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Ruggedness Testing of the Dynamic Modulus and Flow Number Tests with the Simple Performance Tester (2008) / Chapter Skim
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Pages 110-124

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From page 110...
... F1 A P P E N D I X F SPT Test Methods
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From page 111...
... 2. REFERENCED DOCUMENTS 2.1 AASHTO Standards • NCHRP 9-29 PP 01, Preparation of Cylindrical Performance Test Specimens Using the Superpave Gyratory Compactor • NCHRP 9-29 PP 02, Developing Dynamic Modulus Master Curves for Hot-Mix Asphalt Concrete Using the Simple Performance Test System 2.2 Other Publications • Equipment Specification for the Simple Performance Test System, Version 3.0, Prepared for National Cooperative Highway Research Program (NCHRP)
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From page 112...
... The applied stresses and resulting axial strains are measured as a function of time and used to calculate the dynamic modulus and phase angle. 4.3 In the flow number procedure an HMA specimen at a specific test temperature is subjected to a repeated haversine axial compressive load pulse of 0.1 sec every 1.0 sec.
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From page 113...
... 6.2 Dynamic Modulus Test System - A dynamic test system meeting the requirements of Equipment Specification for the Simple Performance Test System, Version 3.0. 6.3 Conditioning Chamber - An environmental chamber for conditioning the test specimens to the desired testing temperature.
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From page 114...
... 9.1.2 Prepare at least two test specimens to the target air void content and aging condition in accordance with NCHRP 9-29 PP 01, Preparation of Cylindrical Performance Test Specimens Using the Superpave Gyratory Compactor. Note 1 – A reasonable air void tolerance for test specimen fabrication is ± 0.5 %.
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From page 115...
... Turn on the Simple Performance Test System, set the temperature control to the desired testing temperature and allow the testing chamber to equilibrate at the testing temperature for at least one hour. 9.4.1.3 When the dummy specimen and the testing chamber reach the target temperature, open the testing chamber, remove a test specimen from the conditioning chamber, and quickly place it in the testing chamber.
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From page 116...
... Determining the Dynamic Modulus and Flow Number for Hot Mix Asphalt (HMA) Using the Simple Performance Test System 6 of 14
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From page 117...
... 9.4.2.13 Repeat steps 9.4.2.3 through 9.4.2.12 for the remaining test specimens. 9.5 Computations and Data Quality 9.5.1 The calculation of dynamic modulus, phase angle, and the data quality indicators is performed automatically by the Simple Performance Test System software.
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From page 118...
... Data Quality Statistic Limit Deformation Drift In direction of applied load Peak to Peak Strain 75 to 125 μstrain unconfined tests 85 to 115 μstrain confined tests Load standard error 10 % Deformation standard error 10 % Deformation uniformity 30 % Phase uniformity 3 degrees Note 3 – The data quality statistics in Table 2 are reported by the Simple Performance Test System software. If a dynamic modulus test system other than the Simple Performance Test System is used, refer to Equipment Specification for the Simple Performance Test System, Version 3.0 for algorithms for computation of dynamic modulus, phase angle, and data quality statistics.
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From page 119...
... 9.6.1.6 Data quality statistics. 9.6.2 Attach Simple Performance Test System dynamic modulus test summary report for each specimen tested.
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From page 120...
... Turn on the Simple Performance Test System, set the temperature control to the desired testing temperature and allow the testing chamber to equilibrate at the testing temperature for at least one hour. 10.3.3 When the dummy specimen and the testing chamber reach the target temperature, open the testing chamber, remove a test specimen from the conditioning chamber, and quickly place it in the testing chamber.
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From page 121...
... Determining the Dynamic Modulus and Flow Number for Hot Mix Asphalt (HMA) Using the Simple Performance Test System 11 of 14
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From page 122...
... 10.6.4 Attach Simple Performance Test System flow number test summary report for each specimen tested. 10.4.7 Steps 10.4.5 and 10.4.6 including return of the test chamber to the target temperature shall be completed in 5 minutes.
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From page 123...
... . Determining the Dynamic Modulus and Flow Number for Hot Mix Asphalt (HMA)
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From page 124...
... Using the Simple Performance Test System 14 of 14
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Key Terms

  • deviator stress
  • environmental chamber
  • deformation measuring
  • confining pressure
  • hot mix

  • mix asphalt
  • greased double
  • axial strain
  • testing chamber
  • simple performance

  • performance test
  • test specimens
  • minimum rate
  • permanent axial
  • dynamic modulus

  • temperature sensor
  • quality statistics
  • phase angle
  • standard error
  • friction reducers

  • top loading
  • loading platen
  • remaining test
  • bottom loading
  • superpave gyratory

  • gyratory compactor
  • target temperature
  • including return
  • data quality
  • loading platens


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