FIELD AND LABORATORY EVALUATION OF SILICA FUME MODIFIED CONCRETE BRIDGE DECK OVERLAYS IN OHIO
The objective of this study was to evaluate, under field and laboratory conditions, the properties of silica fume modified concrete (SFMC) mixes that are currently used by the Ohio Department of Transportation (ODOT) for bridge deck overlays. These mixes have been used with increasing frequency for overlays in Ohio since 1984. The research methods included construction monitoring of nine overlay placement projects, field evaluations of existing overlaid decks, and preparation and testing of laboratory SFMC mixes using materials obtained from the construction monitoring projects. The field evaluations consisted of visual inspections of 145 decks, and in-depth condition surveys of 28 decks to determine the extent of any delamination/debonding and to obtain core samples for laboratory testing. Based on the information collected in this study, it was concluded that the early performance of SFMC overlays in Ohio has generally been very good. None of the examined overlays, which ranged in age from one to six years, exhibited spalling or patching. The most frequently observed distress was cracking of the overlay, which was observed on approximately 19% of the overlays that were visually inspected. The cracking was considered to be the result of drying shrinkage in most cases. The results of laboratory testing indicated that the SFMC mixes show low permeabilities and very high compressive strengths. Recommendations are provided regarding the mix design and construction specifications, with the intent being to reduce the potential for drying shrinkage.
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Corporate Authors:
CTL Engineering, Incorporated
2860 Fisher Road
Columbus, OH United States 43204Ohio Department of Transportation
25 South Front Street
Columbus, OH United States 43215Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Abdulshafi, O A
- Fitch, M G
- Publication Date: 1995-7
Language
- English
Media Info
- Features: Appendices; Figures; References; Tables;
- Pagination: 245 p.
Subject/Index Terms
- TRT Terms: Admixtures; Bridge decks; Compressive strength; Condition surveys; Construction; Cracking; Debonding; Delamination; Field tests; Inspection; Laboratory tests; Mix design; Overlays (Pavements); Permeability; Recommendations; Shrinkage; Silica fume; Specifications; Vision
- Uncontrolled Terms: Construction specifications
- Old TRIS Terms: Shrinkage cracks
- Subject Areas: Bridges and other structures; Construction; Design; Highways; Materials; Research; I24: Design of Bridges and Retaining Walls; I32: Concrete;
Filing Info
- Accession Number: 00725542
- Record Type: Publication
- Report/Paper Numbers: FHWA/OH-95/027, Final Report
- Contract Numbers: State Job 14508(0)
- Files: TRIS, ATRI, USDOT, STATEDOT
- Created Date: Sep 9 1996 12:00AM