OBSERVATION OF EXPANSIVE CLAYS IN ROADWAYS

EXPANSIVE CLAYS IN TEXAS ARE ESTIMATED TO CAUSE 9 MILLION DOLLARS IN DAMAGES TO STATE HIGHWAYS ANNUALLY. THIS AMOUNT OF MONEY REFLECTS ONLY THE MAINTENANCE COST ATTRIBUTABLE TO EXPANSIVE CLAYS AND NOT THE DEGRATION OF RIDE QUALITY AND SERVICEABILITY TO THE PUBLIC. ONE PURPOSE OF CURRENT STUDIES IS TO MAKE COMPARISONS OF FIELD OBSERVATIONS WITH PREDICTIVE METHODS IN ATTEMPTING TO REDUCE THIS ANNUAL MAINTENANCE BILL AND THE INCONVENIENE TO THE MOTORIST. FOUR DIFFERENT METHODS ARE AVAILABLE FOR REDUCING THE DETRIMENTAL EFFECTS OF SWELLING CLAYS: (1) REMOVAL OF THE CLAY; (2) CHEMICAL ALTERNATION; (3) ENCAPSULATION IN WATERPROOF MEMBRANES; AND (4) CHANGE OF THE WATER CONTENT TO THAT EXPECTED AFTER CONSTRUCTION. THE LAST METHOD IS BEING STUDIED MOST CLOSELY AT THIS TIME. OBSERVATIONS ARE MADE IN THIS REPORT OF TWO METHODS PROPOSED BY THE TEXAS HIGHWAY DEPARTMENT FOR CHANGING THE IN-SITU WATER CONTENT PRIOR TO CONSTRUCTION: DRY-LAND FARMING AND PONDING. A NUMERICAL TECHNIQUE FOR PREDICTING MOISTURE MOVEMENT IN UNSATURATED SOILS HAS ALREADY BEEN DEVELOPED. A LONG-TERM FIELD EXPERIMENT IS DESCRIBED IN THIS REPORT WHICH WILL PROVIDE A TEST COMARISON UNDER CONTROLLED CONDITIONS.

  • Supplemental Notes:
    • Proceedings, Workshop on Expansive Clays and Shales in Highway Design and Construction, Denver, Colorado, 1972. Available in 2 volumes from NTIS, PB-225842.
  • Corporate Authors:

    University of Wyoming, Laramie

    Wyoming Survey and Analysis Center, 710 Garfield
    Laramie, WY  United States  82070
  • Authors:
    • Stevens, J B
    • Matlock, H
  • Publication Date: 1973-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00233508
  • Record Type: Publication
  • Report/Paper Numbers: Workshop Proceedings
  • Files: TRIS
  • Created Date: Jul 31 1974 12:00AM