An active application of a concrete track is expected for the future construction of railroads. For successful concrete track construction and operation in earthwork areas, the residual settlement should be reasonably controlled by using an appropriate method. The maintenance for excessive settlement is very difficult on the operating line because the maintenance method is very restrictive. The objective of this study is to introduce pressurized rapid-hardening cement grouting (PRCG) method to restore a subsided concrete track without any adverse effects on train operation. This method involves the use of special types of materials (very quick hardening and middle-hardening mortar), compact grouting equipment, and a special construction process. In spite of the extremely restrictive environment, this method has been demonstrated to be very effective and reasonable through laboratory and field tests.
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