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NCHRP Web Doc 14 Laboratory Determination of Resilient Modulus for Flexible Pavement Design Final Report (1997) / Chapter Skim
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G: Specimen Preparation of Cohesive Soil
Pages 397-406

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From page 398...
... The spring loaded kneading compactor, which uses a pie shaped foot, was used to compact the silty sand and clayey sand soils into a 4.0 in. diameter mold.
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From page 399...
... Leave the base drainage valve open throughout the test. Soaking Cohesive Specimens Cohesive soil specimens were soaked by applying a back pressure of lLO psi to the specimen for about 15 days.
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From page 400...
... The increased weight of the soil sample equals the weight of water that flowed into the soil specimen. Calculate the degree of saturation of the soaked sample.
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From page 401...
... The vertical steel bar is supported by a steel base to give stability. The alignment support device maintains the four clamps on He middle of the sample at a fixed separation distance equal to half of the total specimen height.
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From page 402...
... 1 ' ~ 1' o - ~ ~ Ple glass Coil , ~ __ , ~ ~ ~ Plexiglas Split Sold Hem; ~9 `` ~ ~ C oh 4t ~ ~ _ o Collar Figure G- 1. Setup for preparing cohesionless soil specimen G-6 Vacuum Tribal Cell Base
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From page 403...
... ~ Figure G-2. Setup used to soak cohesive soil specimens G-7 Filter Paper PVC Mold Filter Paper
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From page 404...
... ~ Figure G-3. Clamps used in grouting the ends of the test specimen G-8
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From page 405...
... Ha mar.
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From page 406...
... Side view of alignment support device Figure G-5. Eternal L~VDT clamps and alignment support device C-10
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Key Terms

  • soil specimen
  • cohesive soil
  • soil sample
  • soil specimens
  • wet soil

  • alignment support
  • support device
  • filter paper
  • split mold
  • compacted specimen

  • evdt clamps
  • remaining portion
  • specimen base
  • pressure board
  • mold walls

  • air dried
  • layers using
  • dry density
  • tnaxial cell
  • alignment supports

  • subbase materials
  • inside evdt
  • content evaluated
  • ten layers
  • hydrostone paste

  • fixed separation
  • llo psi
  • shaped foot
  • distance equal
  • soaking cbr


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