Short-Term Laboratory Conditioning of Asphalt Mixtures (2015) / Chapter Skim
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F-1 Proposed AASHTO Recommended Practice for Conducting Plant Aging Studies A P P E N D I X F Standard Recommended Practice for Measuring the Effects of Asphalt Plant Mixing and Processing on Binder Absorption by Aggregate and Asphalt Mixture Characteristics AASHTO Designation: X xx-xx INTRODUCTION The effects of plant production on asphalt material properties have been researched for many years resulting in a number of changes in mixture design procedures to produce laboratory specimens with the same degree of aging as mixtures processed through a batch or drum mixing plant. The importance of being able to simulate plant aging in the laboratory is high for mixture volumetric considerations such as asphalt absorption, and it is absolutely essential for performance testing of mixtures for moisture, rutting, and fatigue susceptibility.
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F-2 Figure 1. Overall Flow Chart for Conducting Short-Term Aging Studies of Asphalt Mixtures 1.2.
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F-3 3.2. If a relatively few factors and levels of factors are included in the study, a full-factorial experiment will give the most definitive results.
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F-4 4.2. A checklist should be made to ensure that all the needed laboratory equipment and supplies are ready.
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F-5 5.2.2. Volumetric parameters that may be of interest to compare LMLC short-term aged with PMPC specimens include maximum specific gravity (Gmm)
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F-6 parameters with the LMLC volumetric measurements will verify that the plant-produced materials are sufficiently similar to those produced in mixture design so that the comparison performance testing results will not be affected by extraneous variables. Performance testing should include the same stiffness measurements, rutting tests, and cracking tests that were used in evaluating the LMLC material.
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F-7 7.3. Once the ANOVA has been completed, an additional step of ranking the data can be accomplished using Tukey's method, for instance.
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