The ultimate load carrying capacity of restrained slab is substantially larger than estimated yield line load, which is a well known fact in structural engineering. This load enhancement is attributed to a phenomenon called compressive membrane action (CMA). There have been numerous studies conducted in the past, both experimental and analytical, on the factors that influence the load enhancement caused by CMA, including the percentage of reinforcement, support conditions, shape and aspect ratio of the slab, coefficient of orthotropy of reinforcement, grade of concrete. The study on alkali activated concrete on the deformation behaviour of two-way rectangular slabs with three fixed edges and one edge simply supported is experimentally examined in this research work. A total of ten slabs were casted out of which five were alkali activated concrete (AAC) and five were traditionally vibrated concrete (TVC). The overall dimension of the slab is 1000mmx1500mmx65 mm. All the slabs were tested under sixteen point load using specially fabricated load disperser which is consider to stimulate distributed loading on the slabs. In the experimental examination, the central deflections and crack width at various loading stages, the maximum load carrying capacity, the partial safety factors, and a comparison to theoretical predictions and Indian codal provisions were determined. It is concluded that load enhancement caused by CMA increased with an increase in percentage of slabs and that AAC slabs behaved almost similar to TVC slabs.

Alkali activated concrete slabs, compressive membrane action, load enhancement