Author(s): Anette Mueller
Book Title: III Progress of Recycling in the Built Environment
Editor: I. Martins, C. Ulsen and S. C. Angulo
e-ISBN: 978-2-35158-158-2
Publisher: RILEM Publications SARL
Publication year: 2015
Pages: 244-276
Total Pages: 33
Language: English

Abstract: Recycled aggregates are mixtures of various materials that can occur either in bound or liberated form. Thus, the first characterization step is to extract a representative sample. Various properties must be determined depending on the intended recycling paths.

If processed rubble is to be used as a course material in road construction or as recycled concrete aggregate, characterization must be carried out in accordance with certain German and European standards. Material composition, particle size distribution and shape, resistance against abrasion and freeze-thaw cycles must be determined, as well as the concentration of sulfates, chlorides, certain heavy metals and PAHs present in the eluate. For recycled concrete aggregates, particle density and water absorption must also be measured. This paper provides information about the sample mass required to determine the composition of the material by manual sorting. Results taken from test reports of recycling companies are given for the most significant properties.

A more sophisticated characterization is necessary to get a better understanding of the effects of recycled concrete aggregates on concrete production and performance. Material composition, which varies between pure cement paste and pure aggregate, reactivity and chemical and mineralogical compositions must be analyzed in detail. Considerations of the composition are also the basis to develop new recycling paths.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00

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