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

doi:10.1016/j.cemconcomp.2017.04.011

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

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Abstract

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 language	English
Pages (from-to)	25-34
Number of pages	10
Journal	Cement & Concrete Composites
Volume	81
Early online date	3 May 2017
DOIs	https://doi.org/10.1016/j.cemconcomp.2017.04.011
Publication status	Published - Aug 2017

Keywords

Interfacial transition zone
Recycled aggregate
Elastic modulus
Thickness
Engineering properties

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10.1016/j.cemconcomp.2017.04.011

2017 04 25 Saez del Bosque et al Properties acceptedAccepted author manuscript, 1.25 MBLicence: CC BY-NC-ND

Wenzhong Zhu
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title = "Properties of interfacial transition zones (ITZs) in concrete containing recycled mixed aggregate",

abstract = "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.",

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T1 - Properties of interfacial transition zones (ITZs) in concrete containing recycled mixed aggregate

AU - Saez del Bosque, I.F.

AU - Zhu, Wenzhong

AU - Howind, Torsten

AU - Matías, A.

AU - Sanchez de Rojas, M.I.

AU - Medina, C

N1 - 12 months embargo

PY - 2017/8

Y1 - 2017/8

N2 - 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.

AB - 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.

KW - Interfacial transition zone

KW - Recycled aggregate

KW - Elastic modulus

KW - Thickness

KW - Engineering properties

U2 - 10.1016/j.cemconcomp.2017.04.011

DO - 10.1016/j.cemconcomp.2017.04.011

M3 - Article

SN - 0958-9465

VL - 81

SP - 25

EP - 34

JO - Cement & Concrete Composites

JF - Cement & Concrete Composites

ER -

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

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Keywords

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Wenzhong Zhu

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