New replacement concrete flooring slab developed

A new composite floor slab that should bring significant advantages has been created and is now undergoing tests.

The commonly used concrete flooring slabs in prefabricated buildings have issues of collisions between the overhanging reinforcement bars, and this reduces construction efficiency. To address this, a new composite floor slab design with split joints has been developed that has bent reinforcement centralised in the middle of the joints to minimise interference. This reduces the contact and potential collision with the reserved steel bars in other prefabricated components, improving construction efficiency. The ends of the bottom plate are not reinforced, further minimising interference with other structural elements during assembly.

Researchers at the School of Engineering, Hangzhou University, China have tested the new slabs. These tests included finite element analysis and theoretical calculations to evaluate the new slab’s ultimate load-bearing capacity, elastoplastic behaviour, and reinforcements.

The results of these tests show that the new design has improved structural integrity, enhanced crack resistance, and higher load-carrying capacity compared to standard concrete flooring slabs.

The researchers concluded that the new design of composite flooring slabs has significant advantages over traditionally constructed slabs. They have high load-bearing capacity, reduce the use of reinforcements, and minimise waste. The slabs are safe to use in modern construction projects, but in order for them to be widely adopted, the researchers note that there needs to be changes in design codes, particularly in crack control specifications.

Before these new slabs are widely used in buildings, the researchers say that future research is needed to assess their long-term performance and durability under cyclic loading.