this time, at right angles to the first divi-sion. Again, lift the stick. This divides thesample into four parts, as shown in figure 15-23.Discard two diagonally opposite quarters, takingcare to clean the fines from the canvas. Thenremix the remaining material, taking alternateshovelful from each quarter. Repeat the quarter-ing process as necessary to reduce the sample tothe desired size.Samples Weighing Between25 and 100 PoundsIn quartering a sample of this size, pile the soilon the canvas and mix it by alternately lifting theFigure 15-23.-Quartering the sample.15-16
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