Development and Use of the LTPP Analysis-Ready Materials Dataset
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2023-12-01
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Edition:Final Report
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Abstract:The objective of the Federal Highway Administration Long-Term Pavement Performance (LTPP) program is to increase pavement life by the investigation of the long-term performance of various designs of pavement structures and rehabilitated pavement structures, using different materials and under different loads, environments, subgrade soil, and maintenance practices. Information about pavement material properties is a key component of pavement performance and is of great interest to researchers. This report provides documentation regarding the objectives, scope, and approach of a study to develop an Analysis-Ready Materials Dataset (ARMAD), which integrates the material properties of several categories of pavement layers—asphalt concrete materials, portland cement concrete materials, unbound granular base/subbase, stabilized base/subbase, subgrade, and other layers such as surface treatments and engineering fabrics. The scope of this effort was to identify an essential set of material properties for each type of pavement layer, assemble and process the data of the selected material properties, assess the percentage of missing values in the selected material properties gathered from the LTPP database, impute or assume missing material properties, and populate the LTPP ARMAD. In addition, a data source and variability indicator was assigned to each material property so users can understand the method used to obtain the material property and hence the associated data derivation method and variability. This document provides details concerning how ARMAD’s material properties were selected, how the ARMAD was populated, and what the resulting dataset contains. It could be used by researchers who will utilize the ARMAD dataset for their analyses. This document also provides references and resource documents to understand the overall LTPP materials sampling and testing program.
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