SUMMARY ROADWAY FAILURE STUDY NO. II

THE RELATIONSHIP OF ASPHALT AGING TO THE ALTERATION OF MIXED PROPERTIES AND TO THE VARIATION IN FREQUENCY OF LATERAL CRACKING WAS EXAMINED. THE SPECIFIC PHASES OF STUDY WERE: (1) ESTABLISHMENT OF SAMPLE SITES AND OBSERVATION OF PAVEMENT CHARACTERISTICS, (2) EXAMINATION OF DIFFERING PERFORMANCE WITHIN A SINGLE PROJECT TO BE MADE ON THE BEACON HILL PROJECT, (3) EXAMINATION OF THE EFFECT OF MIX COMPOSITION ON PAVEMENT PERFORMANCE INCLUDING ANALYSIS OF RECOVERED ASPHALTS AS WELL AS PREPARED MIXES, AND (4) LABORATORY DETERMINATION OF STRESS-STRAIN RESPONSE OF PAVEMENT SAMPLES AND ADDITIONAL WARPING STRESS COMPUTATIONS. THREE FIELD TEST SITES WERE OBSERVED TO DETERMINE: (1) THE ACTUAL TEMPERATURE EXPERIENCED BY IN-SERVICE PAVEMENTS, (2) THE DEGREE OF ASPHALT HARDENING LEADING UP TO LATERAL CRACKING, AND (3) TO MAKE FURTHER OBSERVATIONS OF PAVEMENT EXPANSION BY MEANS OF ARTIFICIAL CRACKS. IT WAS CONCLUDED FROM SURFACE ELEVATION MEASUREMENTS THAT THE ELIMINATION OF CEMENT TREATMENT RESULTED IN SOMEWHAT GREATER SURFACE DEPRESSION, ALTHOUGH NO DETRIMENTAL EFFECTS HAVE AS YET RESULTED. THE SAWED, ROUTED AND SEALED JOINT IS FELT TO BE A PRACTICAL CONSTRUCTION PROCEDURE OF REASONABLE CAUSE WORTHY OF CONSIDERATION AND FURTHER EVALUATION. STUDIES WERE CONTINUED ON THE PREVIOUSLY INITIATED EXTENSIVE FIELD EXPERIMENTAL SITES TO DETERMINE THE SOURCE OF WATER INFILTRATION IN EXPANSIVE CLAY SUBGRADE. THE FOUR SUBJECTS INVESTIGATED WERE: (1) SOURCES OF WATER INFILTRATING AN EXPANSIVE CLAY SUBGRADE BY CONTINUING ACQUISITION OF DATA FROM THE FIELD SITES, (2) STABILIZATION OF EXPANSIVE CLAY SOIL USING UNTRIED AGENTS WITH EFFORTS FOCUSED ON FINDING AN AGENT WHICH WOULD MIGRATE, (3) SWELL POTENTIAL OF INSITU EXPANSIVE CLAY-SHALE, TO DETERMINE THE RELATIONSHIP OF SWELL CHARACTERISTICS OF REMOLDED SOIL, AND (4) EVALUATION OF POTENTIAL SUBGRADE SURFACE SEALANTS. IT IS CONCLUDED THAT TRENDS IN MOISTURE CHANGE OCCUR AND ARE OCCURING WHICH BEGIN TO SHOW THAT THE SOURCE OF WATER INFILTRATING EXPANSIVE CLAY SUBGRADES IS FROM A SURFACE SOURCE. IN THE ABSENCE OF PAVEMENT CRACKING, THIS SURFACE SOURCE STILL EXISTS THROUGH THE SHOULDER AREAS AND SIDE SLOPES. NO AGENT WAS FOUND WHICH WOULD COMPARE WITH LIME IN REDUCING SWELL AND WHICH WOULD MIGRATE INTO THE REMOULDED SOIL. PENEPRIME AND CATALYTIC BLOWN ASPHALT PROVE TO BE EFFECTIVE SEALANTS UNDER LABORATORY CONDITIONS. REFERENCES: ROADWAY FAILURE STUDY NO. II, LATERAL CRACKING OF ASPHALTIC CONCRETE, FINAL REPORT, AUGUST 1967. ROADWAY FAILURE STUDY NO. II, BEHAVIOR AND STABILIZATION OF EXPANSIVE CLAY SOILS, FINAL REPORT, AUGUST 1967.

  • Supplemental Notes:
    • Final Rept, HWY ENGR RES PUBL H-19, 30 PP, 3 FIG
  • Corporate Authors:

    University of Wyoming, Laramie

    Natural Resources Research Institute
    Laramie, WY  USA  82071

    Wyoming State Highway Department

    ,    

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  USA  20590
  • Authors:
    • Lamb, D R
    • SCOTT, W G
    • Gietz, R H
    • Armijo, J D
  • Publication Date: 1967-8

Subject/Index Terms

Filing Info

  • Accession Number: 00210744
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Mar 18 1994 12:00AM