Method of Repairing Concrete Slabs Using High-Performance Concrete

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Title: Method of Repairing Concrete Slabs Using High-Performance Concrete

Author(s): N. Maruyama, M. Yurugi, H. Konishi, and Y. Murahashi

Publication: Special Publication

Volume: 149

Issue:

Appears on pages(s): 289-310

Keywords: aggregates; high-performance concretes; hysteresis; moisture; mortars (material); panels; repairs; slabs; slump; Construction

Date: 10/1/1994

Abstract:
When a damaged concrete slab is repaired, new concrete will generally be placed in a downward direction. Form panels must be set up first under the damaged concrete slab, and then concrete must be placed between the form panels and the damaged slab. However, compaction by vibrator is needed in most concrete (slump: 8 to 21 cm), and therefore concrete placement under a damaged slab that needs repair is impossible realistically. A repair method using high-performance concrete without vibration or compaction was developed. The method was applied to the repair of concrete slabs that had been damaged by heat. It was confirmed that this repair method was easier and that repair was possible while the slab was in use. In addition, the costs and construction period were reduced greatly by this repair method.