EVALUATION OF CONCRETE PAVEMENT WITH LANE WIDENING, TIED CONCRETE SHOULDERS, AND THICKENED PAVEMENT
Field and laboratory pavements were instrumented and load tested to evaluate the effect of lane widening, concrete shoulders, and slab thickness on measured strains and deflections. Eight slabs were tested in the field and two in the laboratory. Pavement slabs were 8-, 9-, or 10-in. thick. Other major design variables included the width of lane widening, presence or absence of dowels, presence or absence of a concrete shoulder, joint spacing, and the type of shoulder joint construction. Generally, there was good agreement between measured strains and deflections and values calculated using Westergaard's theoretical equations. Concrete shoulders were effective in reducing the magnitude of measured strains and thickness of the outer lane of the mainline pavement that may be permitted with a tied concrete shoulder. Lane widening of about 16-in. was as structurally effective as a full concrete shoulder in reducing edge strains and deflections. A minimum of 1.5 ft widening plus any additional width required to avoid encroachments, is recommeded by the author, although greater width may be desireable for drainage continuity. Tied butt, tied keyed, and keyed joint construction were equally effective in reducing pavement strains and deflections due to load.
Skokie, IL United States 60077
Minnesota Department of HighwaysTransportation Building
St Paul, MN United States 55755
- Colley, B E
- Publication Date: 1977-9
- Pagination: 55 p.
- TRT Terms: Concrete pavements; Deflection; Joints (Engineering); Pavement widening; Pavements; Paving; Road shoulders; Strain (Mechanics); Thickness; Traffic lanes
- Uncontrolled Terms: Pavement thickness
- Old TRIS Terms: Joint; Lanes; Strains; Widening pavement
- Subject Areas: Highways; Pavements;
- Accession Number: 00303416
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: FHWA-MN-79/06 Final Rpt.
- Contract Numbers: MN 08-342
- Files: TRIS, STATEDOT
- Created Date: Feb 11 1980 12:00AM