ABSTRACT
The two-way, simply-supported, unbonded posttensioned slabs (with or without CFRP) were tested with uniformly distributed external loading. The 9′ − 0½′′ × 9′ − 0½′′ two way slabs (PTS-1, PTS-2
and PTS-6) were internally reinforced using mild steel and un-bonded post-tensioning strands each-way Table 1 (Figure 1 & Figure 13). The slabs repaired with CFRP are indicated as ‘‘CR’’. The two-way slabs were repaired using different strengthening schemes. Diagonal schemes are shown inFigure 4 andFigure 15, whichwasused forPTS-2CR(perpendicular to cracks). Orthogonal schemes were used in PTS-1CR & PTS-6 (parallel to slab edges). Slabs PTS-3 was an one-way slab with both ends fixed, PTS-4 was an one-way slab with one end fixed and PTS-5 was a simply supported one way slab. Pre-stressed strands and reinforcements for these slabs are shown in Table 1. The one-way slabs were strengthened (PTS-3CR, PTS4CR and PTS-5CR) with straight CFRP sheets at the top tension zone and at the support at bottom tension zone (1/4th clear span) as shown (Figures 5 & 6 and Figure 16). Details of CFRP materials are given in Table 2.
