Performance Specifications for Asphalt Mixtures (2016) / Chapter Skim
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11 chapter two Literature review on Performance SPecificationS for aSPhaLt mixtureS introduction This chapter provides an overview of the specific types of testing used to predict the asphalt mixture performance and on the types of performance specifications used both nationally and internationally for plant-produced asphalt mixtures. The information reported will assist in defining the amount to which performance specifications for asphalt have been developed and implemented.
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12 TAblE 1 SuMMARy oF KEy FEATuRES oF PERFoRMAncE TESTS FoR ASPhAlT MIxTuRES PERFORMANCE TESTS FOR ASPHALT MIXTURES Asphalt Pavement Analyzer Test Method: AASHTO TP 63: Determining Rutting Susceptibility of Asphalt Paving Mixtures Using the Asphalt Pavement Analyzer (APA) Applicability: The Asphalt Pavement Analyzer (APA)
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13 Disc-shaped Compact Tension (DSC) Fracture Energy Test Test Method: ASTM D7313-13.
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AMPT Flow Number Testing Test Method: AASHTO TP 79-10, Standard Method of Test for Determining the Dynamic Modulus and Flow Number for Hot Mix Asphalt (HMA) Using the Asphalt Mixture Performance Tester (AMPT)
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15 Applicability: The flexural fatigue test is used to characterize the fatigue life of HMA at intermediate pavement operating temperatures. The laboratory fatigue life determined by this standard has been used to estimate the fatigue life of asphalt concrete pavement layers under repeated traffic loading.
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16 Implementation: Presence of detailed equipment requirements may limit the use of Hamburg test equipment manufactured by other companies. T 324 details specific equipment requirements that appear to be written around the original Hamburg wheel-track equipment available in the United States from Precision Machine & Welding (PMW)
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17 Semicircular Bending Test Test Method: Proposed AASHTO Test Method for Determining the Fracture Energy of Asphalt Mixtures Using the Semi Circular Bend Geometry Applicability: SCB test is used to obtain the fracture energy of asphalt mixture lab or field specimens, which can be used in performance-type specifications to control various forms of cracking such as thermal, reflective, and block cracking of pavements surfaced with asphalt concrete. Implementation: Similar time and cost to perform other mixture and binder performance tests Good comparisons with more well-known Indirect Tensile Strength (ITS)
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18 pavement; therefore, a methodology of stochastically evaluating the in-place dynamic modulus of the as-built asphalt pavement using a relationship of in-place air voids and a set of single dynamic modulus values measured in the laboratory was presented. The methodology was validated with asphalt mix collected from a construction site and produced a plot to be used for comparing the estimated in-place dynamic modulus and the as-designed asphalt mix as a simple approach to evaluating as-built mix quality.
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19 upcoming construction seasons that MnDoT plans to finalize implementation of the DcT test. At present, the MnDoT is in the process of implementing a low-temperature cracking performance specification for asphalt mixtures.
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20 (3) adequate lift thickness.
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21 hMA: (1) the Texas overlay Tester was conducted to predict reflective cracking resistance, (2)
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22 how pay will be either increased or decreased for meeting, or failing to meet, established performance target values. The software allowed users to input asphalt mixture variables and predicted changes in performance based on adjustments to the inputs.
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23 ing. The report suggested that it is not necessary to require plant-compacted or field-compacted samples to get accurate pavement performance predictions and that the MEPDG software was a relatively appropriate tool for determining the life expectancy of a pavement.
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24 A study by Monismith et al.
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25 asphalt pavement analyzer (APA)
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26 international efforts: new Zealand A performance-based specification was implemented in 2000 in new Zealand for the design, maintenance, and performance requirements for flexible unbound pavement layers for the construction of new pavements and reconstruction of existing pavements (Transit new Zealand 2000)
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27 reSearch on the advancement of Performance SPecificationS for aSPhaLt mixtureS In this section, the past and current research related to the advancement of performance specifications for asphalt mixtures is summarized. regional research Much of the effort in the initial development of modern-day PRS for asphalt pavements originated with the WesTrack study.
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28 NCHRP Project Number NCHRP Project Title Brief Description of Project Scope 9-46 Improved Mix Design, Evaluation, and Materials Management Practices for Hot Mix Asphalt with High Reclaimed Asphalt Pavement Content Develop a mix design and analysis procedure for HMA containing high RAP contents that provide satisfactory long-term performance. Propose changes to existing specifications to account for HMA containing high RAP contents.
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