Evaluation of attached mortar on recycled concrete aggregates by hyperspectral imaging

Bonifazi, Giuseppe; Palmieri, Roberta; Serranti, Silvia

doi:10.1016/j.conbuildmat.2018.03.048

Cited by 51 publications

(16 citation statements)

References 35 publications

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“…The main difference between natural and recycled aggregates is the presence of mortar attached to the surface of RCAs, which strongly affects quality, especially when they are reused for making new concrete [7].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Berredjem

Arabi

Molez

2020

Construction and Building Materials

102

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: Introductionmentioning

confidence: 99%

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Berredjem

Arabi

Molez

2020

Construction and Building Materials

102

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“…In recent years, the use of NIR-HSI has grown rapidly in many sectors, including the solid waste sector . In literature, different HSI-based approaches are proposed for plastic recycling (Ulrici et al, 2013;Bonifazi et al, 2015), construction and demolition waste recycling (Palmieri et al, 2014;Serranti et al, 2015;Bonifazi et al, 2015;Bonifazi et al, 2017;Bonifazi et al, 2018c) and WEEE recycling (Palmieri et al, 2014;Bonifazi et al 2018b).…”

Section: Hyperspectral Imagingmentioning

confidence: 99%

Hierarchical modelling for recycling-oriented classification of shredded spent flat monitor products based on HyperSpectral Imaging

et al. 2020

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The number of flat monitors from televisions, notebooks and tablets has increased dramatically in recent years, thus resulting in a corresponding rise in Waste from Electrical and Electronic Equipment (WEEE). This fact is linked to the production of new high-performance electronic devices. Taking into account a future volume growth trend of WEEE, the implementation of adequate recycling architectures embedding recognition/classification logics to handle the collected WEEE physical-chemical attributes, is thus necessary. These integrated hardware and software architectures should be efficient, reliable, low cost, and capable of performing detection/control actions to assess: i) WEEE composition and ii) physical-chemical attributes of the resulting recovered flow streams. This information is fundamental in setting up and implementing appropriate recycling actions. In this study, a hierarchical classification modelling approach, based on Near InfraRed (NIR) - Hyperspectral Imaging (HSI), was carried out. More in detail, a 3-step hierarchical modelling procedure was designed, implemented and set up in order to recognize different materials present in a specific WEEE stream: End-of-Life (EoL) shredded monitors and flat screens. By adopting the proposed approach, different categories are correctly recognized. The results obtained showed how the proposed approach not only allows the set up of a “one shot” quality control system, but also contributes towards improving the sorting process.

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“…Some standards already include specifications for the use of the coarse aggregate fraction, for example, the Spanish standard EHE-08 [52], which allows the substitution of CRCA in concrete with up to 20% replacement. Nonetheless, when FRCA is present as a larger volume in the mix, the concrete and mortar efficiency and properties are diminished [21,22,53]. This is due to the presence of greater internal porosity, greater deformability, and greater water absorption of FRCA [20,54,55].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mechanical Characteristics of Cement Mortar with Fine Recycled Concrete Aggregates (FRCA)

et al. 2021

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One of the growing demands in concrete manufacture is the availability of natural fine aggregates, which account for 35% to 45% of the total concrete. An alternative method of disposal of fine recycled concrete aggregates (FRCA) generated from demolition and construction waste (C&DW) is their usage in mortar and the development of recycled mortar. The main aim of this research work is to evaluate the viability of incorporating FRCA from urban C&DW for the manufacture of cement-based mortars. Simple processing techniques like washing and sieving are adopted to improve the FRCA quality. Physical and chemical characterization of ingredients is carried out. In total four mixes of 1:3 (cement: sand) mortar with partial replacement of normalized sand with FRCA (0%, 25%, 50%, and 100%) are evaluated for mechanical properties. Water to cement ratio for all four mortar mixes are determined by fixed consistency. Mechanical and physical properties like density, compressive strength, and flexural strength are studied for various curing periods, and the result is that the optimum usage of FRCA is 25% based on a 90-day curing period.

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Evaluation of attached mortar on recycled concrete aggregates by hyperspectral imaging

Cited by 51 publications

References 35 publications

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Mechanical and durability properties of concrete based on recycled coarse and fine aggregates produced from demolished concrete

Hierarchical modelling for recycling-oriented classification of shredded spent flat monitor products based on HyperSpectral Imaging

Evaluation of Mechanical Characteristics of Cement Mortar with Fine Recycled Concrete Aggregates (FRCA)

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