Experimental Study on the Structural Behavior of Cast in-situ Hollow Core Concrete Slabs

Abstract

An experimental work has been carried out to study the flexural behavior of cast in-situ hollow core reinforced concrete (HCRC) slabs constructed by using easy, cost effective and implementable techniques in field. The precast elements made of different easily available affordable material i.e. concrete, polyvinyl chloride (PVC) and plaster of paris having voided cross- sections of circular, rectangular and triangular shapes were incorporated in one direction during pouring of concrete with minimum flexural reinforcement to construct HCRC slabs. A total of 14 slab specimens including 02 specimens per specification were tested with third point loading for the assessment of flexural behavior as per ASTM standards C78/C78M. The flexural behavior of HCRC slabs with polyvinyl and plaster of paris elements having hollow cross-sections was comparable with the control solid slabs, however, HCRC slab with concrete pipes showed 7 to 8 percent reduction in flexural strength with 19 to 20 percent reduction in self-weight. All the tested specimens performed well in shear as no shear failure was observed. This study reveals that HCRC slabs with locally available material having hollow cross section elements can be used for the construction of cast in-situ monolithic construction of one-way slabs with ordinary construction techniques. Doi: 10.28991/cej-2020-03091597 Full Text: PDF

Flexural behavior of two-layer reinforced concrete slab with hollow cores

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Flexural Ductility, Stiffness, and Toughness of New Voided Reinforced Concrete One-Way Slab Using Waste Plastic Bottles

“…Furthermore, voids can be used as a service path for mechanical and electrical work. Di erent con gurations have been formulated to produce voids inside the concrete structural elements such as bubbles [5][6][7][8][9][10][11][12] and pipes [13][14][15]. However, these methods of voids are almost expensive and required complicated formwork to install.…”

Structural behavior of Lightweight and High strength Layered Hollow Core Slabs

“…There are many advantages of using HCS, like reducing overall weight, saving cost and time of construction, providing long spans, and increasing fire resistance [5][6][7][8]. The shear span to effective depth (a/d) ratio affects the mode of failure of the HCS and changes it from a flexural to a shear mode [9]. The ultimate load decreases with increasing the deflection when increasing the A ratio of (a/d) [10].…”