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Recycled Aggregates Ra

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Introduction of recycled aggregates

Recycled Aggregates are obtained when screening the demolished concretes. When concrete is mixed with a certain percentage of these recycled aggregates, it is then called “Recycled Concrete” (R.Dalati, 2008).
The concept of sustainable construction development is becoming nowadays a widely discussed subject. It is also turning to become a challenge for the construction industry due to the increasing scarcity of natural resources and the ever increasing demolition and construction waste (Wai et al 2012). The essence of sustainable construction development can be given out as the possibility of meeting current needs taking into account the needs of future generations (Valeria et al 2009).
Recently, the amount of waste incurred due to demolition and construction has been increasing because of demographic factors, more specifically: increase in population and urbanization. Therefore, the majority of the developed or emerging economies are facing the problem of handling and disposing such wastes. Considering this aspect, the utilization of these wastes and byproducts is gaining momentum and is highly regarded as an emerging necessity. This idea not only focuses on utilizing the wastes, but also has indirect benefits such as saving energy and protecting the environment.
According to Mehta (2002 data) the global concrete industry consumes “close to 10 billion tons of aggregates, and produces over 1 billion tons of construction and demolition waste annually”. Aggregates constitute approximately 70% of concrete volume, thus the ability to utilize their waste and reuse them in the production of recycled concrete would have a huge positive impact on the environment. However, one of the reasons that this utilization is not widely common is the misconception that is related to aggregates as they are seen as inferior aggregates (ICJ...

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