TABLE 4 - Based on the material passing the 3 in (75-mm) sieve.
PLASTICITY CHART
Table 4 Detail For classification of fine-grained soils and fine fraction of course-grained soils. Atterberg limits plotting in hatched area are borderline classifications requiring use of dual symbols. Equation of A-line:
PI = 0.73 (LL-20)
Notes: The above charts reprinted with permission from the Annual Book of ASTM Standards, copyright the American Society for testing and Materials, Philadelphia, Pennsylvania.
