Effect Of Concrete Strength And Stirrup Position On Shear Behavior Of Semi Light Weight High Strength Self-Compacting Concrete Beams

Abstract

Self-compacting concrete (SCC) is a new technology of concrete, requiring no consolidation work at site and it can pass through closely spaced reinforcing bars and restricted sections without loss of homogeneity. SCC makes pouring concrete easier and solves construction issues, while lightweight concrete (LWC) is a great way to reduce the dead load on the structure. Combining the benefits of LWC with SCC is a new field of study. This research aims to study the shear behavior of Semi light-weight high strength self-compacting concrete (SLW-HSCC) beams with different concrete strength (𝑓′𝑐 = 55, 65 𝑎𝑛𝑑 75 MPa ) and stirrup positions (without stirrups, stirrups along the shear span and stirrups along the span). To examine the shear behavior, twelve beams manufactured and tested with SLW-HSCC as well as high strength self-compacting concrete (HSCC) to compare them with a constant beam depth, width and (a/d) ratio. The test variables include the concrete strength, concrete type and stirrup positions. In SLW-HSCC beams, the first shear crack was seen to develop at lower loads than in HSCC beams. Stirrups added inside the shear span improved the shear strength of SLW-HSCC beams on average by 117.8%, but stirrups added within the shear span increased the shear strength of HSCC beams by 24.16%. It is critical to investigate the shear behavior of SLW-HSCC in structural members such as beams for the future.

Keywords

• concrete strength
• stirrup position
• shear
• slw-hscc