Repair Systems for High-Strength Concrete

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Title: Repair Systems for High-Strength Concrete

Author(s): Erhard G. F. Chorinsky

Publication: Special Publication

Volume: 121

Issue:

Appears on pages(s): 735-740

Keywords: adhesives; bond (concrete to concrete); floors; resurfacing; high-strength concretes; mortars (material); plasticizers; repair; Construction

Date: 11/1/1990

Abstract:
Concrete repair materials applied in thin layers often fail under severe weathering conditions and high loading due to sensitivity in the bonding area to water, alkalinity, and mechanical strain. High-strength concrete, with its dense cement matrix, makes it even more difficult to connect repair materials to the old concrete. More than 15 years of experience in development and use of different systems for repair of high-strength concrete has shown that cementitious mortars with modification by high amounts of superplasticizers perform best. Practical aspects of application are shown on a large project carried out on a high-strength concrete floor in an airplane hangar. Cementitious repair systems are suitable for any kind of high-strength concrete repair where adequate surface preparation and the application of a special cementitious bridging agent is provided, but have to be adopted to the individual job site conditions. Shrinkage compensation techniques and sophisticated curing methods have to be used to achieve improved results with respect to drying shrinkage cracking. The durability of high-strength floor repairs with new technologies, used on a large scale in Europe, has proved to be reliable even under severe service conditions.