00672564

Component

http://onlinepubs.trb.org...trr/1994/1447/1447-014.pdf

https://scholar.google.co...endo&publication_year=1994

Effectiveness of bitumen coating in mitigating downdrag in cohesionless soils was investigated using direct shear apparatus and a rod shear test. Tests on soft and stiff bitumen sheared with sand and crushed limestone showed that changes in temperature, shear-strain rate, and normal stress significantly affected the shearing characteristics of bitumen coating. Increasing the normal stresses caused an increase in the soil-particle penetration layer into the bitumen and altered the viscous behavior of the material. High friction resistance was recorded when crushed limestone was used to shear the bitumen layers. Stiff bitumen coating provided better protection against soil penetration than soft bitumen. However, at high temperatures, both bitumens lost their protective capabilities, resulting in a significant soil penetration into the bitumen coating. Bitumen-coated samples tested with sand exhibited the lowest friction. The effectiveness of bitumen coating in this case was 98%; it dropped to 54% when crushed limestone was used.

This paper appears in Transportation Research Record No. 1447, Design and Construction of Auger Cast Piles, and Other Foundation Issues. 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

01401277

English

p. 116-124

1994

Transportation Research Record

0309060532

Figures (9) ; References (10) ; Tables (2)

Bitumen; Bituminous coatings; Concrete; Crushed limestone; Downwash; Granular soils; Measures of effectiveness; Sand; Shear strain; Skin resistance; Soft rock; Stiffness; Stresses; Support piles; Temperature; Testing; Thermal stresses; Traffic mitigation

Effectiveness; Mitigation

Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls

TRIS, TRB

Jan 13 1995 12:00AM

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• ATLAS SCREW PILE: A VIBRATION-FREE, FULL DISPLACEMENT, CAST-IN-PLACE PILE
• BUCKLING OF FRICTION PILES SUPPORTING BRIDGE FOUNDATIONS
• DESIGN AND CONSTRUCTION OF AUGER-CAST PILES IN FLORIDA
• DESIGN AND CONSTRUCTION OF STARSOL PILES
• DETERMINING LENGTHS OF INSTALLED TIMBER PILES BY DISPERSIVE WAVE PROPAGATION
• FORMALIZED PROCEDURE FOR QUALITY ASSESSMENT OF CAST-IN-PLACE SHAFTS USING SONIC PULSE ECHO METHODS
• LRFD CODE FOR ONTARIO BRIDGE SUBSTRUCTURES
• MANAGING THE INSTALLATION OF AUGERED CAST-IN-PLACE PILES
• NEW TECHNIQUES FOR RELIABLE PILE INSTALLATION AND PILE BEHAVIOR DESIGN AND ANALYSIS
• REDUCED IMPACT ON ADJACENT STRUCTURES USING AUGERED CAST-IN-PLACE PILES
• REVIEW OF AUGERED PILE PRACTICE OUTSIDE THE UNITED STATES
• USE OF DEEP BLAST DENSIFICATION FOR BRIDGE FOUNDATION IMPROVEMENT ON SR-504