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Title: Assessment of Punching Shear of Flat Slabs Using Ground Slag

Author(s): Shahab Samad, Attaullah Shah, and Mukesh C. Limbachiya

Publication: Materials Journal

Volume: 115

Issue: 3

Appears on pages(s): 459-469

Keywords: flat slab; ground-granulated blast-furnace slag (GGBS); punching shear

DOI: 10.14359/51702012

Date: 5/1/2018

Limited research work exists on assessment of punching shear of reinforced concrete (RC) flat slabs made with blended cement incorporating ground-granulated blast-furnace slag (GGBS). This research is aimed at analyzing the punching shear strength of RC flat slabs cast from blended cement having GGBS in different proportions as partial replacement of cement. Four flat slabs supported on the ends were tested under column load such that one flat slab was cast from normal concrete with no GGBS and the remaining three flat slabs were cast with 30, 40, and 50% replacement of cement by GGBS. Experimental punching shear, midspan deflections, strain in the steel bars, and cracking pattern of the slabs were determined. The results of punching shear of flat slabs from the tests were compared with the nominal punching shear capacities proposed by BS 8110, BS EN1992-1-1/EC2, and ACI 318. The provisions of these building codes for the punching shear were observed as safe and conservative for the RC flat slab made from blended cement incorporating GGBS.