The Role of Suction in the Performance of Clay Fill Reed Engineering Group Ronald F. Reed, P.E. Kundan K. Pandey, P.E.
Introduction • Brief History (Studies by Proctor) • What we will look at: – Moisture ~ Density – Moisture ~ Suction – Moisture ~ Stiffness • Case History
Proctor studied moisture-density and moisture-penetrometer relationships in the 1930s.
Penetrometer on Steroids
Moisture Density/Volume of Voids (Proctor.)
Similar Results for dry.
95%
Application
Moisture Variation Moisture Content 11 13 15 17 19 21 23 25 27 0 Borings in areas not collapsed 2 4 6 Boring in area of collapse 8 Depth 10 12 14 Field Density Tests 16 18 20
Conclusions • Materials compacted to equal % density, dry or wet of optimum have equal ratios. • A pocket penetrometer used in conjunction with density tests can be used to confirm results.
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