Multi-Technique Approach to Enhance the Properties of Fine Recycled Aggregate Concrete

Amadi, Ichebadu George; Beushausen, H.; Alexander, Mark

doi:10.3389/fmats.2022.893852

Cited by 6 publications

(8 citation statements)

References 47 publications

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“…Processes that include the rotor crusher or the ball mill led to reduced absorption because these techniques have a polishing effect that separates the adhered paste from the natural aggregates. Comparing the averages, it can be concluded that the jaw crusher + rotor crusher + sieving process generated FRCAs with [10,12,18,21,32,33,35,38,46,50,52,59,62] and CW [11,16,17,19,[23][24][25]36,42,43,45,47,53,57,87].…”

Section: Figure 2 Water Absorption Of Frcas From Labmentioning

confidence: 99%

“…Furthermore, the figures presented Fuller's Curve, which represents the grading of aggregate particles resulting in optimum packing, density, and strength of the concrete mixture [92]. [14,35,38,44,46,50,52,59,62]; (b) particle size distributions of FRCAs from CW according to recycling processes [11,16,[23][24][25]28,36,42,43,45].…”

Section: Particle Size Distribution (Psd)mentioning

confidence: 99%

“…Figure 2 shows the water absorption of FRCA grouped according to these criteria. [10,12,18,21,32,33,35,38,46,50,52,59,62] and CW [11,16,17,19,[23][24][25]36,42,43,45,47,53,57,87].…”

Section: Water Absorptionmentioning

confidence: 99%

“…The effect of this is an increase in FRCA quality due to a dual effect of reduced absorption and increased oven-dry density. [10,12,[32][33][34][35]38,46,47,50,52,59] and CW [11,16,17,19,[23][24][25]36,42,43,45,53,57,87].…”

Section: Correlation Between Oven-dry Density and Water Absorptionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Recycling Processes on Properties of Fine Recycled Concrete Aggregates (FRCA): An Overview

Sbardelotto,

dos Santos,

Martins

et al. 2024

Waste

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Concrete waste recycling processes involve multiple stages, equipment, and procedures which produce Fine Recycled Concrete Aggregates (FRCA) for use in construction. This research aims at performing a comprehensive overview of the recycling technologies, recycling processes, and normative requirements to produce high-quality FRCA and to investigate the influence of these processes on their physical properties. The properties investigated were the particle size distribution (PSD), water absorption, oven-dry density, and adhered paste. The correlations between these properties were also investigated. The results indicate that the recycling processes with the highest potential for producing high-quality aggregates demand jaw crusher and impact crusher combinations. These processes are better suited for achieving FRCA with the desired particle size distribution and oven-dry density. However, water absorption and adhered paste, which are critical factors for obtaining high-quality FRCA, seem to be more dependent on the original material than on the recycling process.

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Section: Figure 2 Water Absorption Of Frcas From Labmentioning

confidence: 99%

Section: Particle Size Distribution (Psd)mentioning

confidence: 99%

“…Figure 2 shows the water absorption of FRCA grouped according to these criteria. [10,12,18,21,32,33,35,38,46,50,52,59,62] and CW [11,16,17,19,[23][24][25]36,42,43,45,47,53,57,87].…”

Section: Water Absorptionmentioning

confidence: 99%

Section: Correlation Between Oven-dry Density and Water Absorptionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Recycling Processes on Properties of Fine Recycled Concrete Aggregates (FRCA): An Overview

Sbardelotto,

dos Santos,

Martins

et al. 2024

Waste

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show abstract

“…The mechanical performance of recycled fine aggregates, supplemented with waste carbon fibers, indicated that adding waste fibers and recycled fine aggregates to concrete improves the material's characteristics [19]. Utilizing adhered cement paste elimination and fly ash treatment significantly enhanced the compressive strength and elastic modulus of recycled fine aggregates (RFA) concrete during the multi-technique approach in optimizing the properties of RFA concrete [20].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Concrete: Exploring Fresh, Mechanical, Durability, and Microstructural Properties with Recycled Fine Aggregates

Panghal,

Kumar

2024

Period. Polytech. Civil Eng.

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The growing construction industry and global population have led to increased demand for concrete, resulting in increased waste production. Recycling construction and demolition (C&D) waste as recycled fine aggregates (RFA) in concrete could help reduce waste and conserve natural resources. This research delves into the meticulous examination of particle packing density within specific cylindrical volumes under standard compacting efforts, elucidating an order of compressive strength. The study comprehensively explores various concrete properties, including workability, compressive strength, flexural strength, split tensile strength, drying shrinkage, electrical resistivity, rapid chloride penetration, and microstructural characteristics (analyzed through XRD, SEM, and EDAX). RFA particles, ranging from 0.15 to 4.75 mm, were employed as partial replacements for fine aggregates, with replacement percentages varying from 0% to 100% in increments of 25%. The empirical findings underscore that the incorporation of RFA significantly enhances concrete properties. However, it was observed that surpassing the optimum replacement percentage of 25% (RFA 25) adversely impacts the concrete’s strength and microstructure. Specifically, RFA 25 exhibited remarkable improvements, with a 14.75% increase in compressive strength, a 6.61% boost in flexural strength, and a 13.14% enhancement in split tensile strength compared to conventional concrete (RC). Furthermore, RFA 25 demonstrated a 4.16% increment in drying shrinkage, 17.65% higher electrical resistivity, and an 18.83% superior resistance to chloride penetration compared to RC. The analysis of XRD, SEM, and EDAX results elucidated that at lower replacement percentages, the pozzolanic reaction enhances strength by forming additional hydration products. Conversely, at higher replacement levels, strength diminishes.

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Enhancing concrete durability and strength: An innovative approach integrating abrasion and cement slurry treatment for recycled coarse aggregates

Panghal,

Kumar

2024

Structural Concrete

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This study introduces a novel approach to enhance the durability and strength of concrete by integrating abrasion and cement slurry treatments on surface‐treated recycled coarse aggregates (STRCA). Initial abrasion treatment removes aged mortar from the recycled coarse aggregate (RCA) surface, while subsequent cement slurry modification provides a fresh surface, reinforcing the bond with the concrete matrix. Through detailed material analyses including x‐ray diffraction, scanning electron microscopy, and energy‐dispersive x‐ray, microstructural changes are evaluated alongside compressive strength, drying shrinkage, electrical resistivity, and chloride ion penetration of STRCA‐based concrete. Results indicate significant improvements in mechanical properties and durability as the treatments eliminate mortar and enhance the interfacial connection with cement paste. Notably, a substantial 29.37% strength enhancement is observed at 25% replacement (STRCA 25), demonstrating treatment efficacy. While a reduction of 11.58% occurs at 100% replacement (STRCA 100), up to 75% replacement shows minimal strength loss, with optimal enhancements at 50% replacement. Additionally, STRCA concrete exhibits lower drying shrinkage (11%–20% reduction) and increased electrical resistivity (28%–36% rise), indicating improved durability at 100% replacement. Enhanced resistance to chloride ion penetration is also evident, with a 22%–28% increase at 100% replacement compared to conventional RCA. Overall, this study highlights the effectiveness of dual treatments for enhancing concrete properties using STRCA.

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Multi-Technique Approach to Enhance the Properties of Fine Recycled Aggregate Concrete

Cited by 6 publications

References 47 publications

Influence of Recycling Processes on Properties of Fine Recycled Concrete Aggregates (FRCA): An Overview

Influence of Recycling Processes on Properties of Fine Recycled Concrete Aggregates (FRCA): An Overview

Sustainable Concrete: Exploring Fresh, Mechanical, Durability, and Microstructural Properties with Recycled Fine Aggregates

Enhancing concrete durability and strength: An innovative approach integrating abrasion and cement slurry treatment for recycled coarse aggregates

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