Development of a Flow Number Predictive Model.pdf

Development of a Flow Number Predictive Model Maria Carolina Rodezno, Kamil E. Kaloush, and Matthew R. Corrigan The NCHRP 9-19 panel recommended the repeated load permanent from the RLPD test. However, very limited efforts have been under- deformation test as a laboratory procedure that could be used to evaluate taken to predict the FN parameter itself (1, 5). This study recognized the resistance of a hot-mix asphalt (HMA) to tertiary flow. No standard the need of a model that is capable of predicting the FN parameter. test protocol addresses the required laboratory stress to be applied. Knowing potentially the FN of a HMA mixture would provide valu- The test can take several hours until tertiary flow is reached and in able information during laboratory testing for selecting appropriate many cases the sample may never fail. A model capable of predicting or stress and temperature conditions. Determining suitable deviator providing general guidance on the flow number characteristics of a mix stress at a particular testing temperature will allow failing the sample can be of great value. The model can be ideally used as a guideline to within a reasonable time. This will save resources in terms of testing determine the stress–temperature combination that will yield tertiary time and also will ensure a test that fully describes the three stages of flow within a reasonable testing time. In this study, an effort was under- the RLPD test (primary, secondary, and tertiary). The model can be taken to develop a flow number predictive model. The model uses HMA also used as a tool to rank mixes based on their FN potential knowing mixture volumetric properties and stress–temperature testing conditions only fundamental mix properties, such as binder and volumetric mix as predictor v