A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Cracked Structural Concrete Repair through Epoxy Injection and Rebar Insertion
The objective of this project was to develop a technique for repairing cracked structural bridge concrete. The method developed consists of sealing the crack, drilling holes at 45 degrees to the deck surface and crossing the crack plane at approximately 90 degrees, filling the hole and crack plane with epoxy pumped under low pressure, and placing a rebar into the drilled hole in a position to span the crack. The epoxy bonds the bar to the walls of the hole, fills the crack plane bonding the cracked concrete surfaces back together in one monolithic form, and thus reinforces the section. The epoxy injection equipment utilized was developed for hollow plane injection. Injection nozzles were built, and a large vacuum swivel was designed, developed, and built. Drilling to 7'(2.1m) depth was accomplished in 22 minutes on the first repair, and no significant gain was noted on the second. A total of 220'(67m) of number 4 rebar was epoxy bonded in 55 holes to repair 18 cracks in 8 girders of two bridges. The first bridge has been repaired for nearly two years, the second 9 months without failure. This test repair cost averaged $2000 per girder compared to a girder removal and replacement cost of $38,763 in 1975. Further development of implementation has reduced the cost to $1,000 per girder.
Cracked Structural Concrete Repair through Epoxy Injection and Rebar Insertion
The objective of this project was to develop a technique for repairing cracked structural bridge concrete. The method developed consists of sealing the crack, drilling holes at 45 degrees to the deck surface and crossing the crack plane at approximately 90 degrees, filling the hole and crack plane with epoxy pumped under low pressure, and placing a rebar into the drilled hole in a position to span the crack. The epoxy bonds the bar to the walls of the hole, fills the crack plane bonding the cracked concrete surfaces back together in one monolithic form, and thus reinforces the section. The epoxy injection equipment utilized was developed for hollow plane injection. Injection nozzles were built, and a large vacuum swivel was designed, developed, and built. Drilling to 7'(2.1m) depth was accomplished in 22 minutes on the first repair, and no significant gain was noted on the second. A total of 220'(67m) of number 4 rebar was epoxy bonded in 55 holes to repair 18 cracks in 8 girders of two bridges. The first bridge has been repaired for nearly two years, the second 9 months without failure. This test repair cost averaged $2000 per girder compared to a girder removal and replacement cost of $38,763 in 1975. Further development of implementation has reduced the cost to $1,000 per girder.
Cracked Structural Concrete Repair through Epoxy Injection and Rebar Insertion
F. W. Stratton (author) / R. Alexander (author) / W. Nolting (author)
1978
60 pages
Report
No indication
English
Welding cracked concrete with epoxy injection
| Tema Archive | 1981
Epoxy resin repair of cracked concrete beams
| TIBKAT | 1978