Yes, increasing the thickness of a concrete slab can enhance its load-bearing capacity, but there are several factors to consider.

The weight-bearing capacity of a slab depends not only on its thickness but also on:

1. Material Strength:

• The type of concrete used and its compressive strength directly affect the load-bearing capacity. Higher-strength concrete, combined with additional thickness, can support heavier loads.

2. Reinforcement:

• Adding thickness without increasing the amount of steel reinforcement (rebar) can lead to insufficient support. Proper reinforcement is needed to balance the increased thickness and to handle tension forces.

3. Structural Design:

• While thicker slabs can handle more weight, the overall design of the structure—including the type of load (uniform or point load), the spacing of columns, and the slab's span—must be factored into how much extra load the slab can handle.

4. Deflection:

• A thicker slab also helps reduce deflection (sagging or bending under load), which improves the slab’s performance and durability under heavy loads.

5. Soil and Foundation:

• The underlying soil or foundation must be capable of supporting the additional weight that comes from the thicker slab. Without proper foundation support, the extra thickness could cause settlement or failure of the structure.

Conclusion:

While increasing slab thickness generally improves load-bearing capacity, it should be part of a well-thought-out design that includes proper reinforcement and foundation considerations. Consulting with a structural engineer ensures that the slab is designed to meet both safety and performance requirements.