1. The following data represent a mechanical analysis of Pleistocene glacial outwash from Kansas:
| Size Grade(mm) |
Weight Retained(g) |
| 19 |
30 |
| 9.5 |
18 |
| 4 |
28 |
| 2 |
35 |
| 1 |
30 |
| 0.5 |
16 |
| 0.25 |
20 |
| 0.125 |
15 |
| 0.075 |
10 |
a. Plot the particle size distribution of this figure.
b. Calculate the Uniformity Coefficient
c. Using the Unified Soil Classification System of the U.S. Army Corps of Engineers, classify the soil. (The fines are easy to crumble when dry and has rapid reaction when shaken.)
2. Give three reasons why bentonite (Na+ montmorillite) used for drilling mud instead of kaolinite clay?