These kind of slabs are generally seen in Dubai and China. This  slab is constructed by hardy Bricks. Hardy bricks are hollow bricks and made up of concrete Hollow blocks are used to fill portions of the slab thickness it saves the  amount of concrete and hence the own weight of the slab is reduced. This kind of slab has a more thickness when compared with the conventional one. The thickness of hardy slab is 0.27m. The method of installing Hardy slab is different from normal  and it is clearly explained below: This is a one of the types of concrete slabs.

The dimensions of Hardy brick is 40cm x 20cm x 20cm

The process of execution is as follows:

Step 1   : Formwork is arranged and then shutters are fixed on the formwork.
Step 2  : Hardy blocks are placed on the shutter with one brick gap on the entire shutter.
Step 3  : The gaps between the bricks are called as rib. Reinforcement is provided in a form of beam within the gap.
Step 4  : After placing the rib, the plane steel mesh is placed on entire slab area resting on ribs.
Step 5  : Now pouring of concrete is done on slab.

Where to use?

Hardy slab is used where temperatures are very high. To resist the temperature from top the slab thickness is increased. Heat coming from walls are resisted by using special bricks which has thermacol in it. Thermacol is a best insualtor of sunlight.

Advantages:

Reducing slab weight by reducing amount of concrete below neutral axis.
Ease of construction, especially when all beams are hidden beams.
Economic for spans > 5m with moderate live load: hospitals, office and residential buildings.
Improved insulation for sound and heat.
Disadvantages:

If not properly handled, the hollow core ribbed brick units may be damaged during transport.
Not economic for small spans.
Difficult to repair and strengthen
Hardy slabs are further classified into two types:

One way Hardy Slab
Two way Hardy slab