Long-Term Pavement Performance (LTPP) Data Analysis Support: "LTPP Computed Parameter: Moisture Content"

Project Description

Pavement structures are affected by variations in temperature and moisture as well as the presence of freeze/thaw cycles. However, the magnitude and impact of these variations, at least up until now, has not been clear. Because of this, the Seasonal Monitoring Program (SMP) was developed to collect sufficient data to enable analysis of the effect of these factors in terms of pavement performance. In order to obtain such information, extra data collection and monitoring effort must be expended. Therefore, only a limited number of LTPP sites were selected for inclusion in the program. An attempt was made to select sites in such a way that a representative sampling of surface type, subgrade type, and climate was achieved. There are four categories for pavement type: flexible-thin (less than 127 mm), flexible-thick (greater than 127 mm), rigid-jointed plain concrete, and rigid-jointed reinforced concrete. In addition, the subgrade soil can be classified as fine grain or coarse grained. Lastly, there are four climatic regions: dry freeze, dry non-freeze, wet freeze, and wet non-freeze.

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