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Erschienen in:
2013 | OriginalPaper | Buchkapitel
6. Quality Assurance of Recycled Aggregates
verfasst von : Pilar Alaejos, Marta Sánchez de Juan, Jorge Rueda, Roberto Drummond, Ignacio Valero
Erschienen in: Progress of Recycling in the Built Environment
Verlag: Springer Netherlands
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Abstract
Recycled aggregates differ from the natural ones in several properties, making their quality lower in general, but suitable enough to be used in different applications inside the construction field in many cases.
On the other hand, recycled aggregates are quite more heterogeneous compared to natural ones, varying their characteristics along the production process. Therefore, quality assurance is extremely important in order to provide users enough confidence in the material, having properties satisfying requirements, and also with defined tolerances on variation throughout a delivery.
Main factors affecting the quality of recycled aggregates are described in this chapter: influence of the production process, types of treatments, Impurities content, quality of the original debris. The composition and the nature of its components as well as the presence of impurities are the principal parameters affecting the final quality of the recycled aggregates. However, some specific methods and operations may be taken into account during the production process in order to obtain suitable recycled aggregate for use in higher-value applications. The control of the incoming deliveries to the recycling plant is also a basic measure to avoid an excessive heterogeneity in recycled aggregates.
In several countries, the standards have been amended in order to cover specific aspects of recycled aggregates, and even some certification systems have been also developed. Different international standards on quality assurance of recycled aggregates are reviewed in this chapter.