Fig. (3) Schematic layouts of retrofit configurations (tension face upward): (a) 8 two-way grooves to be filled with HPFRCC in slab type D, (b) 8 in-situ two-way HPFRCC strips cast over the tension face in slab type E and (c) 4 one-way grooves to be filled with HPFRCC and 4 precast HPFRCC strips attached over the tension face in the perpendicular direction in slab type F.