Recycled Aggregates Produced from Construction and Demolition Waste for Structural Concrete: Constituents, Properties and Production

Pacheco, João; Brito, Jorge de

doi:10.3390/ma14195748

Cited by 45 publications

(30 citation statements)

References 53 publications

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“…Such a large amount of waste concrete is usually placed in landfills and roadbed backfills and not effectively utilized, which is not only a waste of resources but also greatly damages the environment and goes against the path of sustainable development [ 3 , 4 ]. Therefore, researchers at home and abroad have conducted prospective research on the application of waste concrete in construction [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ], e.g., making recycled aggregates and geopolymers from waste concrete [ 14 , 15 , 16 ]. The geopolymer is a new environmentally friendly material that can replace cement in construction.…”

Section: Introductionmentioning

confidence: 99%

The Durability of Recycled Fine Aggregate Concrete: A Review

Лю

Lü

et al. 2022

Materials

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With the rapid development of urbanization, many new buildings are erected, and old ones are demolished and/or recycled. Thus, the reuse of building materials and improvements in reuse efficiency have become hot research topics. In recent years, scholars around the world have worked on improving recycle aggregates in concrete and broadening the scope of applications of recycled concrete. This paper reviews the findings of research on the effects of recycled fine aggregates (RFAs) on the permeability, drying shrinkage, carbonation, chloride ion penetration, acid resistance, and freeze–thaw resistance of concrete. The results show that the content of old mortar and the quality of recycled concrete are closely related to the durability of prepared RFA concrete. For example, the drying shrinkage value with a 100% RFA replacement rate is twice that of normal concrete, and the depth of carbonation increases by approximately 110%. Moreover, the durability of RFA concrete decreases as the RFA replacement rate and the water–cement ratio improve. Fortunately, the use of zeolite materials such as fly ash, silica fume, and meta kaolin as surface coatings for RFAs or as external admixtures for RFA concrete had a positive effect on durability. Furthermore, the proper mixing methods and/or recycled aggregates with optimized moisture content can further improve the durability of RFA concrete.

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Section: Introductionmentioning

confidence: 99%

The Durability of Recycled Fine Aggregate Concrete: A Review

Лю

Lü

et al. 2022

Materials

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“…Concrete is a widely used material for critical infrastructure worldwide; over 10 billion tons of concrete are produced annually in the modern industrial society [1]. However, the construction industry faces crucial challenges in finding cost-effective strategies to reduce the carbon footprint and embodied energy associated with producing and using concrete and its ingredients [2][3][4]. Amongst the viable solutions, the re-use of construction waste, the so-called recycled concrete aggregates (RCA), has been receiving increased attention in the civil industry [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Likewise, fine recycled concrete aggregates (FRCA) comprise the original virgin aggregate (OVA) and residual cement paste (RCP). The properties of RCA concrete made of CRCA have been extensively investigated [3,[10][11][12][13][14][15][16][17]; therefore, numerous documents such as ACI-555R [18], BS EN 1744-6:2006and BS EN 933-11:2009 along with RILEM technical reports, such as [19,20], provide guidelines and criteria on how to deal with and use CRCA for proportioning RCA concrete. Yet, although RCA's use in concrete has grown over the past years, concerns related to its mechanical properties, durability and long-term behaviour prevent its widespread use for structural purposes [6,9,14,21,22], especially due to the lack of efficient quality control and proportioning procedures.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Mix Proportion and Aggregate Features on the Performance of Eco-Efficient Fine Recycled Concrete Aggregate Mixtures

et al. 2022

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Most of the previous research on recycled concrete aggregates (RCA) has focused on coarse RCA (CRCA), while much less has been accomplished on the use of fine RCA particles (FRCA). Furthermore, most RCA research disregards its unique microstructure, and thus the inferior performance of concrete incorporating RCA is often reported in the fresh and hardened states. To improve the overall behaviour of RCA concrete advanced mix design techniques such as equivalent volume (EV) or particle packing models (PPMs) may be used. However, the efficiency of these procedures to proportion eco-efficient FRCA concrete still requires further investigation. This work evaluates the overall fresh (i.e., slump and rheological characterization) and hardened states (i.e., non-destructive tests, compressive strength and microscopy) performance of sustainable FRCA mixtures proportioned through distinct techniques (i.e., direct replacement, EV and PPMs) and incorporating different types of aggregates (i.e., natural and manufactured sand) and manufacturing processes (i.e., crusher fines and fully ground). Results demonstrate that the aggregate type and crushing process may influence the FRCA particles’ features. Yet, the use of advanced mix design techniques, particularly PPMs, may provide FRCA mixes with quite suitable performance in the fresh (i.e., 49% lower yield stress) and hardened states (i.e., 53% higher compressive strength) along with a low carbon footprint.

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“…However, the high preparation cost of SCC limits its application in engineering. With the advancement of urbanization in China, many old buildings have been demolished and rebuilt, leading to an increase in the use of recycled concrete as a raw material for the sustainable development of the construction industry [2]. Self-compacting concrete with recycled aggregate (RASCC) is formed by replacing all or part of the natural aggregates with recycled aggregate.…”

Section: Introductionmentioning

confidence: 99%

Study on Flexural Behavior of Self-Compacting Concrete Beams with Recycled Aggregates

Wang

Yao

et al. 2022

Buildings

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Currently, numerous studies have focused on the differences in the properties of self-compacting concrete with recycled aggregate (RASCC) and normal concrete (NC), while less attention has been paid to the application of RASCC in reinforced concrete structures. In this paper, four-point bending loading tests were performed on seven RASCC beams and four NC beams, considering the parameter of reinforcement ratio, and the flexural properties were analyzed and compared. The results showed that the failure form, moment–deflection curves, and flexural capacity of the RASCC beams were similar to those of the NC beams. However, the cracking moment and the crack width of the RASCC beams were significantly smaller than that of the NC beams. With an increase in the longitudinal reinforcement ratio, the cracking resistance and flexural capacity of the RASCC beams increased significantly. The cracking moment and flexural capacity could be calculated using the method of the Chinese code GB50010-2010. However, compared with the test values, the predicted deflection was slightly less safe, while the maximum crack width calculation was slightly more conservative. Therefore, the current code formula was revised according to the test results.

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Recycled Aggregates Produced from Construction and Demolition Waste for Structural Concrete: Constituents, Properties and Production

Cited by 45 publications

References 53 publications

The Durability of Recycled Fine Aggregate Concrete: A Review

The Durability of Recycled Fine Aggregate Concrete: A Review

Influence of the Mix Proportion and Aggregate Features on the Performance of Eco-Efficient Fine Recycled Concrete Aggregate Mixtures

Study on Flexural Behavior of Self-Compacting Concrete Beams with Recycled Aggregates

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