期刊
CEMENT & CONCRETE COMPOSITES
卷 81, 期 -, 页码 25-34出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2017.04.011
关键词
Interfacial transition zone; Recycled aggregate; Elastic modulus; Thickness; Engineering properties
资金
- Spanish Ministry of Science and Innovation [BIA 2013-48876-C3-1-R, BIA 2013-48876-C3-2-R]
- Government of Extremadura
- European Regional Development Fund [GR 15064]
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 117 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. (C) 2017 Elsevier Ltd. All rights reserved.
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