Effect of Surface Modifications of Recycled Concrete Aggregate on Concrete Properties

Junak, Jozef; Sičáková, Alena

doi:10.3390/buildings8010002

Cited by 36 publications

(22 citation statements)

References 32 publications

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“…The shear strength prediction by ACI 318-19 (i.e., Equation ( 2)) is listed in Table 5 column (8). Comparisons of shear strength ratio V test /V c from ACI 318-14 and ACI 318-19 are also shown in column (7) and (9) of Table 5, respectively.…”

Section: Ultimate Concrete Shear Strengthmentioning

confidence: 99%

“…Several studies exist on recycling construction and demolition waste to decrease the consumption demand of natural resources and reduce construction waste [1][2][3][4]. Since the largest source of CDW is concrete, numerous research studies have also examined the use of recycled coarse aggregate (RCA) to produce recycled aggregate concrete (RAC), of which the mechanical properties and durability are typically compared to those of natural coarse aggregate concrete (NAC) [5][6][7][8][9][10][11][12][13]. This is because coarse aggregate is the main concrete component, constituting about 60% to 75% of concrete volume.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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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.

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Section: Ultimate Concrete Shear Strengthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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“…Such inert materials can successfully be used to produce new recycled concrete, and mixed with by-products from the construction sector. These by-products also include recycled concrete [55], ceramic tiles [56], and bricks [57] as well as other industries, such as geo-polymer slurry [58] or fly-ash and blast [59]. The addition of by-products into concrete is a practice that delays by-products from being landfilled; however, the substitution is already limited by the actual amount of available by-products.…”

Section: Strategy 2: Integration Of Scrap Waste and By-products Intmentioning

confidence: 99%

Strategies for Applying the Circular Economy to Prefabricated Buildings

et al. 2018

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In this paper, a circular-economy framework is applied to the prefabricated building sector to explore the environmental advantages of prefabrication in terms of reduction, reusability, adaptability, and recyclability of its components. A qualitative approach is used to revisit the design, construction, and demolition stages of prefabricated buildings; in so doing, the circular-economy framework is applied to foster circular prefabricated modi operandi. Prefabrication of buildings can be divided into four entities: elements and components, panels (or non-volumetric elements), volumetric, and entire modules. Through an analysis of published research on how the circular economy can be applied to different industry sectors and production processes, seven strategies emerged, each of which revealed the potential of improving the circular economy of buildings. The first strategy is reduction of waste through a lean production chain. By reusing the waste, the second strategy investigates the use of by-products in the production of new components. The third strategy focuses on the reuse of replacement parts and components. The fourth strategy is based on design toward adaptability, respectively focusing on reusability of components and adapting components for a second use with a different purpose. Similarly, the fifth strategy considers the implications of designing for disassembly with Building Information Modeling so as to improve the end-of-life deconstruction phase. The sixth strategy focuses on design with attention to recyclability of used material. Finally, the seventh strategy considers the use of tracking technologies with embedded information on components’ geometric and mechanic characteristics as well as their location and life cycle to enable second use after deconstruction. It is demonstrated that prefabricated buildings are key to material savings, waste reduction, reuse of components, and various other forms of optimization for the construction sector. By adopting the identified strategies in prefabricated buildings, a circular economy could be implemented within the construction industry. Finally, seven guidelines were distilled from the review and linked to the identified strategies. Owing to their degree of adaptability and capacity of being disassembled, prefabricated buildings would allow waste reduction and facilitate a second life of components.

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“…Nonetheless, the use of RCA is limited to road construction as sub-base material, owing to its lower strength, higher water absorption and superior porosity compared to NA [5]. While some literature have focused on improving the properties of RCA by chemical or physical enhancement [6][7], others have incorporated additional components, including steel fibers [8][9][10]. However, there is limited literature available on the performance of concrete made with RCA and basalt fibers (BF).…”

Section: Introductionmentioning

confidence: 99%

Early-Age Strength and Workability of Basalt Fiber ReinforcedConcrete Made with Recycled Aggregates – A Pilot Study

Shoaib¹,

El-Hassan²,

El-Aris³

et al. 2020

Proceedings of the 4th International Conference on Civil, Structural and Transportation Engineering (ICCSTE'19)

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Effect of Surface Modifications of Recycled Concrete Aggregate on Concrete Properties

Cited by 36 publications

References 32 publications

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

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

Strategies for Applying the Circular Economy to Prefabricated Buildings

Early-Age Strength and Workability of Basalt Fiber ReinforcedConcrete Made with Recycled Aggregates – A Pilot Study

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