Effect of Coarse Aggregate Size on Shear Behavior of Self-Compacting Concrete and Conventional Concrete Beams

Abstract

This research presents an experimental study to investigate the effect of coarse aggregate maximum size on the shear behavior of self-compacting concrete (SCC) and conventional concrete (CC) slender beams having the same compressive strength and make a comparison between the shear behavior of concrete beams. The experimental program included casting and testing eight beams with a constant size of 150mm height ×125mm width×1000mm length. Two coarse aggregate maximum sizes were used (10mm and 20mm) with SCC and CC in normal and high strength concrete. The results showed that increasing the coarse aggregate maximum size from 10mm to 20mm results in a slight increase in the diagonal cracking load and ultimate shear strength of SCC beams, while for CC beams the result was more significant. Also, it was found that the effect of increasing the coarse aggregate maximum size was more significant for normal strength as compared with high strength beams for both concrete types. Furthermore, the comparison between the shear behavior of SCC and CC beams having the same compressive strength and a concrete with the same coarse aggregate maximum size revealed that the SCC exhibited less diagonal cracking load and less ultimate strength compared with CC.

Numerical Study of the Effect of Maximum Aggregate Size on the Ultimate Strength of Pre-tensioned Prestressed Concrete Beam

“…A linear regression shows the relationship between the ultimate load and the maximum aggregate size with a coefficient of determination R 2 = 0.81. Although the relationship is positive, the increase in the ultimate loads due to a larger maximum aggregate size was slight, as found by Ismael et al [14]. This is attributed to the failure mode, which was not shear, owing to the minimal shear reinforcement.…”

“…When visible concrete cracks appeared, the loading increment was reduced to 22.25 kN till failure. The strands were initially tensioned to 70% of the ultimate stress specified [14]. The theoretical and measured losses in the strand are shown in Table 1.…”

“…A 20 percent increase in mean shear strength was observed between beams with a maximum aggregate size of 19 mm (3/8 inch) and 25.4 mm (1 inch). Ismael et al [14] evaluated eight reinforced concrete beams with selfcompacting concrete and conventional concrete using different aggregate sizes (10 mm and 20 mm). The results showed that increasing the coarse aggregate maximum size increases the diagonal cracking load and ultimate shear strength of self-compacting concrete beams slightly, but the effect was more significant for conventional concrete beams.…”

Behavior of reinforced concrete beams under different angled cold joints at shear zone

“…It has been concluded that as the difference between the compressive strength of the materials in the beams increases, the load-carrying capacity decreases more. In the study examining the effect of cold joint on the performance of reinforced concrete self-compacting thin concrete beams, test results showed that the effect of cold joint on the ultimate load is more important than the first crack load (Ismael et al, 2019). Rathi and Kolase (2019) investigated the effect of cold joints on concrete strength.…”