Abstract

In modern construction practice, reducing structural weight without compromising strength has become an important research area. Voided slab systems have emerged as an efficient solution by eliminating unnecessary concrete from the neutral axis of reinforced concrete slabs. One such innovative technology is the bubble deck slab system, which incorporates hollow plastic spheres inside the slab to reduce weight while maintaining structural performance. The present study investigates the structural behavior of a bubble deck slab constructed with high-density polyethylene (HDPE) balls and compares it with a conventional reinforced concrete slab. Both slabs were fabricated using M35 grade concrete and tested under three-point loading conditions. The experimental analysis focused on evaluating load carrying capacity, deflection characteristics, and concrete quality using ultrasonic pulse velocity testing. The results demonstrated that the voided slab achieved significant weight reduction while maintaining satisfactory structural performance. The bubble deck slab utilized approximately 22% less concrete compared to the conventional slab and exhibited comparable load carrying capacity with slightly higher but acceptable deflection values. These findings indicate that bubble deck technology can contribute to sustainable and economical construction by reducing material consumption and structural dead load.