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- W596186328 abstract "The objective of this project was to develop a joint repair detail that would function properly for a 10-year period. It was required that the repair be opened to traffic within eight hours and its construction would be adaptable to mass production techniques. As a first step to accomplish this goal, laboratory studies were conducted that led to the development of mechanized drilling of horizontal holes in the end faces of the existing slab. Connection to the existing slab was accomplished by grouting seven tie bars into drilled holes in the end faces of the existing slab. Load transfer was provided by sawing a 1/4 in. step at mid-depth of the slab. Length changes in the pavement were accommodated by installing a joint in the center of the repair. To obtain adequate eight-hour concrete strength a nine-sack concrete mix accelerated with calcium chloride was used. The developed techniques and materials were field tested, first on experimental installations conducted by Department personnel and then on a contract consisting of 2700 lane repairs. The experimental repairs utilizing step-cut tied joints proved successful and were specified in 2100 of the contract repairs. In the remaining 600 repairs, ten loose fitting dowels (1-5/16-in. diameter dowels inserted in 1-3/8-in. diameter holes) were used in the repair joints. Although the experimental repairs using step-cut end joints performed well, those installed under contract performed poorly. Nearly 70% of the repairs failed during the 7 years since their construction. The failures were found to have occurred in the epoxy grouted portion of the tie bars. Either the grout failed to harden (improper mix proportioning) or an insufficient amount of grout was provided. Since this project, new equipment for mixing and injecting grout in horizontal holes has been developed and grouted-in tie bars have been used successfully on several Michigan projects. Monitoring of the loose fitting dowels revealed that after 5 years service 98% of the joints have vertical offsets of less than 3/16 in. and the remaining 2% have offsets 1/4 in. or less." @default.
- W596186328 created "2016-06-24" @default.
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- W596186328 date "1989-06-01" @default.
- W596186328 modified "2023-09-24" @default.
- W596186328 title "PCC PAVEMENT JOINT RESTORATION AND REHABILITATION (FEDERAL HIGHWAY ADMINISTRATION NEEP PROJECT 27). FINAL REPORT" @default.
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