Abstract
The influence of the local micro-properties of the interfacial transition zone (ITZ) on macro-properties on the behaviour concretes is studied for recycled concretes made with 20% and 25% recycled ceramic aggregate from sanitary ware waste. This study carried out using nanoindentation and SEM technique aims to explore interface thickness and variations in its elastic modulus. The results show that the minimum and mean values of the elastic modulus and the ITZ thickness impact concrete mechanical and elastic properties to different degrees. Finally, that nanoindentation provides an indispensable tool for studying and assessing the effect of new materials (e.g. recycled aggregates) on the micromechanical properties of the interfacial transition zone (ITZ) and its effect on engineering properties (compressive and splitting tensile strength and modulus of elasticity) of these new concretes.
Highlights
The industrial and economic growth observed in more economically developed countries in recent years has brought with it a considerable increase in the generation of wastes
The different values obtained between natural aggregate and ceramic aggregate by elastic modulus are due to different mineralogy of these materials, because aluminosilicates have lesser value (80–90 GPa) than quartz
A number of conclusions about the use of nanoindentation in the research of the interfacial transition zone between recycled ceramic aggregate/paste in recycled concrete can be drawn from this study: 1. The general distribution pattern of the elastic modulus in both recycled ceramic/paste and natural aggregate/paste interfacial zone is as expected, and similar to those reported previously
Summary
The industrial and economic growth observed in more economically developed countries in recent years has brought with it a considerable increase in the generation of wastes. Sustainability performance of the society is an indispensable aspect in attaining the goal of sustainable development (Shen et al 2007). There are intensive investigations carried out in order to utilize the different wastes (construction and demolition wastes, ceramic materials, asphalt, tyres, etc.) in the manufacture of new cements and concretes (Mačiulaitis et al 2009; Kavussi et al 2011). Concrete is usually considered as a heterogeneous material consisting of three main phases: aggregates, cement paste and the interfacial transition zone (ITZ) between aggregate/paste. All concrete properties are related to the characteristics of these three phases. An understanding of the inter-relationships between concrete composition, structure and properties depends largely on the knowledge of both the paste and the paste/ aggregate interface
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