Studies on Penetration Properties of Repair Materials for Cracks in Concrete

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Title: Studies on Penetration Properties of Repair Materials for Cracks in Concrete

Author(s): T. Ilsaka., A sugiyama, and H. Umehara

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 727-740

Keywords: blast furnace slag; cracking (fracturing); impregnating; penetration tests; repairs; viscosity; Materials Research

Date: 11/1/1991

Abstract:
In the present study, materials for repairing cracks that occur in concrete structures are discussed. Up to now, organic materials have been used mainly to repair cracks in concrete, but these have problems of heat resistance and durability, etc. Therefore, to overcome these problems, blast furnace cement, which is an inorganic material from the same group as the constituent element of concrete, is chosen and used as an impregnating material by pulverizing it to an ultra-fine powder. The specific gravity of this material is 2.96, the average particle diameter is 2.9 micrometers, and the specific area equals 9500 cmý/g, which is almost three times that of normal cement. It is found that the viscosity of the blast furnace cement paste with a water-cement ratio equal to 70 percent is less than 35 MPa/s, which is almost the same viscosity as epoxy resin. Consequently, the paste of ultra-fine powder will be able to penetrate cracks like epoxy resin and is expected to be a suitable repair material.