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Chapter 8. Seasonal Monitoring Program
8.1 Introduction to SMP
The purpose of the SMP is to obtain a fundamental understanding of the magnitude and impact of temporal variations in pavement response and material properties due to the separate and combined effects of temperature, moisture, and frost/thaw variations.
The SMP program includes an increased monitoring frequency of deflection, longitudinal profile, and distress surveys on selected sites in the LTPP program. The collection of deflection data involves a different protocol requiring testing to be performed on a portion of the test section using different test spacing than was used for the routine testing on the full test section. In addition to the increased monitoring frequency, other measurements—including prevailing weather conditions at the site, depth of frost penetration, temperature gradient, soil moisture, rainfall, ambient temperature, and surface elevation measurements—are also made at these sites. SMP data collection activities have been terminated per directive GO–36 effective October 31, 2004.
8.2 References Used in Collecting SMP Data
In 1995, section 3.5 was added to chapter 3 of the DCG to provide for collection of data as part of the SMP. The reference for this section is as follows. This section provides a general overview of data to be collected at these sites.
- Data Collection Guide for Long-Term Pavement Performance Studies, Operational Guide No. SHRP-LTPP-OG-001, FHWA, Pavement Performance Division, McLean, VA, January 1995.
8.2.1 References Detailing the SMP Instrumentation and Data Collection
The following documents provide specific information about the instrumentation and data collection efforts related to the SMP.
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LTPP Seasonal Monitoring Program: Instrumentation, Installation, and Data Collection Guidelines, Version 2.1, FHWA, Pavement Performance Division, McLean, VA, April 1994.
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LTPP Seasonal Monitoring Program: Instrumentation, Installation, and Data Collection Guidelines, FHWA Report No. FHWA-RD-94-110, FHWA, Pavement Performance Division, McLean, VA, January 1995.
This set of guidelines was modified August 7, 1998 by adding appendix A: "Time Domain Reflectometry (TDR) Classification and Interpretation."
- LTPP Seasonal Monitoring Program: Instrumentation, Installation, and Data Collection Guidelines, FHWA Report No. FHWA-RD-94-110, FHWA, Pavement Performance Division, McLean, VA, August 7, 1998.
In 1999, a second phase was developed for the SMP. The objective was to provide additional information about the diurnal, seasonal, and annual variations in pavement response. Appendix C: "Guidelines for SMP Phase II Equipment and Instrumentation Installation" was added to the guidelines as of April 10, 2000. This appendix covered the data collection requirements for the second phase of the SMP.
- LTPP Seasonal Monitoring Program: Instrumentation, Installation, and Data Collection Guidelines, FHWA Report No. FHWA-RD-94-110, FHWA, Pavement Performance Division, McLean, VA, April 10, 2000.
8.2.2 References for SMP Software Manuals
Several pieces of software were used by the SMP. Documentation for these software items includes the following.
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LTPP Seasonal Monitoring Program ONSFIELD Users Guide, Version 1.2, FHWA, Pavement Performance Division, McLean, VA, June 1996.
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LTPP Seasonal Monitoring Program: ONSFIELD Users Guide, Version 2.0, FHWA, Pavement Performance Division, McLean, VA, December 1999.
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LTPP Seasonal Monitoring Program MOBFIELD Users Guide, Version 2.4, FHWA, Pavement Performance Division, McLean, VA, January 10, 1997.
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LTPP Seasonal Monitoring Program: MOBFIELD Users Guide, Version 3.0, FHWA, Pavement Performance Division, McLean, VA, December 1999.
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LTPP Seasonal Monitoring Program ONSPLUS Users Guide, Version 1.05, FHWA, Pavement Performance Division, McLean, VA, April 14, 2000.
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LTPP Seasonal Monitoring Program ONSPLUS Users Guide, Version 1.08, FHWA, Pavement Performance Division, McLean, VA, February 23, 2001.
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LTPP Seasonal Monitoring Program SMPCheck Users Guide, Version 2.5 , FHWA, Pavement Performance Division, McLean, VA, October 28, 1996.
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LTPP Seasonal Monitoring Program: SMPCheck Users Guide, Version 5.0, FHWA, Pavement Performance Division, McLean, VA, January 2000.
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