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

被引：222
|
作者：
Saez del Bosque, I. F. [1 ]
Zhu, W. [2 ]
Howind, T. [2 ]
Matias, A. [1 ]
Sanchez de Rojas, M. I. [3 ]
Medina, C. [1 ]
机构：
[1] Univ Extremadura, Sch Engn, UEX CSIC Partnering Unit, Caceres 10003, Spain
[2] Univ West Scotland, Sch Engn & Comp, Paisley Campus, Paisley PA1 2BE, Renfrew, Scotland
[3] Eduardo Torroja Inst Construct Sci, Madrid 28033, Spain
来源：
CEMENT & CONCRETE COMPOSITES | 2017年 / 81卷
关键词：
Interfacial transition zone; Recycled aggregate; Elastic modulus; Thickness; Engineering properties; CERAMIC SANITARY WARE; MECHANICAL-PROPERTIES; ELASTIC-MODULUS; CEMENT PASTE; NANOINDENTATION; MICROSTRUCTURE; ASPHALT; INDENTATION; STRENGTH; BEHAVIOR;
D O I：
10.1016/j.cemconcomp.2017.04.011
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
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.
引用
收藏
页码：25 / 34
页数：10
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