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Article

Prediction of Shear Strength of Reinforced Recycled Aggregate Concrete Beams without Stirrups

1
Center of Excellence in Sustainable Disaster Management, School of Engineering and Technology, Walailak University, Nakhonsithammarat 80161, Thailand
2
School of Engineering, The University of Warwick, Coventry CV4 7AL, UK
3
Department of Civil Engineering, Prince of Songkla University, Songkhla 90110, Thailand
*
Authors to whom correspondence should be addressed.
Academic Editor: Pavel Reiterman
Buildings 2021, 11(9), 402; https://doi.org/10.3390/buildings11090402
Received: 4 August 2021 / Revised: 3 September 2021 / Accepted: 6 September 2021 / Published: 8 September 2021
(This article belongs to the Special Issue Advanced Concrete Materials in Construction)
For decades, recycled coarse aggregate (RCA) has been used to make recycled aggregate concrete (RAC). Numerous studies have compared the mechanical properties and durability of recycled aggregate concrete (RAC) to those of natural aggregate concrete (NAC). However, test results on the shear strength of reinforced recycled aggregate concrete beams are still limited and sometimes contradictory. Shear failure is generally brittle and must be prevented. This article studies experimentally and analytically the shear strength of reinforced RAC beams without stirrups. Eight RAC beams and two controlled NAC beams were tested under the four-point flexural test with the shear span-to-effective depth ratio (a/d) of 3.10. The main parameters investigated were the replacement percentage of RCA (0%, 25%, 50%, 75%, and 100%) and longitudinal reinforcement ratio (ρw) of 1.16% and 1.81%. It was found that the normalized shear stresses of RAC beams with ρw = 1.81% at all levels of replacement percentage were quite similar to those of the NAC counterparts. Moreover, the normalized shear stress of the beam with 100% RCA and ρw = 1.16% was only 6% lower than that of the NAC beam. A database of 128 RAC beams without shear reinforcement from literature was analyzed to evaluate the accuracy of the ACI 318-19 shear provisions in predicting the shear strength of the beams. For an RCA replacement ratio of between 50% and 100%, it was proposed to apply a reduction factor of 0.75 to the current ACI code equation to account for the physical variations of RCA, such as replacement percentage, RCA source and quality, density, amount of residual mortar, and physical irregularity. View Full-Text
Keywords: recycled coarse aggregate (RCA); recycled aggregate concrete (RAC); construction waste; shear strength recycled coarse aggregate (RCA); recycled aggregate concrete (RAC); construction waste; shear strength
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MDPI and ACS Style

Setkit, M.; Leelatanon, S.; Imjai, T.; Garcia, R.; Limkatanyu, S. Prediction of Shear Strength of Reinforced Recycled Aggregate Concrete Beams without Stirrups. Buildings 2021, 11, 402. https://doi.org/10.3390/buildings11090402

AMA Style

Setkit M, Leelatanon S, Imjai T, Garcia R, Limkatanyu S. Prediction of Shear Strength of Reinforced Recycled Aggregate Concrete Beams without Stirrups. Buildings. 2021; 11(9):402. https://doi.org/10.3390/buildings11090402

Chicago/Turabian Style

Setkit, Monthian, Satjapan Leelatanon, Thanongsak Imjai, Reyes Garcia, and Suchart Limkatanyu. 2021. "Prediction of Shear Strength of Reinforced Recycled Aggregate Concrete Beams without Stirrups" Buildings 11, no. 9: 402. https://doi.org/10.3390/buildings11090402

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