STRUCTURAL BEHAVIOR OF SELF COMPACTING CONCRETE

Research Article:

Jamal Abdul-Samad Khudair, Aqeel Hatem Chkheiwer
Civil Engineering Department, Engineering College, Basrah University, Iraq

E-mail addresses: aqeelcivil@yahoo.com

ABSTRACT

This study investigated the influence of type of concrete (self compacting concrete
(SCC) and normal concrete( NC)) and compressive strength (30, 50 and 62 MPa) on the
flexural and shear behavior of reinforced concrete beams, as well as punching shear of
slabs.To achieve these targets, 18 beams and 6 slabs are equipped, tested and assessed. The
tested beams were divided into threegroups, the first group consists of six beams failed in
flexure, the second group contains six beams without web reinforcement failed in shear with
shear span/depth ratios of 3(slender beams), the third group consists of six beams without
web reinforcement failed in shear with shear span/depth ratio of 1 (deep beams), each group
consisted of three SCC and three NC geometrically similar rectangular beams of different
concrete strengths. Test results indicated that, for beams failing in flexure, SCC beams
showed similar ultimate load to NC beams. For slender beams failing inshear, the ultimate
load for beams with fc‘ of about 32 and 48 MPa, NC beams showed 6.75 % higher ultimate
load compared with SCC beams, but beams with fc‘ of about 62 MPa, SCC and NC beams
showed almost the same ultimate load value.For deep beams, no considerable difference in
ultimate loads for SCCand NC beams was noticed. For the six geometrically similar slabs
(three slabs made with SCC and three slabs made with NC of different concrete strengths)
which were designed to fail in punching shear, it was found that, SCC slabs exhibited 17.25
% higher ultimate punching shear load than NC slabs.

Keywords: self-compacting concrete, structural behavior, flexure , shear ,punching shear

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