00600677

Component

http://onlinepubs.trb.org...trr/1990/1259/1259-016.pdf

https://scholar.google.co...iner&publication_year=1990

In recent years, the Nevada Department of Transportation has observed cases of severe rutting during the first warm weather following a chip seal application. Cores from these pavements have shown evidence of severe stripping. Sealing the surface appears to accelerate moisture damage by trapping moisture that would otherwise escape in the pavement layers. This observation led to the hypothesis that rutting was occurring in the asphalt concrete layer owing to a loss of cohesion and shear strength as a result of moisture damage. To test this hypothesis, a preliminary study was undertaken to determine if moisture susceptibility was related to permanent deformation. Samples from behind the paver were collected from 20 Nevada construction projects during 1985 and 1986. These materials were compacted, and a preliminary creep test described by ASTM was performed to determine the permanent strain. Samples from each of these projects were moisture conditioned, and a strain ratio (i.e., conditioned percent strain divided by unconditioned percent strain) was developed to relate unconditioned to conditioned results. Conclusions from this research were that moisture conditioning appears to play a significant role in permanent deformation. A preliminary multiple regression equation was developed by using strain ratio and daily 18,000-lb equivalent single-axle loads (ESALs) to predict average project rut depth. This equation yielded a correlation coefficient of 0.70.

This paper appears in Transportation Research Record No. 1259, Chip Seals, Friction Courses, and Asphalt Pavement Rutting 1990.Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01410821

p. 169-177

1990

Transportation Research Record

0309050162

Figures (7) ; References (5) ; Tables (5)

Asphalt concrete; Chip seals; Creep tests; Deformation; Equations; Forecasting; Loss and damage; Moisture damage; Multiple regression analysis; Ruts (Pavements); Rutting; Strain (Mechanics); Stripping (Pavements); Water

Rut; Rut depth; Strain rate

Nevada

Nevada

Geotechnology; Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials; I36: Aggregates

TRIS, TRB

Oct 31 1990 12:00AM

• CHARACTERIZATION OF RUTTING POTENTIAL OF LARGE-STONE ASPHALT MIXES IN KENTUCKY
• CHIP SEALS FOR HIGH TRAFFIC PAVEMENTS
• CORRELATION BETWEEN FIELD AND LABORATORY PERFORMANCE OF LIQUID ASPHALT-BASED SEAL COATS
• DESIGN OF LARGE-STONE ASPHALT MIXES TO MINIMIZE RUTTING
• EFFECTS OF CRUSHED PARTICLES IN ASPHALT MIXTURES
• EFFECTS OF MAXIMUM AGGREGATE SIZE ON RUTTING POTENTIAL AND OTHER PROPERTIES OF ASPHALT-AGGREGATE MIXTURES
• ESTIMATING VOIDS IN A DOUBLE CHIP SEAL
• FLOW RATE AS AN INDEX OF SHAPE TEXTURE OF SANDS
• FRICTION COURSES FOR MODERATE TRAFFIC HIGHWAYS
• IMPROVING DURABILITY OF OPEN-GRADED FRICTION COURSES
• INFLUENCE OF AGGREGATE ON RUTTING IN ASPHALT CONCRETE PAVEMENTS
• LABORATORY AND FIELD STUDY OF PAVEMENT RUTTING IN SAUDI ARABIA
• RUT-RESISTANT ASPHALT CONCRETE OVERLAYS IN WISCONSIN
• USE OF GYRATORY TESTING MACHINE TO EVALUATE SHEAR RESISTANCE OF ASPHALT PAVING MIXTURE
• WASHINGTON STATE CHIP SEAL STUDY