Structural Performance of Fibrous Reinforced Concrete One-way Bubbled Slabs

Abstract

Abstract A reinforced concrete slab with plastic voids (Bubbled-Deck system) is a form of a slab with a two-dimensional configuration of voids designed to reduce the slab's self-weight while keeping about the same load-bearing capability as solid slabs. Plastic voided slabs may decrease the quantity of concrete by 35%, which is crucial in terms of cost savings and structural performance improvement. This study experimentally examines the strength and behavior of bubbled reinforced concrete one-way slabs. The experimental program evaluates eleven one-way slabs with (1760×420×125mm) diminution; one solid slab (without balls and fibers), and one bubble slab (with spherical balls but without fibers), which is used as a reference.; the other nine slabs are fibrous bubbling slabs (with a spherical ball and fibers), and these nine slabs are divided into three groups based on fiber types (steel fiber bubble slabs, polypropylene fiber bubble slabs, and chopped carbon bubble slabs). The experimental study includes the following parameters: the types of fibers and the percentage of each type, the experimental findings showed that basic bubbled slabs containing spherical ball had 90% of the ultimate load of solid slab and for steel fiber bubble slabs the increase in ultimate load capacity was (14.5 to 25.2 %) compared to solid slab and (26.8 to 39.8 %) compared to basic bubble slab , for polypropylene fiber bubble slabs the increase ultimate load capacity was (12.8 to 20.64 %) compared to solid slab and (25 to 33.6%) compared to basic bubble slab , for chopped carbon fiber bubble slabs the ultimate load result showed a II variation (13.15 to -6 %) compared to solid slab and (25.3 to 4 %) compared to bubble slab in addition, the first crack load result showed a reduction for basic bubble slab compared with sold slab by (15.4%); for steel fiber bubble slabs first crack load increase by (38.46 to 84.6 %) compared to solid slab and (63.3 to 118.1 %) compared to basic bubble slab , for polypropylene fiber bubble slabs first crack load increase by (13 to 30.7 %) compared to solid slab and (33.6 to 54.4%) compared to basic bubble slab , for chopped carbon bubble slabs first crack result showed a variation (13.15 to -6 %) compared to solid slab and (34.5 to 7.3 %) compared to basic bubble slab in addition the type of failure had been changed form shear failure in bubble slab to flexural failure for all fibrous bubble slabs.