Flexural behavior of self-compacting concrete voided slabs under monotonic loads

Abstract

This research is devoted to investigate the experimental behavior of normal and moderately high strength self-compacted concrete (SCC) voided slab strips under monotonic loading regimes. Five one-way simply supported slabs were tested including one as a reference slab (solid slab) and the remaining four as voided slabs with three cases of reduction in cross sectional area (6.5%, 13.1% and 14.7%) by creating longitudinal, 3 voids of 50 mm diameter, 6 voids of 50 mm diameter and 3 voids of 75 mm diameter, respectively. The experimental results revealed that for moderate thick reinforced normal SCC one way slab (3 void, dia. =75mm), the ultimate load was reduced by about 20% and the deflection at ultimate load was decreased by about 11% relative to the reference solid slab. While for similar voided slab of moderate high strength SCC, the ultimate load was increased by about 48.3% and the deflection at ultimate load also raised by about 27% with respect to normal strength SCC slab. In addition, the experimental results indicated that for moderate thick reinforced normal SCC one way slab having (3 voids, dia. =50 mm), the ultimate strength was reduced by about 6.7% and the deflection at ultimate load was reduced by 38%, when compared to the solid reference slab. However, for similar slab with (6 void, dia. =50 mm), the reduction in the ultimate strength and deflection at ultimate load were about 9.3% and 42%, respectively.