00237322

Component

http://onlinepubs.trb.org...s/hrr/1967/181/181-005.pdf

THE PLACEMENT IS DESCRIBED OF INSULATION UNDER A 9-IN. PORTLAND CEMENT CONCRETE HIGHWAY PAVEMENT. SPECIAL EMPHASIS WAS GIVEN TO THE PROBLEM OF UNIFORMLY RETARDING FROST PENETRATION UNDER THE ENTIRE SLAB WIDTH, I.E., TO ELIMINATE UNEVEN PENETRATION AT THE EDGE COMPARED WITH THE CENTER. RESULTS SHOWED THE DEFINITE REDUCTION IN FROST PENETRATION IN THE INSULATED SECTIONS, AND INDICATED THAT THE INSOLATION SHOULD BE EXTENDED BEYOND THE PAVEMENT EDGE TO OBTAIN THE DESIRED UNIFORMLY ATTENUATED PENETRATION. METHODS UTILIZED TO CARRY OUT THE RESEARCH INCLUDED (1) THE USE OF SIMULATION TECHNIQUES TO PREDICT FROST PENETRATION PATTERNS AND TO AID IN THE DESIGN OF THE TEST SITE, AND (2) THE ANALYSIS OF TEMPERATURE MEASUREMENTS TO LOCATE THE ACTUAL DEPTH OF FROST PENETRATION. EXCESSIVE COST ESTIMATES FORCED ATTENTION TOWARD MEANS OF SHORTENING THE TEST SITE LENGTH. THE PROBLEM OF DUPLICATING IN A SHORT TEST SITE THE HEAT TRANSFER CONDITIONS FOUND IN AN ACTUAL HIGHWAY IS DISCUSSED. TWO TEST SECTIONS, EACH 10 FT IN LENGTH AND DIVIDED BY VERTICAL INSULATION, WERE DESIGNED, CONSTRUCTED, AND MONITORED OVER ONE WINTER. RESULTS SHOWED THAT THE TEST SECTIONS SATISFACTORILY DUPLICATED THE HEAT TRANSFER CONDITIONS REQUIRED. DEFINITE USEFULNESS OF SIMULATION TECHNIQUES TO PREDICT FROST PENETRATION IS INFERRED. A RESEARCH METHOD IS SUGGESTED, WHEREBY THESE TECHNIQUES COULD BE FURTHER REFINED THROUGH SUCCESSIVELY DEVELOPED FIELD VERIFICATION, WHICH SHOWS PROMISE OF LEADING TO DESIGN APPLICATIONS. /AUTHOR/

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01410131

pp 77-93

1967

Highway Research Record

Digital/other

Figures (20) ; References (11) ; Tables (1)

Depth; Electric insulating materials; Frost; Insulating materials; Location; Pavements; Pendulum tests; Portland cement concrete; Simulation; Soil penetration test; Temperature measurement; Test sections

Frost penetration

Geotechnology; Highways; Pavements

TRIS, TRB

Feb 2 1994 12:00AM

• DESIGN CHARTS FOR COEFFICIENTS OF ACTIVE EARTH PRESSURE OF COHESIONLESS SOILS-A RAPID METHOD
• INFLUENCE OF SOIL PROPERTIES ON VOLUMETRIC CHANGE UNDER DYNAMIC LOADING
• STRESS DISTRIBUTION WITHIN AND UNDER LONG ELASTIC EMBANKMENTS
• UNUSUAL CASE OF EMBANKMENT FAILURE