Complete re-utilization of waste concretes–Valorisation pathways and research needs

Zaccardi, Yury Villagrán; Marsh, Alastair; Sosa, María Eva; Zega, Claudio Javier; Belie, Nele De; Bernal, Susan A.

doi:10.1016/j.resconrec.2021.105955

Cited by 69 publications

(12 citation statements)

References 144 publications

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“…Therefore, the knowledge system on the effects of RCA on concrete is well-established [ 13 , 14 ], and guidelines for the use of RCA have been suggested by several countries [ 8 , 15 , 16 ]. Some researchers pointed out that research on concrete recycling has been relatively limited to RCA [ 17 , 18 ]. RFA as a substitute for river sand and natural fine aggregate (NFA) has received relatively less attention compared to RCA.…”

Section: Introductionmentioning

confidence: 99%

“…Accordingly, several studies have investigated the effectiveness of various supplementary cementitious materials, such as glass powder and fly ash, to decrease cement usage [ 27 , 28 ]. However, RP as a supplementary cementitious material is arguably the least investigated material compared to RCA and RFA [ 18 ]. In the concrete matrix, RP acts as a filler that fills the pores of the concrete and makes it compact, but on the other hand, the low reactivity of RP does not contribute to strength development by forming fewer hydration products, which is the cause of the low performance compared to concrete made of Portland cement.…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on Structural Concrete Containing Recycled Aggregates and Powder from Construction and Demolition Waste

2022

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For complete utilization of construction and demolition (C&D) waste, an investigation of all size fractions of C&D waste generated during the recycling process should be conducted. In this work, the effects of three recycled concrete materials with different sizes (recycled coarse aggregate (RCA) with a size of 4.75–25 mm, recycled fine aggregate (RFA) of 0.15–4.75 mm, and recycled powder (RP) smaller than 0.15 mm) produced from concrete waste on the fresh and hardened mechanical properties of concrete were evaluated. The replacement ratios of natural coarse and fine aggregates by RCA and RFA were 30, 60, and 100%, and those of ordinary Portland cement for RP were 10, 20, and 30%. The results showed that the concrete properties deteriorated with increasing replacement ratio regardless of the type of recycled materials. The properties were reduced in the order of the use of RFA, RCA, and the simultaneous use of RCA and RFA. In addition, concrete with 30% RP showed lower mechanical strength than concrete with 100% RCA and 100% RFA. However, all concretes could be applicable for structural purposes under different environmental exposure conditions. In particular, concretes with 10% RP and 20% RP showed better cost-benefits compared to natural aggregate concrete with 100% ordinary Portland cement. These promising findings provide valuable initiatives for the effective and complete recycling of C&D waste.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Experimental Study on Structural Concrete Containing Recycled Aggregates and Powder from Construction and Demolition Waste

2022

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“…It is necessary to circumvent the challenges associated with the valorization of FRCA by employing innovative valorization technologies to convert waste concrete into secondary high-value raw materials and complete the recycling process [4][5][6][7]. To enhance the properties of FRCA, the inconvenient adhered cement paste of particles [8,9] may be densified by means of carbonation [6].…”

Section: Introductionmentioning

confidence: 99%

Fine Recycled Concrete Aggregates Treated by Means of Wastewater and Carbonation Pretreatment

et al. 2023

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Fine recycled concrete aggregate (FRCA) possesses substantial limitations for its use due to its significant porosity. Extensive research on the effect of carbonation on the accessible porosity of coarse recycled concrete aggregate is available in the literature, but FRCA information is scarce. The present paper presents results of the effect of carbonation on different fractions of FRCA from <0.125 mm to 4 mm previously sprayed with wastewater from mortar production as an additional source of portlandite. The results of water absorption via the electrical conductivity method, TGA, XRD+Rietveld+PONKCS analysis, EDS mapping, and Life Cycle Assessment (LCA) demonstrate that the efficiency of the treatment depends on the particle size range of the FRCA. It was most effective for the extreme size fractions <0.25 mm and >1 mm of FRCA as a result of the relationship between the amount of precipitated calcium carbonate and the initially accessible porosity in each fraction. As a consequence, mortar produced with 30% replacement of natural sand with carbonated FRCA showed no impact on compressive strength.

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“…Recycled concrete gained from end-of-life buildings allows demolished concrete to act as a material resource for new building materials. This valorisation leads to a reduction in raw materials consumption as the concrete is kept in the material loop with regard to a circular economy [1,2].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbonation technique on the performance properties of cRCP in composite cements

Schade,

Zajac,

Shi

et al. 2023

ce papers

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The impact of carbonation technique on the performance properties of carbonated Recycled Concrete Paste (cRCP) in composite cements was investigated. The results show that despite differences in characteristics of carbonated material both techniques, wet and semi‐dry carbonation, lead to a carbonated material with valuable pozzolanic properties. The cement performance was further tested with different types of recycling material. Lab‐produced and industrially separated RCP were treated by means of enforced carbonation. All RCP materials were suitable for using concrete as a CO2 sink to sequester emissions from clinker production. The performance of the tested materials was similar regardless of the carbonation technique. Finally, it could be shown that industrial RCP material enables the production of ecofriendly composite cements for future applications.

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Complete re-utilization of waste concretes–Valorisation pathways and research needs

Cited by 69 publications

References 144 publications

An Experimental Study on Structural Concrete Containing Recycled Aggregates and Powder from Construction and Demolition Waste

An Experimental Study on Structural Concrete Containing Recycled Aggregates and Powder from Construction and Demolition Waste

Fine Recycled Concrete Aggregates Treated by Means of Wastewater and Carbonation Pretreatment

Effect of carbonation technique on the performance properties of cRCP in composite cements

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