THERMAL ACTIVITY OF BASE COURSE MATERIAL RELATED TO PAVEMENT CRACKING
An initial computer study using a heat transfer program showed that freeze-thaw activity during a winter, for Perryton, Texas, was centered mainly in the base course for a typical pavement. Comprehensive freeze-thaw testing showed the base course to be more active, thermally, than asphaltic concrete. The thermal activity is composed of a freeze deformation and a residual deformation. Both quantities are related to the soil moisture suction of the material. The soil moisture suction which develops in a sample is a function of the grain size, moisture, pore structure and clay mineralogy. Clay mineralogy determinations were done using x-ray diffraction to obtain the relative percentages of the clay minerals present. A direct relationship is established between the freeze deformation and clay mineralogy of the material tested. The data also demonstrate the validity of using clay mineralogy properties as a design quantity for base course material.
- Prepared in cooperation with Texas State Dept. of Highways and Public Transportation, Austin.
Arlington, TX United States 76011
Washington, DC United States 20590
Texas State Department of Highways & Public TranspP.O. Box 5051
Austin, TX United States 78763
- Carpenter, S H
- Lytton, R L
- Publication Date: 1975-12
- Pagination: 128 p.
- TRT Terms: Base course (Pavements); Clay minerals; Cold weather; Concrete; Design; Diffraction; Durability; Field tests; Flexible pavements; Fracture mechanics; Freezing; Heat transfer; Highways; Operations; Pavement cracking; Properties of materials; Soils; Testing; Thermal properties; Thermal stability; X rays
- Uncontrolled Terms: Soil properties; X-ray diffraction
- Geographic Terms: Texas
- Subject Areas: Administration and Management; Design; Geotechnology; Highways; Materials; Pavements;
- Accession Number: 00137323
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: TTI-2-8-73-18-2 Res. Rpt., FHWA/RD-S0478
- Files: TRIS, USDOT, STATEDOT
- Created Date: Sep 16 1977 12:00AM