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144 Preface This NCHRP study was an LTPP Data Analysis Study to examine the significance of as- constructed asphalt pavement air voids on the performance of asphalt pavements. This study examined new asphalt pavements and rehabilitated asphalt pavements but did not include composite pavements. The research team employed three analysis methods to examine a dataset extracted from the LTPP database and generated subgroup scatter plots, regression models, and artificial neural network (ANN) models. The primary sources of data for the study were 426 LTPP sections for the analysis and MnROAD and NCAT research sections for the validation. This is one of many studies using the LTPP database to better understand pavement performance. This study was previously attempted in 2001 and was terminated due to insufficient LTPP performance data at that time.
