RESTORATION TECHNIQUES FOR CONCRETE TRACK SETTLEMENT

초록

The intention of this study is develop the pressurized rapid-hardening cement grouting(PRCG) method to restore the subsided concrete track without harmful effect to train operation. This method consist of special types of materials (very quick hardening and middle hardening mortar), compact grouting equipment and a construction process. This method is demonstrated by a field test. Also, this paper proposes the technique of impact echo and the FRACTAL(Flexural-Rigidity Assessment of Concrete Tracks by Anti-Symmetric Lamb Waves) method. Impact echo is used to evaluate the filling capacity of the materials and FRACTAL is used to evaluate a weak stiffness underneath the trackbed.