Shear strength of recycled aggregate concrete beams containing stirrups

Rahal, Khaldoun N.; Alrefaei, Yazan

doi:10.1016/j.conbuildmat.2018.10.023

Cited by 54 publications

(18 citation statements)

References 19 publications

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“…e properties of RAC have been deeply investigated, and it has been shown that the alternative use of RA generally decreases the mechanical properties [26][27][28][29] and aggravates the durability degeneration of concrete; for example, a significant rise can be noticed for the chloride diffusivity of RAC with an increase in RA content [30,31]. Due to the relatively high water absorption, the effective reuse of recycled fine aggregate (RFA), as well as the RP produced in the production of RA, is a major problem.…”

Section: Introductionmentioning

confidence: 99%

Effects of an Applied Load on the Chloride Penetration of Concrete with Recycled Aggregates and Recycled Powder

Duan

2019

Advances in Civil Engineering

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Recycled aggregate (RA) and recycled powder (RP) are the primary products of the reclamation of construction and demolition (C&D) wastes, and the question of how to use them to prepare recycled aggregate concrete (RAC) and recycled powder concrete (RPC) has been a hot topic in the construction industry in China. As concrete structures are frequently subjected to the effects of both applied loads and chloride attacks, it is necessary to examine their effects on both RAC and RPC, which have received little consideration in previous investigations. In this study, RAC and RPC were firstly prepared by using RA and RP, respectively, to replace natural coarse aggregate and cement by weight. For each type of recycled concrete, sustained load and repeated load tests were then conducted, followed by a chloride diffusion experiment after unloading. The results indicated that the chloride penetration increased with the loading degree as well as the repeated load cycles. As the RP used in this study has high fineness and activity, the chloride penetration of RPC was lower than that of natural concrete, while the opposite result was found in RAC. Besides, the correlation between the chloride diffusivity and the imposed loading damage was also established in this study.

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Section: Introductionmentioning

confidence: 99%

Effects of an Applied Load on the Chloride Penetration of Concrete with Recycled Aggregates and Recycled Powder

Duan

2019

Advances in Civil Engineering

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“…Notwithstanding that high-quality concrete has to go through proper treatments and measures [139], the particle size distribution of RCA needs always to be carefully controlled to balance between fracture resistance and compressive strength of concrete [140]. The mechanical properties of concrete incorporating different percentages of RCA have been studied in details [141][142][143][144][145][146][147][148][149]. Table 6 shows the effect of substitution coarse aggregates for RCA at different substitution ratios.…”

Section: Materials Replacing Aggregatementioning

confidence: 99%

“…In fact, not only does the existence of the paste affect the specific gravity, but it also becomes a foothold for water particles at the surface in addition to the water particles inside the aggregate. This is also the main reason for the reduction of workability in concrete that involves RCA [145,151]. It was concluded that, as the amount of RCA increases in concrete, the workability and mechanical performance of the concrete decreases.…”

Section: Materials Replacing Aggregatementioning

confidence: 99%

Green Concrete: By-Products Utilization and Advanced Approaches

et al. 2019

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The popularity of concrete has been accompanied with dreadful consumptions that have led to huge carbon footprint in our environment. The exhaustion of natural resources is not yet the problem, but also the energy that is needed for the fabrication of the natural materials, in which this process releases significant amount of carbon dioxide (CO2) emissions into the air. Ordinary Portland Cement (OPC) and natural aggregates, which are the key constituents of concrete, are suggested to be recycled or substituted in order to address the sustainability concern. Here, by-products have been targeted to reduce the carbon footprint, including, but not limited to, fly ash, rice husk ash, silica fume, recycled coarse aggregates, ground granular blast-furnace slag, waste glass, and plastic. Moreover, advanced approaches with an emphasis on sustainability are highlighted, which include the enhancement of the hydration process in cement (calcium-silicate hydrate) and the development of new materials that can be used in concrete (e.g. carbon nanotube). This review paper provides a comprehensive discussion upon the utilization of the reviewed materials, as well as the challenges and the knowledge gaps in producing green and sustainable concrete.

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“…Data obtained for other beams indicate that the longitudinal steel didn't reach yielding when failure load was attained. Steel strain measurements are local measurements, hence, they are generally sensitive to the location of the gauge with respect to the nearby concrete cracks (Rahal et al 2018). Figure 6 illustrates the failure modes for the test beams while Figure 7 shows the cracking pattern.…”

Section: Load Vs Deflectionmentioning

confidence: 99%

Effect of longitudinal reinforcement ratio on the shear behavior of RC beams made with recycled aggregates

Khalil¹,

Makhoul²

2019

Sustainable Construction Materials and Technologies (SCMT)

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This paper presents a study into the effect of longitudinal reinforcement ratio on the shear behavior of Recycled Aggregates Concrete beams (RAC). Six beams were cast in two series: first series includes three beams with ρ=1.04% and the second series includes three beams with ρ=1.5%. The first beam of each series was cast with natural coarse aggregates (R0) to serve as control beam. The second beam was made with 50% replacement ratio of coarse aggregates (R50) and the third beam was made entirely with recycled concrete aggregates (R100). The shear span was constant for all beams a/d=3.5. The beams were subjected to four point loading test. Beams' deflection, crack patterns, yielding, ultimate shear capacity; and failure modes are all observed and analyzed. Significant increase in the shear strength was recorded as longitudinal reinforcement ratio increases by 0.5%. ACI Code provisions for predicting the concrete shear capacity tends to become more conservative with increasing ρ.

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Shear strength of recycled aggregate concrete beams containing stirrups

Cited by 54 publications

References 19 publications

Effects of an Applied Load on the Chloride Penetration of Concrete with Recycled Aggregates and Recycled Powder

Effects of an Applied Load on the Chloride Penetration of Concrete with Recycled Aggregates and Recycled Powder

Green Concrete: By-Products Utilization and Advanced Approaches

Effect of longitudinal reinforcement ratio on the shear behavior of RC beams made with recycled aggregates

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