00668943

Component

http://onlinepubs.trb.org...trr/1994/1432/1432-005.pdf

https://scholar.google.co...rson&publication_year=1994

The operational theory of and the installation procedures for the instrumentation selected to monitor changes in internal pavement moisture and thermal regimes and external climate at test sections in the Long-Term Pavement Performance seasonal monitoring study are described. The instrumentation includes time-domain reflectometry probes to measure the moisture contents of unbound materials, thermistor sensors to measure pavement temperature gradients and air temperature, electrical resistivity probes to measure frost locations, a piezometer to measure the depth to the groundwater table, and a tipping bucket rain gauge to measure precipitation. These measurements of the external climate and the resulting changes in the pavement material will be coupled with monthly or more frequent deflection measurements, bimonthly roughness measurements, elevation profiles, and distress surveys to study the causes and effects of seasonal changes in the structural response of pavement. Preliminary results from the instrumentation pilot studies illustrating these types of seasonal effects are presented.

This paper appears in Transportation Research Record No. 1432, Innovations in Instrumentation and Data Acquisition Systems. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01401243

English

p. 32-43

1994-10

Transportation Research Record

0309055148

Figures (9) ; References (6) ; Tables (1)

Climate; Defects; Deflection; Heat; Instrumentation; Moisture content; Monitoring; Pavement distress; Pavement performance; Pavements; Piezometers; Rain gages; Roughness; Seasons; Structural analysis; Structural mechanics; Temperature; Temperature gradients; Test sections; Thermistors

Long-Term Pavement Performance Program

Seasonal variations; Structural response; Unbound materials

Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I42: Soil Mechanics

TRIS, TRB

Nov 8 1994 12:00AM

• AUTOMATIC STRESS PATH CONTROL SYSTEM FOR HOLLOW CYLINDER TORSIONAL TESTING OF SOILS
• CONCURRENT TUTORIALS AND APPLICATIONS
• DATA ACQUISITION SYSTEM AND COMPUTER CONTROL OF CALIBRATION CHAMBER TESTS ON SAND
• DESIGN AND DATA ACQUISITION FOR THERMAL CONDUCTIVITY MATRIC SUCTION SENSORS
• DEVELOPMENT OF MINIATURE EQUIPMENT FOR A SMALL GEOTECHNICAL CENTRIFUGE
• FIBER OPTIC PORE PRESSURE SENSOR DEVELOPMENT
• INSTRUMENTATION AND DATA ACQUISITION FOR FIELD SUCTION MEASUREMENT
• INSTRUMENTATION FOR REMOTE AND CONTINUOUS MONITORING OF STRUCTURE CONDITIONS
• INSTRUMENTATION OF A LANDFILL COVER TO MEASURE DEPTH OF FROST PENETRATION
• STATIC AND DYNAMIC MEASUREMENTS USING EMBEDDED EARTH PRESSURE CELLS
• USE OF AIR-REGULATING VALVES IN GEOTECHNICAL LABORATORY TESTING
• USING DEVICE-SPECIFIC DATA ACQUISITION FOR AUTOMATED LABORATORY TESTING