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NDT Technology for Quality Assurance of HMA Pavement Construction (2009) / Chapter Skim
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Pages 80-83

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From page 80...
... 3.2 Control Limits for Statistical Control Charts The upper and lower control or action limits are calculated from the NDT modulus tests in accordance with the following equations. Where: UCLX– = Upper control limit for the sample means.
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From page 81...
... . Establish the action, as well as warning limits for the statistical control charts; upper and lower control limits (see Section 3.2)
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From page 82...
... The upper and lower PWL values are then determined from the Q-tables provided in the AASHTO QC/QA Guide Specification. Action Warning Limits, ksi Project Identification Material Target Modulus, ksi Pooled Standard Deviation, ksi UCL LCL I-85, AL Low Plasticity Clay 4.0 0.8 5.6 2.4 NCAT, OK High Plasticity Clay 6.9 2.0 10.8 3.00 SH-21, TX High Plasticity Clay 26.8 2.5 30.4 23.2 TH-23, MN Soil-AggregateEmbankment 16.4 1.0 17.8 15.0 US-2, ND Soil-AggregateEmbankment 19.0 2.6 22.7 15.3 SH-130, TX Improved Soil Embankment 35.3 2.8 39.3 31.3 NCAT, SC Crushed Granite Base 36.1 2.7 41.4 30.8 NCAT, MO Crushed Limestone Base 19.2 2.7 24.5 13.9 TH-23, MN Crushed Stone Base 24.0 2.6 27.7 20.3 US-53, OH Crushed Stone Base 27.5 1.6 30.6 24.4 NCAT, FL Limerock Base 28.6 3.5 35.4 25.5 US-2, ND Crushed Aggregate Base 32.4 4.5 38.8 26.0 US-280, AL Crushed Limestone Base 48.4 10.0 62.7 33.7 NOTE: The target modulus for the South Carolina crushed granite base was determined using the FHWA-LTPP regression equation, because the densities were significantly below the maximum dry unit weight of the material during NDT testing.
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From page 83...
... ksi I-85, AL Low Plasticity Clay NCAT, OK High Plasticity Clay SH-21, TX High Plasticity Clay 2.0 3.3 TH-23, MN Soil-AggregateEmbankment US-2, ND Soil-AggregateEmbankment SH-130, TX Improved Soil Embankment 2.1 3.5 NCAT, SC Crushed Granite Base NCAT, MO Crushed Limestone Base TH-23, MN Crushed Stone Base US-53, OH Crushed Stone Base NCAT, FL Limerock Base US-2, ND Crushed Aggregate Base US-280, AL Crushed Limestone Base 3.0 5.0 Table 37. Upper and lower specification limits for the unbound layers and materials included in the field evaluation projects.
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Key Terms

  • acceptance testing
  • hma base
  • process control
  • specification limits
  • plant produced

  • using equation
  • resilient modulus
  • target density
  • dynamic modulus
  • control limits

  • dry density
  • ndt devices
  • quality indices
  • crushed stone
  • seismic modulus

  • test specimens
  • base mix
  • total pwl
  • hma mixture
  • statistical control

  • ndt modulus
  • regression equations
  • structural design
  • modulus measured
  • control charts

  • plasticity clay
  • warning limits
  • lower quality
  • material using
  • control chart


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