Flexural and Shear Behaviors of Reinforced Alkali-Activated Slag Concrete Beams

Abstract

The material properties of cement-zero concrete using alkali-activators have been studied extensively as the latest response to reduce the CO 2 exhaust of the cement industry. However, it is also critical to evaluate the behavior of reinforced concrete beams made of alkali-activated slag (AAS) concrete in terms of flexure and shear to promote the applicability of AAS concrete as structural material. Accordingly, nine types of beam specimens with various ratios of tensile steel and stirrup were fabricated and subject to bending and shear tests. The results show that the flexural and shear behaviors of the reinforced AAS concrete members are practically similar to those made of normal concrete and indicate the applicability of the conventional design code given that the lower density of slag is considered. In addition, a framework using the elastic modulus and stress-strain relation from earlier research is adopted to carry out nonlinear finite element analysis reflecting the material properties of AAS concrete. The numerical results exhibit good agreement with the experimental results and demonstrate the validity of the analytical model.

Shear Behavior of Geopolymer Concrete Slender Beams

“…The tested beams are shown in Figures 3-6. Sinik and Arsalan, [56] and Lee et al [41] reported similar cracking patterns and failure mechanisms of slender OPC and GPC beams. Deng et al [36] reported that inclined cracking load in slender OPC beams was at about 62-79% of 𝑃 𝑢 .…”

“…ACI 318-14 [40], ACI 318-19 [42], JSCE-07 [44], and fib-10 [45] underestimated the V c by 71%, 74%, 64% and 79%, respectively. Lee et al [41] investigated GPC beams having a/d ratio 3. ACI 318-14 [40], ACI 318-19 [42], JSCE-07 [44], and fib-10 [45] underestimated the V c by 6-31%, 21-34%, 30-46% and 43-47%, respectively.…”

“…Darmawan et al [39] reported that ACI 318-14 [40] underestimated the shear resistance of FA-based ambient cured GPC beams having an a/d ratio of 2.98 by 25%. Lee et al [41] found that ACI 318-14 [40] underestimated the shear resistance of slag-based ambient cured GPC beams having a/d ratio 3 by about 27%. Wu et al [28] reported that ACI 318- 19 [42], also underestimated the shear resistance of FA with slag-based GPC beams having a/d ratios of 1.5, 2.5 and 4.0 by about 28%.…”

Recent progress in low-carbon binders

“…Analysis of the stress-strain characteristics of AAM concretes has tended to show that these materials show a higher tensile strength, lower modulus of elasticity, and lower Poisson's ratio than conventional Portland cement concretes, as reported by e.g. [133][134][135] and many others.…”

Flexural Rigidity in Concrete Beam by using the Crimped Steel Fibers with Rapid Hardening Admixtures

“…The mechanical properties of the concrete as such as bending stress of fibre reinforced concrete which improves with an increase in the percentages of steel fibre. The steel fibres prevent the early deforming of the beams and increase the durability of the structure [9][10][11][12]. The NDT methods for measuring the strength of a structure are not accurate but can help in correlating the values which can help in estimating the strength of the structure and also useful for analyzing the concrete characteristics and its homogeneity.…”