| Title |
WINTER TENTING OF HIGHWAY PAVEMENTS; TEST PROGRAM AND DISCUSSION OF CAUSES AND MECHANISMS
|
| Accession No |
00812517 |
| Authors |
Kestler, M A; Krat, A S; Roberts, G E |
Corp. Authors
/ Publisher |
Cold Regions Research and Engineering Laboratory  ; New Hampshire Department of Transportation ; Federal Highway Administration
|
| Publication Date |
20001028 |
| Description |
61 p.;
Appendices(5); Figures; Photos; References; Tables |
| Languages |
English
|
| Abstract |
Tenting consists of localized frost heaving in the immediate vicinity of transverse pavement cracks. It produces a highly irregular riding surface, leads to premature pavement-surface deterioration, occurs on highways designed for high traffic volumes and to withstand freezing and thawing, and is frequently exhibited by pavements in otherwise good condition. The objective of the project discussed was to investigate causes and mechanics of the phenomenon. Several transverse cracks at four test sites were monitored for salt concentration, moisture content, subsurface temperature, freezing point depression, and heaving throughout several winter/spring seasons. Testing on New Hampshire highways was determined to be a near-surface phenomenon caused by a complex combination of factors, with the underlying cause being intrusion of road salt-sand mix into the base course. Available water (meltwater and precipitation serving as a transport medium), cracked asphalt (providing a water entry point), salt-sand mix (for winter road maintenance), freeze-thaw cycling of the base course (due to temperature fluctuations and saline-induced freezing point depression), and the phase diagram of NaCl (salt coming out of solution as freezing occurs, thereby increasing salt concentration adjacent to the freezing front, increasing the freezing point depression even further) all appear to be necessary components for tenting to occur. |
| TRT Terms |
Freezing ; Frigid regions ; Frost heaving ; Mechanics ; Sodium chloride ; Thaw ; Transverse cracking |
| Subject Areas |
H24 PAVEMENT DESIGN AND PERFORMANCE; H64 SOIL SCIENCE; I22 Design of Pavements, Railways and Guideways; I23 Properties of Road Surfaces; I42 Soil Mechanics |
| Contract Number |
SPR-0004(6) |
| Report Number |
FHWA-NH-RD-12323C,; Final Report |
| Availability |
National Technical Information Service |
| URLs |
|
| TRIS Files |
HRIS; NTL |
| Database |
TRIS Online |
TRT
