Properties of interfacial transition zones (ITZs) in concrete containing recycled mixed aggregate

I.F. Saez del Bosque, Wenzhong Zhu, Torsten Howind, A. Matías, M.I. Sanchez de Rojas, C Medina

Research output: Contribution to journalArticlepeer-review

209 Citations (Scopus)
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Concretes containing mixed recycled aggregate (RA) have a larger number of coarse aggregate/paste interfacial transition zones (ITZs) than conventional concretes, due to the various component materials present in recycled aggregate. This study investigated the properties of various RA/paste ITZs in concrete using nanoindentation and scanning electron microscopy (SEM) and analysed the possible impact of the properties of the ITZs on the macro-mechanical performance of recycled concrete. It was found that the elastic modulus of the ITZ varies with the type of constituent materials present in recycled aggregate, with ITZs associated with organic components (e.g. wood, plastic and asphalt) exhibiting lower minimum elastic modulus values. The impact of ITZ properties on macro-mechanical properties of concrete depends on the relative content of different constituent materials present in the recycled aggregate and the micro-mechanical properties of the ITZs involved.

Original languageEnglish
Pages (from-to)25-34
Number of pages10
JournalCement & Concrete Composites
Early online date3 May 2017
Publication statusPublished - Aug 2017


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