Study on Flexural Behaviour of RCC Slab Filled with Hollow Roofing Tiles

The whole weight of the building is very much influenced by the self- weight of the reinforced concrete. In order to reduce the amount of concrete and self-weight of slabs, normally preferred slabs are voided slabs or hollow slabs. Such slabs have inherent benefits including reduced weights, economical longer spans, reduced floor-to- floor heights etc. Cost reductions in roofs/ floors are achieved through the adoption of filling a part of concrete in tension zone with cheaper substitutes. Roof tiles are better substitutes; here the concrete consumption as well as reinforcement could be significantly controlled. In this paper a hollow roofing tile is used as a filler material so that portion of concrete below the neutral axis can be replaced by these materials. Flexural behaviour of the slab is conducted using the loading frame equipment. The test specimen consists of a solid slab as a reference slab, a hollow core slab with fully covered hollow roofing tile on the bottom region, and a hollow core slab with hollow roofing tile only on all the four edges. The diameters of the steel reinforcement used are 8mm and 6mm deformed bars. The slab thickness was 13 cm. The results showed that hollow core slab can reduce the weight as compared to the solid slab. Flexural strength of hollow core slab with hollow roofing tile only on all the four edges is having higher value than the hollow core slab with fully covered hollow roofing tile on the bottom region; whereas these are lower than the solid slab. The value of ultimate loading capacity of solid slab is greater than the hollow concrete slabs. However, the hollow slab satisfies the design criteria.