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Mechanical Properties of Concrete with Recycled Concrete Aggregates

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The construction sector generates thousands of tons of construction and demolition waste annually, which encourages us to move towards recycling this waste. In view of obtaining a circular economy, recycled concrete from Morocco has been used as filler. In Morocco only the 5% of construction waste is valued, therefore, the aim of this paper is to show that beyond 5% valued interesting results can be obtained. Because of the growing awareness of the importance of recycling construction and demolition waste in the context of “Sustainable Development", percentages between 5% and 20% of construction waste have been introduced into the concrete replacing the sand. The porosity, the compressive strength and the chloride diffusion of concrete with 0-20 wt% of recycled aggregate have been studied. In the end, it has been concluded that the C20% presents interesting values of these three properties taking into account their current values. The compressive strength increases up to 18%; porosity decreases to 4.2% and chloride diffusion decreases up to 50%. The importance of the recycled aggregates obtained from construction and demolition waste should be considered as a sustainable material which is economic end environmentally.
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Recycled Aggregate; Concrete; Porosity; Chloride Diffusion Coefficient; Compressive Strength

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