TEMPERATURE AND MOISTURE VARIATIONS IN CONCRETE PAVEMENTS

THE DATA HAVE BEEN ARRANGED TO SHOW THE FOLLOWING: (1) WEEKLY MAXIMUM AND MINIMUM AIR TEMPERATURES AND THE CORRESPONDING MAXIMUM AND MINIMUM TEMPERATURES IN THE CENTER OF THE SLAB; (2) RELATION BETWEEN DAILY RANGE IN AIR TEMPERATURE AND DAILY RANGE IN CENTER-OF-SLAB TEMPERATURE; (3) TYPICAL HOURLY DIFFERENTIALS IN TEMPERATURE BETWEEN TOP AND BOTTOM OF SLAB FOR THE PERIOD WHEN THE DIFFERENCE WAS A MAXIMUM; (4) THE DURATION OF THE VARIOUS TEMPERATURE DIFFERENTIALS BETWEEN TOP AND BOTTOM OF SLAB IN PERCENTAGE OF THE TOTAL TIME FOR ONE YEAR; (5) THE NUMBER OF TIMES DURING THE YEAR THAT THE VARIOUS TEMPERATURE DIFFERENTIALS OCCURRED; (6) PERCENTAGE OF TOTAL ANNUAL TIME THAT INDICATED TEMPERATURE DIFFERENTIALS BETWEEN TOP AND BOTTOM OF SLAB OCCURRED DURING EACH MONTH; (7) SAME AS 6, ONLY FOR THE HOURS OF THE DAY; (8) TEMPERATURE GRADIENT FROM TOP TO BOTTOM OF SLAB; (9) NUMBER OF FREEZING AND THAWING CYCLES DURING ONE WINTER AND ALSO RATES OF FREEZING AND THAWING; (10) CUMULATIVE DEGREE-DAYS AIR TEMPERATURE AND FROST PENETRATION INTO SUBGRADE; (11) PERCENTAGE OF MOISTURE IN CONCRETE. THIS INFORMATION IS OF VALUE IN COMPUTING MOVEMENTS OF SLAB OR STRESSES DUE TO AVERAGE TEMPERATURE AND MOISTURE CHANGES AND FOR WARPING STRESSES DUE TO TEMPERATURE DIFFERENCES WITHIN THE SLAB. THE TIME FACTOR AS TO MONTH AND TIME OF DAY MAKES IT POSSIBLE TO CORRELATE THESE DATA WITH TRAFFIC SURVEY DATA AND COMPUTE THE PROBABLE COMBINED LOAD AND WARPING STRESSES THAT MAY OCCUR DURING THE EXPECTED LIFE OF THE PAVEMENT. THE DATA ON FREEZING AND THAWING AND RATES OF FROST PENETRATION MAY AID IN DETERMINING WHICH LABORATORY CYCLE TO ADOPT AND ALSO THE RELATIONSHIP BETWEEN THE NUMBER OF LABORATORY CYCLES AND THE NUMBER OF YEARS OUTSIDE EXPOSURE. /AUTHOR/

  • Supplemental Notes:
    • Vol 21, pp 260-271, 14 FIG
  • Authors:
    • Lang, F C
  • Publication Date: 1942

Media Info

  • Monograph Title: Proceedings of the Twenty-First Annual Meeting of the Highway Research Board Held at the Johns Hopkins University, Baltimore, Maryland, December 2-5, 1941
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00207283
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 27 1971 12:00AM