Simple analytical models are presented which are used to examine the theoretical behaviour of an axially reinforced concrete prism under tension pre and post-repair by resin injection. The effect of repair on the steel strain at the crack and the crack movement has been derived in terms of the resin modulus and the original crack width. The load sustained post-repair before recracking has been shown to be dependent upon the load at which repair is carried out and on the previous load history of the member. The experimental work was conducted using axially reinforced concrete prisms loaded in tension and monitored for strain. Plain and ribbed reinforcements were used. A novel part of the test program was that the repair and resin curing period of some members was undertaken while they were held under load, rather than at zero load. Most members tested were able to support, following repair, substantial proportions of the original cracking load before recracking occurred, although for ribbed bars, the post-repair load increment is sensitive to the success in repairing secondary cracking.
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- A Theoretical and Experimental Study of Concrete Members Repaired by Resin Injection
J. G. Keer
N. K. Emberson
- Springer US
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