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Evaluation of Indirect Tensile Test (IDT) Procedures for Low-Temperature Performance of Hot Mix Asphalt (2004) / Chapter Skim
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Pages 25-28

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From page 25...
... In fact, the compliance values determined using the IDT appear to agree more closely with compliance values determined in uniaxial compression. Because of the extensive work done on the IDT test and analysis -- especially the calibration of the Superpave thermal cracking model to field studies -- it is recommended at this time that the IDT creep and strength test be retained as the primary method of evaluating the low-temperature properties of asphalt concrete mixtures.
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From page 26...
... Another important recommendation made in this study is that the temperatures used for low-temperature creep and strength tests should vary according to the stiffness of the mixture. For asphalt concrete mixtures made using PG XX-22 and PG XX-28 binders, the current test temperatures of −20, −10 and 0°C should be retained.
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From page 27...
... The third implementation item associated with AASHTO T322 is future research to better characterize the relationship between uncorrected IDT strength and corrected IDT strength as determined using the procedure given in AASHTO T322. This will provide an improved equation for estimating the corrected IDT strength from the uncorrected strength calculated using the maximum load.
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From page 28...
... Such approaches would be very useful for general mixture selection, mixture design guidance, quality control applications, and as possible replacements for the current Level 2 and 3 thermal cracking data input for the pavement design guide developed in NCHRP Project 1-37A. The major effort for estimating creep compliance is the development of methods to predict the binder master curve from limited AASHTO M320 test data.
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Key Terms

  • uniaxial tension
  • idt strength
  • uniaxial compression
  • dynamic modulus
  • master curve

  • curve test
  • idt creep
  • idt test
  • asphalt concrete
  • modulus test

  • creep compliance
  • prony series
  • modulus master
  • strength test
  • tensile strength

  • values determined
  • determined using
  • strength tests
  • test geometry
  • relaxation modulus

  • thermal cracking
  • idt compliance
  • thermal contraction
  • compliance values
  • test equipment

  • cracking model
  • superpave centers
  • superpave thermal
  • test temperatures
  • creep test


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