A FUNDAMENTAL STUDY ON THE PREDICTION OF INJECTION TIME AND INJECTION VOLUME DURING CONCRETE CRACK REPAIR

Abstract

In this study, a quantitative examination was carried out to determine how crack surface roughness affects the injection velocity (injection areal velocity) during crack repair by injection. The authors propose a modification to the formula for determining the injection areal velocity proposed in past research. This paper describes the results of an examination focusing on the prediction of injection time and injection volume in order to improve the planning and management of injection methods. The results confirmed that it is possible to predict approximately the injection time and the injection volume by considering the crack surface roughness on the formula for injection velocity. Furthermore, the result shows that there will be other factors affecting the injection velocity besides the crack width, the injection pressure, the material viscosity and the crack surface roughness, and shows the need to constrain the applicability of the proposed formula.