Abstract
ABSTRACT In comparison with vibrated concrete (VC) of the same strength class, self-compacting concrete (SCC) typically has a lower coarse aggregate content and, eventually, a smaller maximum aggregate size. This may reduce the aggregate interlock between the fracture surfaces in SCC. Since the aggregate interlock plays an important role in the shear strength of slender beams, SCC beams may have a shear strength lower than that of similar VC beams. This article summarizes experimental studies on the shear strength of reinforced SCC slender beams without and with shear reinforcement. The shear strengths of SCC beams are compared with the ones of VC beams and also to the calculated ones according to different code procedures. It is shown that powder-type SCC beams tend to have lower shear strength than similar VC beams and that the difference depends upon the concretes composition and the characteristics of the beams.
Highlights
The use of self-compacting concrete (SCC) is progressively increasing, especially in the precast industry, and a large amount of research has been done on the fresh and hardened properties of SCC, but relatively little research has been carried out on the structural behaviour of SCC
Since the aggregate interlock plays an important role in the shear strength of slender beams, SCC beams may have a shear strength lower than that of similar vibrated concrete (VC) beams
The shear strengths of SCC beams are compared with the ones of VC beams and to the calculated ones according to different code procedures
Summary
The use of SCC is progressively increasing, especially in the precast industry, and a large amount of research has been done on the fresh and hardened properties of SCC, but relatively little research has been carried out on the structural behaviour of SCC. Members with a higher longitudinal reinforcement ratio have a higher shear capacity, which can be attributed to a combination of additional dowel action (if there is no yielding) and smaller crack widths, that result in an aggregate interlock increase and a larger concrete compression zone. This paper analyses a database for beams tested by different authors who investigated the shear strength of SCC slender beams (shear span to effective depth ratio a/d ≥ 2.5) with no axial force. Some of those authors tested only SCC beams [10, 11, 12] while the others [13 - 21], for the sake of comparison, tested SCC and VC beams and these VC beams are included in the analysis. The shear strengths of SCC and VC beams are compared and the experimental shear strengths of the beams, Vu, are compared with the ones calculated, VR, using the provisions of ABNT NBR 6118:2014 [22], ACI 318:2014 [8], EN 1992-1-1:2004 [23] and FIB MC 2010 [7]
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