Bending Strength of Steel Fibre Reinforced Concrete Ribbed Slab Panel

Abstract

Nowadays, demands in the application of fibre in concrete increase gradually as an engineering material. Rapid cost increment of material causes the increase in demand of new technology that provides safe, efficient and economical design for the present and future application. The introduction ofribbed slab reduces concrete materials and thusthe cost, but the strength of the structure also reduces due to the reducing of material. Steel fibre reinforced concrete (SFRC) has the ability to maintain a part of its tensile strength prior to crack in order to resist more loading compared to conventional concrete. Meanwhile, the ribbed slab can help in material reduction. This research investigated on the bending strength of 2-ribbed and 3-ribbed concrete slab with steel fibre reinforcement under static loading with a span of 1500 mm and 1000 mm x 75 mm in cross section. An amount of 40 kg/m steel fibre of all total concrete volume was used as reinforcement instead of conventional bars with concrete grade 30 N/mm2. The slab wastested underthree-point bending. Load versus deflection curve was plotted to illustrate the result and to compare the deflection between control and ribbed slab. Thisresearch showsthat SFRCRibbed Slab capable to withstand the same amount of load as normal slab structure, although the concrete volume reduces up to 20%.

A Brief Review of Steel Fiber Self-Compacting Concrete in Ribbed Slab

“…The results also revealed that there was no damage at the interface between the pre-cast unit and the topping concrete, and that the composite specimens behaved like full composites. Steel fiber as the main reinforcements in reinforced concrete (SFRC) was also explored by others [9,10]. Both studies on the flexural performance of ribbed slab by considering normal strength concrete (fck = 30 N/mm 2 ) reinforced with 0.5% (40 kg/m 3 ) volume fraction of steel fibers.…”

“…Both studies on the flexural performance of ribbed slab by considering normal strength concrete (fck = 30 N/mm 2 ) reinforced with 0.5% (40 kg/m 3 ) volume fraction of steel fibers. The respective investigation studied on varying the topping flange thickness [18] and considered different numbers of ribs [10]. These studies demonstrated promising performance of the SFRC ribbed slab under bending.…”

“…Samsudin et al [10] also worked on the steel fiber inclusion to replace conventional reinforcement bars in small, scaled concrete ribbed slab profiled panels. The parameters being considered were the number of ribs (two and three ribs) with the same overall thickness of the slab panel including the control slab (without ribs).…”

“…A related research on ribbed slab panels was carried out taking account of the geometry of the ribbed panels and utilized the flow ability of the self-compacting concrete mix [30]. The research focused on the number of ribs provided in a slab section, almost similar to the work done by Samsudin et al [10] with different type of concrete mix. The outcomes demonstrated the ability of 0.5% steel fibers to sustain flexural loadings capacity under three-point bending.…”

Flexural Behaviour of Two Ribbed SFRC Slab Reinforced with GFRP Bars

“…According to clause 3.6.1.3 of BS8110-Part 1 (British Standards Institution, 2004), the rib spacing should not exceed 1.5m centre to centre, and the rib height should not exceed four times the rib width. Samsudin et al (2018) studied two and three-ribbed SFRC slabs. The outcome indicates that the maximum load capacity of a two-ribbed slab is greater than that of a three-ribbed slab, thus a higher strength capacity.…”