Figure 15-14.-Packing a chunk sample for transportation or
shipment to laboratory.
box and packing it, as shown in figure
Cylinder Samples by CBR Mold
Figures 15-15 through 15-19 show a CBR
fitted with a sampling
collar (or cutter), and how to obtain a cylinder
sample by using the CBR mold. This method may
be used in taking an undisturbed sample from
soft, fine-grained soils for undisturbed CBR or
When using this method, first smooth the
ground surface and then press the sampling
collar and mold into the soil with moderate
Figure 15-15.-Section through a CBR mold.
Figure 15-16.-Trench cut around a cylinder.
pressure. Then excavate a trench around the
cylinder and again press the mold down over
the soil, using the hand driver or loading
bar if necessary. You can improvise a loading
bar from any suitably sized piece of tim-
ber. Trim the soil away from the sampling
collar carefully with a knife, cutting down-
ward and outward to avoid cutting into the
Figure 15-17.-Using a loading bar to drive a cylinder.