Fundamental Studies on Inorganic Materials for Crack Injection

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Title: Fundamental Studies on Inorganic Materials for Crack Injection

Author(s): T. Kato, H. Umehare, and H. Yoshida

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 707-726

Keywords: beams (supports); blast furnace slag; concretes; repairs; cracking (fracturing); epoxy resins; inorganic compounds; plasticizers; repairs; Materials Research

Date: 11/1/1991

Abstract:
In repairing cracked concrete structures, excellent workability and repairing effects have been obtained by using epoxy resins that are liquid organic polymer materials. However, in most situations, the repairing effects are not long-term and when these organic materials are used and exposed outside for a few years, they will deteriorate. Therefore, a material for crack injection, utilizing inorganic material such as ultra-fine slag cement, has been developed recently, and has shown good performance in terms of workability and durability. In this study, plain concrete beams and reinforced concrete beams repaired by using epoxy resin or ultra-fine slag cement are tested. The results show that the repairing effect deteriorates because of bleeding or drying shrinkage when inorganic material is used with a great deal of water. However, satisfactory properties are obtained using superplasticizer added to the inorganic repair material.