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Development of a New Revised Version of the Witczak E* Predictive Model for Hot Mix Asphalt Mixtures (With Discussion)
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2006
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Highway PavementPavement Design GuidePavement EngineeringEngineeringHma MixtureStructural PerformanceStructural EngineeringHma MixturesGeotechnical EngineeringHybrid MethodsTest MethodsModeling And SimulationTransportation EngineeringAsphaltPavement ManagementConstruction OperationsCivil Engineering MaterialsCivil EngineeringConstruction Engineering
The current Witczak E* Predictive Model is used in the National Cooperative Highway Research Program’s mechanistic‑empirical pavement design guide, highlighting the need for an improved model. The paper develops a revised Witczak E* Predictive Model to overcome limitations of existing models for predicting dynamic modulus of hot mix asphalt mixtures and to enable its incorporation into future revisions of the NCHRP pavement design guide. The model was developed using a large database of 7,400 E* measurements from 346 hot mix asphalt mixtures collected at Arizona State University. The revised model accurately predicts E* variations with mixture volumetrics, material properties, temperature, and loading frequency, and is found to be rational, unbiased, accurate, and statistically sound across the full database.
The main purpose of this paper is to present the development of a new revised version of the widely known Witczak E* Predictive Model. The model development was aimed at overcoming the limitations of current models available to the pavement community, which are used for predicting the dynamic modulus (E*) of hot mix asphalt mixtures (HMA). A comprehensive study was completed at Arizona State University to conduct numerous E* testing and finalize a huge E* database, containing 7400 data points from 346 HMA mixtures. This database was used to develop the new E* predictive model. The model is capable of accurately estimating changes in E* of HMA mixture as a function of changes in mixture volumetrics, material properties, temperature and loading frequency (or time) for the entire E* database used. The model has been found to be rational, unbiased, accurate, and statistically sound. The new mechanistic-empirical pavement design guide entitled “Guide for Mechanistic- Empirical Design of New and Rehabilitated Pavement Structures” developed under National Cooperative Highway Research Program (NCHRP) Project 1-37A uses the current version of Witczak E* Predictive Model in its input levels 2 and 3. It is hypothesized that due to its similar sigmoidal structure as used in the guide, the newly developed E* model can be easily incorporated in a future revision of this pavement design guide.