|FHWA > Engineering > Pavements > Publications| Primary Topic:
Pavement Base and Subbase Description: To better understand the
environmental factors and their effects on pavement performance,
the Long-Term Pavement Performance (LTPP) Seasonal Monitoring
Program (SMP) was initiated during 1992. Sixty-four LTPP
pavement sections were identified to be included in the SMP.
These sections are monitored frequently to acquire data on
seasonal variation in pavement conditions. As part of this
program, work is being performed to identify and monitor the
freeze state in the base, subbase, and subgrade at the SMP
sections located in the freeze zone in the United States and
Canada. This work makes use of temperature sensors and
electrical resistivity techniques. The main goal of the study
reported here was to determine frost penetration at the selected
SMP sections. As part of the study, an interactive computer
program, FROST, was developed to facilitate the interpretation
of the electrical resistivity and temperature da