FINAL SUMMARY REPORT: BEHAVIOR OF SHRINKAGE COMPENSATING CONCRETES SUITABLE FOR USE IN BRIDGE DECKS
The objective of this research was to determine if the use of shrinkage-compensating concrete in bridge decks minimizes cracking and the subsequent spalling caused by rusting of the steel reinforcing. The magnitude of expansion is influenced significantly be length of and methods of storing the shrinkage-compensating cement, choice of admixtures, mixing time, curing procedures and degree of restraint. The magnitude of expansion is approximately the same in specimens 3-in. (75-mm) to 8-in. (200-mm) thick if the restraint is the same and if good curing procedures are followed. The simulated bridge deck specimens made with shrinkage-compensating cements did not crack, or had only a few cracks when compared to the specimens made with Type 1 cement. The rate of corrosion of the reinforcing was about the same for both of the concretes but was greater at cracked sections than at uncracked sections. The porosity of the shrinkage-compensating concrete was found to be about 20 percent greater than that of the Type 1 concrete, but the chloride ion concentration was approximately the same at a given depth. The elimination of cracks by using shrinkage-compensating cement concrete will prevent the rapid corrosion of the reinforcement and subsequent spalling in a bridge that occurs at a crack, and extend the life of the deck before repairs are needed.
- Sponsored by Illinois Department of Transportation in cooperation with DOT, Federal Highway Administration.
University of Illinois, Urbana-ChampaignDepartment of Theoretical and Applied Mechanics
Urbana, IL USA 61801
- Cusick, R W
- Kesler, C E
- Publication Date: 1977-4
- Pagination: 33 p.
- TRT Terms: Admixtures; Bridge decks; Concrete; Concrete curing; Corrosion; Costs; Cracking; Design; Expansive concrete; Handling and storage; Reinforcing steel; Spalling; Storage facilities
- Uncontrolled Terms: Concrete cracking
- Old TRIS Terms: Design costs
- Subject Areas: Design; Finance; Freight Transportation; Highways; Materials; Terminals and Facilities;
- Accession Number: 00158113
- Record Type: Publication
- Source Agency: Federal Highway Administration
- Report/Paper Numbers: FHWA-IL-77-UI-165 Final Rpt.
- Contract Numbers: IHR 405
- Files: TRIS, USDOT
- Created Date: Oct 13 1977 12:00AM