An Experimental Study on the Factors Affecting Injection Properties during Concrete Crack Repair

Abstract

This paper describes the results of laboratory experiments of injecting epoxy resins into concrete cracks using cylindrical specimens and concrete flat plates (JIS standard) with controlled crack width, in order to study the factors affecting the injection behavior of crack repair materials. As the result, it was confirmed that the areal velocity of an injection material into a crack is proportional to the square of the crack width, to the injection pressure and to the reciprocal of the material viscosity, as has been shown by past research. Furthermore, the results show the possibility that injection velocity is affected by crack surface roughness, and the degree of influence is also affected by crack width. In addition, it was found that the loss of injection pressure in the injection system is an important parameter in order to predict injection velocity.